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Combining or distributing information via frequency channels

Subclass of:

370 - Multiplex communications

370464000 - COMMUNICATION TECHNIQUES FOR INFORMATION CARRIED IN PLURAL CHANNELS

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
370485000 Subscriber carrier 15
370493000 Combined voice and data transmission 6
370497000 Using particular filtering technique 5
20090147805MULTIPLEXING CIRCUIT AND DESIGNING METHOD THEREFOR - The present invention includes two or more bandpass filters, for passing signals of mutually different frequency bands therethrough, including one or more stages of units having coupling devices and resonance circuits coupled, in a tap type, to the coupling device, one end of each bandpass filter is directly connected to a common port, the coupling device and the resonance circuit of the first stage nearest to the port of each bandpass filter has a function of impedance matching means for each bandpass filter, in addition to a function of resonance means, respectively.06-11-2009
20090304031DIGITAL SIGNAL DEMULTIPLEXING DEVICE AND MULTIPLEXING DEVICE - A digital signal demultiplexing apparatus for demultiplexing a received signal including a plurality of signals that are frequency-multiplexed to output demultiplexed signals is disclosed. The digital signal demultiplexing apparatus includes: demultiplexing filter bank means including a configuration in which unit demultiplexing filter banks are connected in a multistage manner, each unit demultiplexing filter bank including one or more filters for filtering an input signal and a down-sampler for down-sampling an output signal of each filter to output an down-sampled signal; and frequency conversion and decimator means configured to receive at least one of the received signal and output signals of each unit demultiplexing filter bank. The frequency conversion and decimator means includes frequency conversion means, for each input signal, configured to shift a frequency of an input signal and output a shifted signal, and one or more decimator means serially connected to an output of each frequency conversion means, and the decimator means includes a filter for performing band limitation of an input signal and a down-sampler for down-sampling an output signal of the filter and output a down-sampled signal.12-10-2009
20090323724FREQUENCY COMBINER SYSTEM AND RELATED METHODS - A combiner system for frequency combining and related methods. Implementations may include a plurality of combiner stages each including a deinterleaver, at least one filter, a frequency downconverter, and a frequency upconverter all operatively coupled together. Each of the plurality of combiner stages may be adapted to receive a complex interleaved input signal including two or more input signals each including a bandwidth, to output a complex stage output signal including the two or more input signals, and to alternately place the bandwidth of each of the two or more input signals in an upper portion and in a lower portion of an output bandwidth of the complex stage output signal. The upper portion and lower portion of the output bandwidth may be contiguous within the output bandwidth and joined at a center of the output bandwidth.12-31-2009
20110110385Front-end system for processing composite wideband signals and method for utilizing same - According to one exemplary embodiment, a front-end system for processing a composite wideband signal comprises a pre-receiving unit including a multiplexer for separating the composite wideband signal into a plurality of filtered signals. The front-end system further comprises a plurality of discrete frequency band outputs corresponding to the plurality of filtered signals, and a tuner/down-converter coupled to at least one of the plurality of discrete frequency band outputs. In one embodiment, the pre-receiving unit of the front-end system further comprises a second multiplexer for separating at least one of the plurality of filtered signals into a second plurality of filtered signals. In one embodiment, the pre-receiving unit may further comprise a low noise amplifier for processing at least one of the plurality of filtered signals before it is input to the second multiplexer.05-12-2011
20120093176METHODS FOR TRANSMITTING AND RECEIVING A MULTICARRIER SIGNAL IMPLEMENTING PROTOTYPE FILTERS, CORRESPONDING DEVICES FOR TRANSMITTING AND RECEIVING, SIGNAL AND COMPUTER PROGRAM - A method is provided for transmitting a multicarrier signal formed by a temporal succession of multicarrier symbols, which includes: at least one preamble formed by at least three successive multicarrier symbols, known as preamble symbols, including complex-value data elements each associated with a carrier of the signal; and multicarrier symbols, known as data symbols, including real-value data elements each associated with a carrier of the signal. The method includes a carrier-shaping step including filtering the carriers of the preamble symbols using a first prototype filter, and filtering the carriers of the data symbols using a second prototype filter different from the first prototype filter.04-19-2012
370491000 Pilot 4
20090003385TX EVM IMPROVEMENT OF OFDM COMMUNICATION SYSTEM - In a wireless communication method and system, a data/pilot constellation is modulated and generated based on input information bits. Channel estimation (CE) sequence in frequency-domain is off-line generated. The frequency-domain channel estimation sequence is transformed into a time-domain channel estimation sequence by ideal IFFT to avoid IFFT (Inverse Fast Fourier Transform) impact to EVM (Error Vector Magnitude) performance. Off-line resealing the time-domain CE sequence, multiplied by a rescaling coefficient, in time-domain improves EVM performance. Further, the time-domain channel estimation sequence is off-line quantized.01-01-2009
20090052470METHOD FOR TRANSMITTING PILOT FOR MULTIPLE CARRIER SYSTEM - A method of transmitting pilot signals in a system which performs communication using two or more earners comprises transmitting first pilots and second pilots from at least one user equipment to a base station, the first and second pilots, which are transmitted from the at least one user equipment, being multiplexed by code division multiplexing, and the first and second pilots, which are transmitted from a specific user equipment, having different transmission powers, and transmitting data from the at least one user equipment to the base station depending on the first pilots and the second pilots. Since many UEs can transmit CQ pilots, exact channel estimation can be performed and thus communication efficiency can be improved.02-26-2009
20080310457Data Communication System, Data Transmitting Device, Data Receiving Device, Data Communication Method, and Data Communication Program - There is provided a data communication system that performs power line communication having satisfactory communication quality by disposing data in channels where notches or noises do not exist in a distributed manner. There is included a step S12-18-2008
20080205451TRANSMISSION SCHEME FOR UPLINK ACCESS IN A FDMA SYSTEM - Transmission scheme for the uplink of FDMA systems that improves performance in an interference-dominated system by using a pilot scheme that provides enough information so that channel estimates can be obtained for a particular user, but which at the same time makes it possible to use pilot patterns that are different in different cells so that co-channel interference is mitigated. A codeword is used to position a set of pilot symbols within a set of subcarriers wherein each subcarrier has a first pilot time slot and a second pilot time slot associated with one or more data time slots. The set of subcarriers are identified on which to transmit the composite signal and the first pilot time slots and the second pilot time slots are filled with the pilot symbols in accordance with the codeword. The composite signal is then formatted as a combination of modulated data and pilot signals.08-28-2008
370483000 Using angle modulation 3
20120243558SIGNAL TRANSMISSION SYSTEM, SIGNAL TRANSMISSION METHOD, TRANSMITTING DEVICE AND RECEIVING DEVICE - A signal transmission system including a transmitting device and a receiving device, including: the transmitting device including: a first modulator that modulates a frequency of a control signal; and a first multiplexer that multiplexes the frequency-modulated control signal onto a DVI (Digital Visual Interface) signal to be transmitted to the receiving device via a single network cable; and the receiving device including: a first separator that separates the frequency-modulated control signal from the multiplexed DVI signal; and a first demodulator that demodulates the separated control signal.09-27-2012
20080225895Apparatus and Method for Generating Signal According to Ifdma, and Apparatus for Receiving Signal - A signal generation apparatus and signal receiving apparatus according to an Interleaved Frequency Division Multiple Access scheme is provided. The signal generation apparatus generates a plurality of complex symbols by digital-modulating a plurality of data symbols, and rotates the generated plurality of complex symbols in a plurality of each different phase angles. The signal generation apparatus generates a plurality of transmission symbols by repeating a plurality of rotated complex symbols at predetermined times, and rotating the repeatedly generated plurality of transmission chips in phase angles of an orthogonal phase sequence for the respective users. When the signal receiving apparatus receives the plurality of transmission symbols generated as described above, the maximum diversity gain may be obtained.09-18-2008
20130121350Overlay Modulation of COFDM Using Phase and Amplitude Offset Carriers - Systems and methods are presented for transmitting additional data over preexisting differential COFDM signals by modulating existing data carriers with a phase and an amplitude offset. In exemplary embodiments of the present invention, additional data capacity can be achieved for an COFDM signal which is completely backwards compatible with existing satellite broadcast communications systems. In exemplary embodiments of the present invention additional information can be overlayed on an existing signal as a combination of amplitude and phase offset from the original QPSK symbols, applied for each information bit of the overlay data. With two additional levels of modulation, a receiver can demodulate the information from each of the previous stages and combine the information into a suitable format for soft decoding. The first stage of demodulation will be recovery of overlay data from the amplitude modulated D8PSK. Because other amplitude variations due to multi-path are also expected, the data gathered from the FFT in the receiver must be equalized to the channel conditions. After channel equalization has been performed, soft overlay data can then be derived from the distance off the unit circle. In order to recover the phase modulated overlay data, the equalized symbols must first be differentially demodulated and corrected for any common phase error offset. After common phase removal, overlay phase information can be obtained.05-16-2013
370482000 Particular carrier generation 3
20130058361SIGNAL FOR TRANSMISSION IN SINGLE-CARRIER COMMUNICATION SYSTEM - An apparatus and method for generating a signal for transmission in a single-carrier communication system are disclosed. The apparatus comprises a reference signal inserter, which multiplexes data symbols with reference signal symbols in time domain to form a plurality of symbol blocks as the signal for transmission, wherein the plurality of symbol blocks include symbol blocks of a first type and symbol blocks of a second type, wherein each of the symbol blocks of the first type includes only data symbols, and wherein each of the symbol blocks of the second type includes both data symbols and reference signal symbols.03-07-2013
20080285595SPREAD BASEBAND INJECTED PILOT CARRIER - A system for communicating includes a transmitter that has an encoder and baseband modulator that encodes and modulates a sequence of data symbols as a payload data constellation to be communicated. A PN sequence generator and baseband modulator form a pilot signal as a training sequence with a periodically repeating spread spectrum sequence. A circuit superimposes the pilot signal over the sequence of data symbols to form a composite communication signal that is transmitted. A receiver receives the composite communication signal and extracts the pilot signal from the composite communication signal.11-20-2008
20110158259Apparatus and Method for Frequency Division and Filtering - An apparatus and method for frequency division and filtering are provided. The apparatus includes a memory unit, an extrema calculation unit, and an envelope calculation unit. The memory unit is for storing sample data. The extrema calculation unit is for outputting and storing a number of maximum values and a number of minimum values to the memory unit according to the sample data. The envelope calculation unit is for calculating a mean envelope according to the maximum values and the minimum values, wherein within a duration when the envelope calculation unit respectively calculates an upper envelope and a lower envelope according to the maximum values and the minimum values, the envelope calculation unit outputs a value of the mean envelope to the memory unit according to a value of the upper envelope and a value of the lower envelope with respect to a corresponding identical address.06-30-2011
370492000 Repeater 3
20080259961Data Unit Relay Device and Method of Controlling the Same - A method of controlling a data unit relay device is described, applied to a relay ARQ protocol in accordance with which a source peer sends data units to a destination peer via at least one relay peer. The relay ARQ protocol provides for a first type and second type of receipt information, where the first type is indicative of a correct receipt at a relay peer, and the second type is indicative of a correct receipt at the destination peer. In a data unit relay device that is arranged for deliberately dropping data units of the relay ARQ protocol under one or more predetermined conditions, a procedure is provided for indicating to the source peer and the destination peer that a data unit has been deliberately dropped and for identifying the deliberately dropped data unit, such that the source and destination peer may perform retransmission control for the dropped data unit as if it had been successfully received at the destination peer10-23-2008
20090180496NETWORK SYSTEM AND METHOD FOR RELAYING COMMUNICATION BETWEEN DEVICES - Provided is a network system for relaying communication between devices communicating with the Internet using different communication networks. The network system includes a first home network controller which controls first home network devices within a household; a repeater that is connected to the Internet via a first communication network and which relays communication between the Internet and the first home network controller; a second home network controller that is connected to the Internet via a second communication network and which relays communication between the Internet and each of second home network devices within the household; and a management server that is connected to the Internet and relays communication between the first and second home network devices within the household, wherein the first and second home network devices communicate using the first and second communication networks, respectively.07-16-2009
20090067451System and method for extending DSL transmission range - A system and method is provided to extend transmission range of a digital subscriber line (DSL). In one embodiment, a method includes receiving an input signal including a broadband data signal having a first signal strength and a telecommunication signal. The broadband data signal may be separated from the telecommunication signal. The broadband data corresponding to the broadband data signal may be regenerated, wherein the regenerated broadband data signal has a second signal strength which is greater than the first signal strength according to an embodiment of the invention. According to another aspect of the invention, the regenerated broadband data signal may be merged with the telecommunication signal into an output signal and the output signal may be transmitted over a subscriber line.03-12-2009
370496000 Signaling 2
20080212614METHOD AND SYSTEM FOR EXTENDING TRANSMISSION DISTANCE OF ADSL SIGNAL - A method for extending transmission distance of an ADSL signal includes: increasing power spectral density (PSD) of an ADSL signal when a parameter of the ADSL signal is equal to or greater than a preset threshold; and sending the ADSL signal with the increased PSD. A system for extending transmission distance of ADSL signal includes a PSD adjustment determining unit, a PSD adjusting unit and a transmitting unit. A method for promoting transmission rate of an ADSL signal is disclosed as well. The solution extends the coverage of the ADSL signal, and when the CO increases the downlink PSD, the CEP need not to be modified, which reduces the cost.09-04-2008
20120275473SHELF OF A NETWORK SYNCHRONIZATION DEVICE, AND NETWORK SYNCHRONIZATION DEVICE - A shelf of a network synchronization device includes: a clock input reception unit which receives an input of a clock signal; a clock output unit which outputs a clock signal; a clock interruption detection unit which detects a clock interruption if the clock input reception unit does not receive a clock; an AIS signal detection unit which detects an AIS signal if the AIS signal is received through the clock input reception unit; an AIS signal generation unit which generates the AIS signal; an alarm control unit which outputs a predetermined alarm notification when the AIS signal detection unit does not detect the AIS signal if the clock interruption detection unit detects the clock interruption; and an output signal selection unit which outputs the AIS signal generated by the AIS signal generation unit to the clock output unit if the clock interruption detection unit detects the clock interruption.11-01-2012
370489000 Bus (distributed stations) 2
20100189134CONTROL NETWORK WITH DATA AND POWER DISTRIBUTION - A control network comprises a plurality of network nodes arranged in a plurality of tiers, with first-tier nodes and lower tier nodes. A master control bus interconnects the first-tier nodes, which are also connected to a power source. Lower-tier buses interconnect groups of the lower tier nodes. The lower-tier buses include both data lines and a power source line derived from the power source, allowing the lower tier nodes to selectively distribute power to local loads. A first-tier node may be embodied as a hub controller configured to be connected to one or more of said lower-tier buses. The hub controller may comprise a plurality of internal hub nodes (including a hub master node and hub slave nodes) integrated within the same physical unit.07-29-2010
20080205450HIGH SPEED POWER LINE NETWORK CONNECTOR AND METHOD FOR POWER LINE NETWORKING - A power line module and method. In a preferred embodiment, the power line module is adapted to couple to a power line outlet, which is provided on a power line network within a spatial region. A power line chip is within a housing. In a preferred embodiment. the power line chip has an input/output port and is capable of converting a power line telecommunication signal having a data rate of greater than about 80 Megabits per second from the power line network to an Ethernet signal for use in a local area network segment. The module has a coupling device coupled to the input/output port of the power line chip. In a preferred embodiment, the module has a first pin comprising a plurality of first spring members operably coupled the coupling device. The first pin is insertable into a first site of the power outlet. The module has a second pin comprising a plurality of second spring members operably coupled to the coupling device.08-28-2008
370481000 Multiple frequency translations 1
20080285594System and method for adapting analog systems to communicate with packet networks - A system for adapting an analog system to a packet network may include an electronic signal adapter in communication with the analog system and packet network. The electronic signal adapter may be configured to convert information received in data packets from the packet network into dual-tone multiple frequency (DTMF) signals and single tone analog signals and to communicate the DTMF and single tone analog signals to the analog system. The single tones may have a signal strength below approximately −25 dBm. The electronic signal adapter may further be configured to receive and convert analog signals into digital data for communication in data packets over a packet network.11-20-2008
370484000 Digital analysis or synthesis of a group 1
20080219292System of Frequency Allocation for User Access Local Area Network, and Uplink and Downlink Transmission Methods Thereof - A system of frequency allocation for a user access local area network, and uplink and downlink transmission methods thereof are provided. The system of frequency allocation for a user access local area network comprises: an information processing apparatus, a switch, a plurality of first modulators, a broadband high frequency synthesizer, a downlink amplifier, a plurality of trunk splitters, a plurality of branch splitters, a plurality of user terminal digital high frequency demodulators, a plurality of user terminal modulators, a plurality of trunk mixers, a plurality of branch mixers, an uplink amplifier, a broadband high frequency allocator and a plurality of first demodulators. The present invention uses a new communication resource configuration technology with high transparency in which every user is provided with his dedicated communication channel regardless of its busy/idle status. In addition, the present invention adopts a new physical layout construction of the user access LAN with a high frequency broadband, a high speed, and a large capacity in which passive operations without relay amplification can be achieved in the main trunk. Therefore, the seamless communication resource utilization is achieved, and the operation and communication service technology is provided which is suitable to the operation custom of the public so as to be easily learned and propagation.09-11-2008
Entries
DocumentTitleDate
20130039368SYSTEM AND METHOD FOR FREQUENCY-AGILE TRANSMISSION IN A WIRELESS COMMUNICATION DEVICE - In accordance with some embodiments of the present disclosure, a method may include determining a range of frequencies allocated to resource blocks to be transmitted during a subsequent sub-frame slot or sounding reference symbol sub-slot. The method may also include determining an approximate center frequency of the range of frequencies. The method may additionally include modulating resource blocks of the sub-frame or sounding reference symbol sub-slot at the approximate center frequency. The method may further include transmitting the modulated resource blocks at the approximate center frequency.02-14-2013
20090262758DIGITAL SIGNAL DEMULTIPLEXING APPARATUS AND DIGITAL SIGNAL MULTIPLEXING APPARATUS - A digital signal demultiplexing apparatus that can demultiplex and a digital signal multiplexing apparatus that can multiplex signals of channels having arbitrary frequency intervals and bandwidths are provided. The digital signal demultiplexing apparatus performs discrete Fourier transform on an input signal, output samples existing within frequency bands of each channel from samples of the frequency domain, add samples such that the number of samples of each channel become a power of two, and performs, on the samples of each channel, discrete inverse Fourier transform of a length the same as the number of the samples. The digital signal multiplexing apparatus performs discrete Fourier transform of a length the same as the number of samples of an input signal for a predetermined period, outputs samples existing within frequency bands of each channel from samples of the frequency domain of each channel, and arrange the samples according to frequency assignment of each channel to perform discrete inverse Fourier transform.10-22-2009
20090092154METHOD, SYSTEM, AND APPARATUS FOR EXTENDED RATE/RANGE COMMUNICATION OVER A COMMUNICATION NETWORK - A technique for communicating multimedia data between nodes over coaxial cable, wherein the nodes are connected via a coaxial cable network, is disclosed. In an embodiment, the technique involves establishing a primary channel for communicating between first and second nodes of the coaxial cable network, establishing a secondary channel for communicating between the first and second nodes of the coaxial cable network, wherein the primary and secondary channels are in different frequency bands and wherein the primary channel is used for communicating media access control frames, and communicating a time series of data frames between the first and second nodes using both the primary channel and the secondary channel.04-09-2009
20090257454OFDM TRANSMITTER WITH ADAPTIVE BIT INTERLEAVER FOR ADAPTIVE BIT LOADING AND METHOD FOR OFDM COMMUNICATIONS - A multi-antenna transmitter includes an adaptive bit interleaver for orthogonal frequency division multiplexed (OFDM) communications. The adaptive bit interleaver permutes a variable number of coded bits per OFDM symbol (Ncbps). The variable number of coded bits is calculated based on individual subcarrier modulation assignments for orthogonal subcarriers. The interleaver matrix size may be based on the variable number of coded bits per OFDM symbol and the number of subchannels. The interleaver may add padding bits to the interleaver matrix to fill any remaining positions, and after performing an interleaving operation, the interleaver may prune the padding bits to provide a sequence of interleaved bits for subsequent modulation on the orthogonal subcarriers and transmission by more than one antenna. The transmitter may transmit the OFDM symbol in accordance with an IEEE 802.16 standard.10-15-2009
20120195329HYBRID WIRELESS/WIRED RoF TRANSPONDER AND HYBRID RoF COMMUNICATION SYSTEM USING SAME - A radio-over-fiber (RoF) hybrid wired/wireless transponder is disclosed that is configured to provide both wireless and wired communication between a hybrid head-end and one or more client devices. The hybrid transponder includes optical-to-electrical (O/E) and electrical-to-optical (E/O) conversion capability and is configured to frequency multiplex/demultiplex electrical “wired” signals and electrical “wireless” signals. The electrical wireless signals are wirelessly communicated to the client device(s) via a multiple-input/multiple-output (MIMO) antenna system within a cellular coverage area. The electrical wired signals are communicated to the client device(s) via a wireline cable that plugs into a wireline cable port on the transponder. The hybrid RoF system includes a hybrid head-end capable of transmitting and receiving wired and wireless optical signals, and an optical fiber cable that is optically coupled to the hybrid head-end and to at least one hybrid transponder. Drop-down transponder configurations that allow for easy wired and wireless connectivity between the client device(s) to the transponder(s) are also disclosed.08-02-2012
20090010282Periodical refreshing for radio channels quality indicator - This method for receiving a data stream transmitted over several radiofrequency channels each with a different frequency, comprises scanning the bandwidth to identify available radiofrequency channels, determining a quality indicator for each available radiofrequency channel and selecting a channel for receiving the data stream depending upon said quality indicators. The method further comprises determining a refreshing period for the quality indicator of each available channel and weighting every determined refreshing period depending on the value of the quality indicator of the currently received channel.01-08-2009
20110299556MULTI-CARRIER SIGNAL TRANSMITTER AND MULTI-CARRIER SIGNAL RECEIVER - A multi-carrier signal transmission apparatus transmits a transmission stream including at least preamble information necessary for synchronizing a transmission signal and data information as a multi-carrier signal. A modulator generates a transmission symbol stream by modulating an arrangement of the preamble information and the data information. A symbol expanding portion expands the transmission symbol stream on a frequency axis by generating a complex conjugate value of at least one part of the preamble information symmetrically on the frequency axis.12-08-2011
20090274174METHOD OF GENERATING PILOT PATTERN FOR ADAPTIVE CHANNEL ESTIMATION IN OFDMA SYSTEMS, METHOD OF TRANSMITTING/RECEIVING USING THE PILOT PATTERN AND APPARATUS THEREOF - Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. The pilot pattern selects pilot symbol positions based on distances from pilots of previous orthogonal frequency division multiple access (OFDMA) symbols to a subcarrier position of a current OFDMA symbol in the frequency domain and the time domain, so that a low pilot density is maintained so as to effectively transmit data, and stable channel estimation performance can be obtained even in a bad channel environment. In addition, the minimum burst allocation size is determined according to the channel environment between the base station and the terminal, guaranteeing channel estimation performance suitable for the channel environment, and improving granularity, channel estimation latency, and channel estimation memory size.11-05-2009
20080291943Method of Modifying the Power Spectral Density of a Telecommunications Line and an Adjustment Method Using That Method - The invention relates in particular to a method of modifying the spectral power density of a telecommunications line sending data from a sender terminal to a receiver terminal, the spectral power density being divided between a plurality of sub-bands of data transmission frequencies of the line. This method includes the following steps: an activation message is sent from the sender terminal to the receiver terminal and the reception of that activation message by the receiver terminal causes the sending of a message requesting modification of the spectral power density transmitted in a selected sub-band from the receiver terminal to the sender terminal.11-27-2008
20090310624System and method for receiving multiple channels - The disclosed embodiments relate to a system and method for receiving multiple channels in a communications receiver. The system includes a first module further including an analog to digital converter for converting an input signal to a first and second digital signal and a first processor for processing the first digital signal, and a second module further including a second processor to process the second digital signal. The method involves receiving an analog signal, converting the analog signal to a first and second digital signal, passing the first digital signal through a first interface, processing the first digital signal to a produce a first plurality of output signals, passing the second digital signal through a second interface, and processing the second digital signal to produce a second plurality of output signals.12-17-2009
20100085988INFORMATION PROCESSING APPARATUS AND SIGNAL TRANSMISSION METHOD - An information processing apparatus is provided which includes a signal multiplexing unit for multiplexing a plurality of transmission signals, each in a different frequency band and not containing a DC component, and a power signal supplied from a DC power supply and generating a multiplexed signal, a single signal cable through which the multiplexed signal generated by the signal multiplexing unit is transmitted, and a signal separating unit for separating the multiplexed signal transmitted through the signal cable into signals, each in a frequency band of one of the plurality of transmission signals, and a signal in a frequency band of the power signal.04-08-2010
20080247421Service assembly architecture - A method for effecting communication between devices in a communications network, the method comprising managing a communications process control flow; providing a plurality of re-usable components of the process control flow in which each component comprises a process control activity between two of the devices; aggregating the plurality of re-usable components into a sequence of the communications process control flow; in which each re-usable component is arranged to process a data structure; in which the data structure is the same for each re-usable component of the communications process control flow.10-09-2008
20110007758Communicating Distinct Data Using Polarized Data Signals - A method and system is provided for communicating distinct data over a single frequency using multiple polarized data signals. Data signals of the single frequency conveying first data, second data, and third data are polarized in a first polarization scheme and a second polarization scheme. The data signals comprise a first data signal, a second data signal, a third data signal, and inverse of the third data signal in a first configuration or a second configuration. The polarized data signals are transmitted from transmitting stations to one or more receiving stations. The first data, second data, and third data are obtained from the data signals received at the receiving stations using an antenna of a first polarity and an antenna of a second polarity. The amount of distinct data transmitted over the single frequency is increased by, for example, about 50% without causing interference between the data signals.01-13-2011
20120069856Rate Selection for Channel Selection in Flexible WDM Networks - An inventive method implemented in a communications system includes obtaining a first data rate in a flexible wavelength division multiplexing FWDM network and applying a recursive rate selection for determining a given data rate from the obtained first data rate such that a required spectrum over the FWDM network for the given data rate is minimized, the first data rate being lower than the given data rate.03-22-2012
20110142076DATA TRANSMISSION METHOD USING STBC SCHEME - A data transmission method using a space time block code (STBC) scheme is provided. The method includes generating a modulation symbol by performing coding and constellation mapping on an information bit, generating a frequency-domain symbol by performing discrete Fourier transform (DFT) on the modulation symbol, generating a single carrier-frequency division multiple access (SC-FDMA) symbol by performing inverse fast Fourier transform (IFFT) after mapping the frequency-domain symbol to a subcarrier, and transmitting the SC-FDMA symbol on a slot basis.06-16-2011
20090257453TRANSMISSION APPARATUS AND RECEIVING APPARATUS - In an audio and video transmission apparatus, a frequency division parameter control unit outputs a frequency division parameter Pt, Qt for relating a pixel clock (frequency: pclk) for video data with an audio clock (frequency: ft) for audio data. An audio/video/packet multiplexing unit converts audio data and the frequency division parameter Pt, Qt into packets, and superimposes the packets into blanking intervals of video data, thereby producing transmission data. The frequency division parameter Pt, Qt satisfies a relationship represented by:10-15-2009
20100158049SYSTEM FOR STACKING SIGNALS IN AN EXPANDED FREQUENCY RANGE - A device for stacking signals in an expanded frequency range includes an upconverter and a multiplexer. The upconverter is configured to receive upstream signals that are in a first frequency range, upconvert some of the upstream signals that are in a first frequency sub-range of the first frequency range and pass some of the upstream signals that are in a second frequency sub-range of the first frequency range. The multiplexer is configured to stack the upconverted upstream signals and the upstream signals in the second frequency sub-range and output the stacked upstream signals.06-24-2010
20100189132METHOD AND APPARATUS FOR MULTI-CARRIER FREQUENCY DIVISION MULTIPLEXING TRANSMISSION - A general frequency division multiplex (GFDM) transmission system is proposed. Vacant frequency ranges are detected and subsequently used for transmission, wherein a single carrier transmission system with cyclic prefixing is deployed. A corresponding transmitter and receiver are disclosed.07-29-2010
20100054281Method of transmitting modulated signals multiplexed by frequency division multiplexing and physical quantity detector using this method - A transmitting method has steps of modulating carrier waves having frequencies set at ½03-04-2010
20110019697SC-FDMA TRANSMISSION DEVICE AND SC-FDMA TRANSMISSION SIGNAL FORMATION METHOD - It is possible to provide an SC-FDMA transmission device and an SC-FDMA transmission signal formation method which improve the transmission efficiency of the SC-FDMA transmission signal. The SC-FDMA transmission device (01-27-2011
20110026546METHOD OF ASSEMBLING A FRAME IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS (OFDMA)-BASED COMMUNICATION SYSTEM AND COMMUNICATION SYSTEM - A method of assembling a frame in an Orthogonal Frequency Division Multiple Access (OFDMA)-based communication system, wherein data packets to be transmitted from a broadcast station to a receiver are given a rectangular shape in terms of the two dimensions—time and frequency—of the OFDMA frame, and wherein the data packets are successively fitted into the OFDMA frame by way of a frame assembly scheduler, is characterized in that the filling process of the OFDMA frame is based on an ordered list of data structures that represent the current empty space within the OFDMA frame. Furthermore, a corresponding communication system is disclosed.02-03-2011
20110044356SYSTEM AND METHOD FOR MODE SELECTION BASED ON EFFECTIVE CINR - Selecting an optimal ECINR mode in a digital communication system, by constructing an offline relevant modes database having a list of transmission-reception methods for possible MIMO configurations, and mobility characterization, gathering online channel state and capabilities information, retrieving parameters from the relevant modes database, based on the gathered data/information for creating a concurrent list, excluding some MIMO modes off the list, for which the available channel matrix is insufficient, the modes left at the end of this step being “currently relevant modes’, calculating post processing per tome physical CINR (PCINR) for each of the currently relevant modes found, calculating ECINR for each of the currently relevant modes using the PCINR, choosing the optimal MIMO mode and MCS combination, which is the parameters' combination with highest throughput, which provide the best ECINR under QoS requirements.02-24-2011
20110116516METHOD OF GENERATING PILOT PATTERN FOR ADAPTIVE CHANNEL ESTIMATION IN OFDMA SYSTEMS, METHOD OF TRANSMITTING/RECEIVING USING THE PILOT PATTERN AND APPARATUS THEREOF - Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern.05-19-2011
20090016381Strategy to Verify Asynchronous Links Across Chips - Various embodiments of the invention provide a frequency shifter to vary the frequency of data transmitted over time, such as to increase and decrease the frequency of test data transmitted over time to verify a digital communication device's ability to receive data having various frequencies within a specific parameter range. The frequency shifter includes a frequency modifier to shift or vary an input clock frequency to a variety of output clock frequencies, such as according to a test protocol. The frequency shifter also includes an elastic data buffer to receive the test data at the input clock frequency and to output the test data at the plurality of output clock frequencies provided by the frequency modifier.01-15-2009
20090016380Methods and Apparatus for RF Channel Switching in a Multi-Frequency Network - Methods and apparatus for RF channel switching in a multi-frequency network. In an aspect, a method includes identifying a multiplex set that comprises one or more content flows, wherein the multiplex set is one of a vertical multiplex (VM) set and a unified multiplex (UM) set, generating an overhead message that associates one or more RF carrier frequencies with the one or more content flows, and transmitting the overhead message over the multi-frequency network. An apparatus includes input logic configured to receive an overhead message that associates one or more content flows with one or more RF carrier frequencies, and processing logic configured to detect a channel switch event that identifies a selected content flow, determine a selected RF carrier frequency associated with the selected content flow based on the overhead message, and switch to the selected RF carrier frequency to receive the selected content flow.01-15-2009
20110176558MULTICHANNEL INTERFACING DEVICE HAVING A SWITCHING CIRCUIT - The invention relates to an interfacing device for transmission through interconnections used for sending a plurality of electrical signals.07-21-2011
20120120970System And Method For Processing A Frequency Division Multiplexing Signal - A method for processing a frequency division multiplexing signal transmitted in a channel is provided. The method includes the steps of a) receiving the frequency division multiplexing signal having a residual intercarrier interference (ICI) and a channel noise and transmitted by plural subcarriers; b) performing a cyclic prefix removal and a discrete Fourier transform for the frequency division multiplexing signal to obtain a frequency-domain signal; c) analyzing the frequency-domain signal to obtain a plurality of correlation values for the residual ICI and the channel noise; and d) performing a communication signal processing for the frequency division multiplexing signal based on at least one of the plural correlation values.05-17-2012
20110103405Technique for adjusting a phase relationship among modulation symbols - A technique for adjusting a phase relationship among modulation symbols is disclosed. A method embodiment of this technique comprises the steps of applying to a sequence of modulation symbols a phase ramp that continuously increases over the duration of the symbol sequence, and applying a compensation phase to each modulation symbol to introduce a phase offset between two subsequent modulation symbols. The joint application of the phase ramp and the compensation phase can be used to establish a saw tooth-like phase characteristic over the sequence of modulation symbols. In one embodiment, the phase ramp is applied in the context of impressing a frequency shift on the modulation symbols.05-05-2011
20080317067Broadband Radio Connection Communication Device - The communication device extracts frame data originated by the base station and obtains the parameters of using bandwidth, stored in the header of the frame data. Free bandwidth is calculated by subtracting an already used band from the full band of the base station. It is determined whether the free band can accommodate the band that its own terminal desires to use. If it can be accommodated, a network entry sequence is run in order for the terminal to communicate with the base station since communications with the base station is available.12-25-2008
20100309931COMMUNICATION SYSTEM USING LOW BANDWIDTH WIRES - A high frequency signal is down-converted into an intermediate frequency signal, transmitted over a limited bandwidth medium from a master unit to a remote unit and up-converted back into its original high frequency at the remote unit. The up-conversion is aided by reconstruction of a reference signal embedded at the master unit as a carrier for a management signal which is transmitted to the remote unit through the same limited bandwidth medium together with the intermediate frequency signal. The reference signal is reconstructed using a phase locked loop which includes a charge pump and is kept stable during intervals between bits and messages by a charge pump shutter.12-09-2010
20080205449CROSS-LINK - A communication network comprises a first digital subscriber line (DSL) unit having a plurality of application ports and at least one DSL port; and a second DSL unit having a plurality of application ports and at least one DSL port; wherein the first DSL unit is communicatively coupled to the second DSL unit via a DSL pair coupled to the at least one DSL port in each of the first and second DSL units; and wherein each of the first and second DSL units are configured to receive a signal of a first interface format over one of the plurality of application ports, extract timeslots from the received first interface format signal, transmit the timeslots over the at least one DSL port, and use timeslots received over the at least one DSL port to generate at least one second signal of a dissimilar interface format.08-28-2008
20100329283METHOD AND DEVICE FOR RECEIVING NON-SYNCHRONOUS SIGNAL IN OFDMA SYSTEM - A method and device for receiving a non-synchronous signal in an Orthogonal Frequency Division Multiple Access (OFDMA) system are provided. The method includes the following steps. Fourier transform is performed on a received first time domain signal to acquire a corresponding frequency domain signal. A sub-carrier occupied by a band of a non-synchronous signal to be received in the frequency domain signal is set to zero, inverse Fourier transform is performed on the frequency domain signal to acquire a second time domain signal, and the second time domain signal is subtracted from the first time domain signal. Or, the sub-carrier other than the sub-carrier occupied by the band of the non-synchronous signal to be received in the frequency domain signal is set to zero, and inverse Fourier transform is performed on the frequency domain signal to acquire a time domain received signal corresponding to the band of the non-synchronous signal.12-30-2010
20110051749METHOD OF REFERENCE SIGNAL ALLOCATION IN WIRELESS COMMUNICATION SYSTEMS - A method is provided for determining reference signal positions in a frequency-time domain in an Orthogonal Frequency Division Multiple Access (OFDMA) system. A plurality of sub-carriers are selected in one resource block according to a predetermined mother pattern for reference signal allocation. When a single resource block is assigned for transmission to a user, the reference signal positions are determined corresponding to the plurality of selected sub-carriers in the single resource block. When multiple resource blocks are assigned for transmission to a user, the reference signal positions are determined in the multiple resource blocks by reducing a number of the plurality of selected sub-carriers in the mother pattern for at least one of the multiple resource blocks.03-03-2011
20100020827SIGNAL PROCESSING SYSTEM, SIGNAL PROCESSING APPARATUS AND METHOD, RECORDING MEDIUM, AND PROGRAM - The present invention relates to a signal processing system, a signal processing apparatus and method, a recording medium, and a program in which high frequency components of a narrow-range signal having suppressed high frequency components can be restored with high accuracy. A narrow-range audio signal having low frequency components is divided into frames by a frame-unit dividing unit 01-28-2010
20100020826Method and Apparatus for Channelizing Sampled Broadband Signal - A system for isolating individual channels in a broadcast signal is provided. The system includes a plurality of multipliers, each having an input and an output. A summer coupled to the outputs of each of the plurality of multipliers is provided to generate an output. A multiplication factor system provides a multiplication factor to each of the multipliers to select a predetermined frequency channel of the input signal.01-28-2010
20120147903DEVICE, METHOD AND SYSTEM FOR TRANSMITTING DIGITAL BROADCAST SIGNALS - A device for transmitting digital broadcast signals comprises: at least a first encoding unit, each of which executes forward error correction encoding for data in a sub-channel; at least a time domain interleaving unit, each of which receives the output data from a first encoding unit and interleaves the data in time domain; a first multiplexing unit, for multiplexing the interleaved data to form Main Service Channel (MSC) data a second encoding unit, for executing forward error correction encoding for a second group of data information to acquire Fast Information Channel (FIC) data a differential modulating unit, for performing differential modulation to FIC data, and performing differential modulation to MSC data adopting at least two modulation modes; and a frame generating and transmitting unit, for generating transmission frames using differential modulation symbol sequences generated by the differential and transmitting.06-14-2012
20110019696MMSE METHOD AND SYSTEM - A method for reducing complexity of MMSE computations in a receiver, by which an MMSE matrix is computed once per pre-defined group of sub-carriers and then the sub-carrier MMSE matrix for other sub-carriers in that group is computed by phase shifts per column combined with phase shifts per row of the computed MMSE matrix, which corresponds to the column/row phase shifts of the respective channel.01-27-2011
20110103406FLEXIBLE OFDM/OFDMA FRAME STRUCTURE FOR COMMUNICATION SYSTEMS - A flexible OFDM/OFDMA frame structure technology for communication systems is disclosed. The OFDM frame structure technology comprises a configurable-length frame which contains a variable length subframe structure to effectively utilize OFDM bandwidth. Furthermore, the frame structure facilitates spectrum sharing between multiple communication systems.05-05-2011
20120134375MULTI-BAND DATA TRANSMISSION - A system for transmitting and receiving data includes a physical adaptation block configured to separate the data into a plurality of frequency bands. Each of the frequency bands has an associated symbol time, and each of the associated symbol times is a whole multiple of one half of a smallest symbol time of all of the frequency bands. An analog front end is configured to provide the data in the plurality of frequency bands to a transmission medium.05-31-2012
20100189133FREQUENCY DIVISION MULTIPLEX TRANSMISSION SIGNAL RECEIVING APPARATUS - A frequency division multiplex transmission signal receiving apparatus for receiving a frequency division multiplex transmission signal using a plurality of carries includes: an estimation section estimating a transfer function of a received signal after the received signal has been transformed into a frequency domain signal; a demodulation section demodulating the received signal according to the transfer function estimated by the estimation section; a plurality of variation detecting sections performing variation detection using a plurality of different variation detection methods, based on the transfer function estimated by the estimation section; a reliability determining section determining reliability based on a result of a combination of variation detection results of the plurality of variation detecting sections; and a correction section performing error correction of the demodulated signal from the demodulation section, the demodulated signal being subjected to an application of a reliability determination result of the reliability determining section.07-29-2010
20120177065Secure Data Transmission Using Spatial Multiplexing - An example transmitter includes an encoder, a plurality of modulators and a spatial multiplexer. The encoder is configured to encode one or more input bit streams into a plurality of coded bit streams which are provided as output. Each modulator is configured to receive and modulate a respective one of the plurality of coded bit streams and to provide a modulated output signal. The spatial multiplexer is configured to spatially multiplex the plurality of modulated output signals for insertion on a spatially multiplexing waveguide. A modulated output signal(s) may be inserted onto a mode of a multi-mode fiber or onto a core of a multi-core fiber. In one embodiment, a subset of the plurality of spatially multiplexed modulated output signals which correspond to the one or more input bit streams must be simultaneously and spatially selectively detected in order to recover a first input bit stream.07-12-2012
20110038387METHOD OF GENERATING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of generating a reference signal includes acquiring a base sequence and acquiring a reference signal sequence with a length N from the base sequence. Good PAPR/CM characteristics of the reference signal can be kept to enhance performance of data demodulation or uplink scheduling.02-17-2011
20120269203SIGNAL DEMULTIPLEXING DEVICE, SIGNAL DEMULTIPLEXING METHOD AND NON-TRANSITORY COMPUTER READABLE MEDIUM STORING A SIGNAL DEMULTIPLEXING PROGRAM - Provided is a signal demultiplexing system that can minimize losses in demultiplexing performance even if signals unsuited to demultiplexing are inputted. The provided signal demultiplexing device contains: an input signal analysis means for determining whether or not a plurality of input signals are suited to demultiplexing; a data memory means for storing data from frequency-domain input signals which result from transformation of the aforementioned input signals into frequency-domain signals; a selection control means for storing the frequency-domain input signals in the data memory means if the input signal analysis means has determined that the input signals are suited to the generation of a demultiplexing matrix for demultiplexing; and a demultiplexing matrix generation means for generating a demultiplexing matrix using frequency-domain input signals including the most recent and older frequency-domain input signals stored in the data memory means.10-25-2012
20120087382CHANNEL STATE INFORMATION TRANSMISSION METHOD APPRARATUS AND SYSTEM - A precoding method, a precoding apparatus, a Frequency Domain Equalization (FDE) method, and an FDE apparatus are provided in the embodiments of the present invention. The precoding method includes: performing offset modulation for a transmitting signal vector; calculating a precoding matrix according to the offset-modulated transmitting signal vector and a receiver decision signal vector, where the precoding matrix is used for performing precoding for the transmitting signal vector; and performing precoding for the transmitting signal vector according to the precoding matrix. Linear precoding is performed by using the offset-modulated signal on the transmitter, and therefore, the interference caused by multiple antennas and multipath propagation is reduced, the system BER is reduced, and the complexity of implementation is low.04-12-2012
20130022059DUAL MODE COMMUNICATION SYSTEMS AND METHODS - Embodiments of dual mode communication systems and methods are disclosed. On system embodiment, among others, comprises logic configured to perform spatial multiplexing and expanded bandwidth signaling to data.01-24-2013
20080253400Non-orthogonal frequency-division multiplexed communication through a non-linear transmission medium - A method for non-orthogonal frequency division multiplexed communication through a non-linear transmission medium includes the steps of selecting at least one desired bandwidth, selecting a non-orthogonal pair of base frequencies within a first bandwidth of the at least one desired bandwidth, identifying where primary intermodulation products formed as a result of signal transmission on the pair of base frequencies fall within the first bandwidth. The method may also include the step of selecting a plurality of non-orthogonal interleaved frequencies adjacent at least one of the pair of base frequencies so as to be interleaved between the primary intermodulation products to form a frequency cluster which includes the at least one of the pair of base frequencies and the interleaved frequencies.10-16-2008
20130100965SYSTEM AND METHOD FOR SPREAD SPECTRUM COMMUNICATION - A spreading code generating apparatus carries out M-sequence multiplication and zero value addition of generated orthogonal codes to obtain channel identification codes, and then carries out inverse Fourier transform of the channel identification codes to generate spreading codes and inverse spreading codes. A transmitting apparatus and a receiving apparatus store the spreading codes and the inverse spreading codes generated by the spreading code generating apparatus, respectively, and use a single code respectively selected from the stored codes to carry out spread spectrum communication.04-25-2013
20110268138METHOD AND APPARATUS FOR CHANNELIZING SAMPLED BROADBAND SIGNAL - A system for isolating individual channels in a broadcast signal is provided. The system includes a plurality of multipliers, each having an input and an output. A summer coupled to the outputs of each of the plurality of multipliers is provided to generate an output. A multiplication factor system provides a multiplication factor to each of the multipliers to select a predetermined frequency channel of the input signal.11-03-2011
20100278197DOUBLE FREQUENCY COMBINER - The invention discloses a dual frequency multiplexer by which a first and second coaxial harmonic oscillator type band pass filters are disposed in a box. The box includes a base body, a cover plate and a cover body. The two coaxial harmonic oscillator type hand pass filters are located on the base body and spaced each other by a metal plate; the multiplexer port, first and second ports are positioned on lateral side of the base body. The blocking capacitors are contained in the coaxial chamber of the two coaxial harmonic oscillator type band pass filters. The cover plate is secured on the base body; the first and second direct current circuits are placed on the cover plate; the low pass filters of the first and second direct current circuits are fixed on an edge of a top surface of the coaxial chamber by means of a support member; the cover body and the base body are fastened with each other. The blocking capacitors each are of distributed parameter capacitor. Utilization of distributed blocking capacitors makes the product of the invention small. Moreover, improvement of the structure of the invention brings effect such as less differential loss, large power capacity, as well as high isolation degree between circuits.11-04-2010
20120033683Method and Receiver For Jointly Decoding Received Communication Signals Using Maximum Likelihood Detection - The present invention relates to a method in a receiver for decoding at least two received communication signals, wherein the communication signals are modulated, pre-coded by a discrete Fourier transform and transmitted by means of single-carrier frequency division multiple access scheme (SC-FDMA). The method comprises the steps of: performing an antenna combining and equalization on a signal observed at the receiver; performing inverse discrete Fourier transform on a model of the observed signal; whitening a time domain model of the observed signal; and jointly detecting the received at least two communication signals by performing soft value calculations based on maximum likelihood detection of a whitened time domain model using a whitened time domain channel estimate.02-09-2012
20120063471Public Cavity Input Multiplexer - The present invention relates to a public cavity input multiplexer that is used to divide broadband signals into multi-channel narrowband signals according to the frequency and includes a public cavity and at least two channel filters. The public cavity is a broadband resonator that is used to input broadband signals, and is coupled with each of the channel filters respectively. In the input multiplexer of the present invention, no electric cable or waveguide and circulator are used for connection. The integrated design is achieved by establishing the public cavity and the channel filter, which reduces volume and mass, avoids the errors caused by influence on the circulator due to temperature change, enhances reliability, saves cost, and improves the electric performance. The design of the public cavity makes the input coupling accurate to calculate, convenient tuning and optimizes the consistency of channels.03-15-2012
20120076158METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DATA IN SINGLE CARRIER FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM - The present invention provides a method for transmitting and receiving data in a single carrier frequency division multiple access system to which a precoding matrix is applied, and to a transmitting/receiving apparatus for same. The method for transmitting data comprises the steps of: applying selected mapping algorithm (SLM) sequences of an SLM sequence subset corresponding to a precoding matrix, to respective data; selecting the SLM sequence in which each of the applied data has the smallest peak to average power ratio (PAPR) value; and transmitting the index of the selected SLM sequence and data to which the selected SLM sequence is applied. The method for receiving data, to which a precoding matrix is applied, comprises the steps of: receiving the index of the SLM sequence selected from the SLM sequence subset corresponding to the precoding matrix, and data to which the selected SLM sequence is applied; and removing the SLM sequence from the data to which the SLM sequence is applied using the SLM sequence indicated by the index, in order to recover data.03-29-2012

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