Class / Patent application number | Description | Number of patent applications / Date published |
370204000 | Plural diverse modulation techniques | 17 |
20080205258 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING MAP INFORMATION IN A COMMUNICATION SYSTEM - A method and apparatus for transmitting and receiving MAP information in a communication system are provided. A base station acquires channel quality information of each mobile station, generates sub-MAPs using MAP information, to which at least one of a coding scheme, a modulation scheme and a repetition scheme is applied, separately for each mobile station according to the channel quality information, and transmits the generated sub-MAPs. A mobile station receives MAP information from the base station, detects a sub-MAP allocated to the mobile station from the received MAP information, and restores the detected sub-MAP to MAP information using at least one of a corresponding decoding scheme, demodulation scheme and repetition scheme corresponding to coding scheme, modulation scheme and repetition scheme applied in the base station, based on channel quality information of the mobile station. Accordingly, system overhead can be reduced. | 08-28-2008 |
20080247306 | COMPANDED TRANSMIT PATH FOR WIRLESS COMMUNICATION - This disclosure describes companded transmit path techniques that may be implemented in a wireless communication device to reduce power consumption and possibly simplify signal modulation. In accordance with this disclosure, in phase (I) and quadrature phase (Q) components of a transmit waveform are compressed at baseband, and an emphasis envelope is generated to represent this compression. The compressed I and Q components are then converted to analog signals and processed. This analog processing may include the mixing process in which the compressed I and Q signals are modulated onto a carrier waveform. The emphasis envelope signal is then used to expand the modulated waveform. | 10-09-2008 |
20080253278 | Techniques to Compress Modulation Patterns for Adaptive Bitloading - An embodiment of the present invention provides a method, comprising using a predetermined limited set of modulation patterns to perform adaptive bit loading (ABL) to compress the modulation patterns in wireless communications. | 10-16-2008 |
20080285433 | REFERENCE SEQUENCE CONSTRUCTION FOR FAST CELL SEARCH - A method and apparatus for fast cell search based on a chirp reference signal transmission is disclosed herein. A primary synchronization channel (P-SCH) and two secondary synchronization channels (S-SCH | 11-20-2008 |
20080298224 | Methods and apparatus for mapping modulation symbols to resources in OFDM systems - A method for transmission, by dividing a transmission resource in a time domain subframe into a plurality of equal duration resource elements in a time and frequency domain, segregating the plurality of resource elements into a plurality of resource regions, modulating information to be transmitted to generate a sequence of modulation symbols at a transmitter, mapping the sequence of modulation symbols into the plurality of resource elements in the plurality of resource regions, and transmitting the modulation symbols via a plurality of antennas using the respective corresponding resource elements to a receiver. The mapping of the modulation symbols in at least one resource region is independent of a certain control channel information that is carried in said time domain subframe, and the mapping of the modulation symbols in at least another resource region is dependent upon said certain control channel information that is carried in said subframe. The information to be transmitted may be encoded to generate a plurality of code blocks, with roughly equal number of resource elements assigned to each of the plurality of code blocks in at least one resource region. Alternatively, the time domain subframe may contain only one resource region. | 12-04-2008 |
20090196163 | BANDWIDTH ASYMMETRIC COMMUNICATION SYSTEM BASED ON OFDM AND TDMA - The present invention relates to a communication system comprising a plurality of terminals each having an uplink transmission unit ( | 08-06-2009 |
20090245083 | ADAPTIVE TRANSMISSIONS FOR OPTIMIZED APPLICATION DELIVERY IN WIRELESS NETWORKS - Methods and devices of the invention relate to sending information over a wireless communications channel using an adaptive frame structure (AFS) having unequal error protection. Unequal error protection relates to a first data region of the frame being modulated with a first modulation and coding scheme (MCS) and a second data region of the frame being modulated with a different MCS typically with a higher modulation order. The first data region, modulated with a lower order MCS, may include critical data such as error checking and header/router information while the second region may include data payload for loss tolerant applications such as voice over Internet protocol (VoIP). | 10-01-2009 |
20100039925 | METHOD OF DETERMINING THE LOCATION OF THE FFT WINDOW AND THE DELAY SPREAD FOR THE PLATINUM BROADCAST CHANNEL ESTIMATOR - In one embodiment, the invention comprises a channel estimation method, comprising determining a FFT window position, and calculating a delay spread. In another embodiment, the step of determining a FFT window position comprises setting an initial position of the FFT window, computing an energy for each tap, time averaging said energy for each tap, comparing an average energy of each tap with a first threshold multiplied by the average energy of all taps, comparing the average energy of each tap with a second threshold multiplied by a maximum average energy in alias components, updating the set of paths if the average energy of the tap is greater than said second threshold multiplied by the maximum average energy in alias components; and refining the FFT window position. | 02-18-2010 |
20100103810 | MODULATION CODING SCHEME SELECTION IN A WIRELESS COMMUNICATION SYSTEM - A base station and method for selecting a modulation coding scheme (MCS) in an OFDM communication system, includes a first step | 04-29-2010 |
20100110872 | Adaptive modulation for fixed wireless link in cable transmission system - In one embodiment of a communications network, the predetermined encoding scheme and symbol constellation configurations are chosen so that the range in channel qualities that the encoding scheme and symbol constellation configurations are designed to be utilized within overlap with each other. This overlapping provides hysteresis, which reduces the frequency with which a subscriber must alter encoding scheme and symbol constellations. Reducing the frequency of changing encoding scheme and/or symbol constellation eliminates the communication overhead associated with these changes and increases throughput by enabling the subscriber to spend more time transmitting data. | 05-06-2010 |
20100149961 | METHOD OFTRANSMITTING AND PROCESSING DATA AND TRANSMITTER IN A WIRELESS COMMUNICATION SYSTEM - A method for transmitting/processing data in a wireless communication system, and a transmitter are disclosed. A method processing method for data transmission at a transmitting side of a wireless communication system employing multiple carriers comprises performing a symbol mapping process on a binary data sequence, and generating a symbol sequence, converting the symbol sequence into a time-domain symbol using a plurality of sub-carriers having a variable sub-carrier spacing therebetween, and adding a cyclic prefix to the time-domain symbol. | 06-17-2010 |
20100265814 | SEQUENTIAL TRANSMISSION METHOD - Provided is a sequential allocation method which can reduce mutual correlation between different sequential groups while maintaining a number of sequential groups. ST | 10-21-2010 |
20110149715 | MIMO CONTROL SIGNALING IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method for data transmission in a communication system. The method includes determining, at the transmitter, whether to transmit data signal using a single codeword or two codewords. When it is determined that the single codeword transmission is used, coding, by the transmitter, a control signal by using a first signal format, with the control signal coded by the first signal format carrying information regarding the single codeword. When it is determined that the two codewords transmission is used, coding, by the transmitter, the control signal by using a second signal format, with the control signal coded by the second signal format carrying information regarding both of the two codewords. The method also includes transmitting the data signal and the control signal according to the determined transmission format from the transmitter to the receiver. | 06-23-2011 |
20120263031 | METHODS AND SYSTEMS FOR COMMUNICATING - Methods and systems for communicating are disclosed. A method includes obtaining input communication symbols selected from a set of communication symbols, converting input communication symbols into transmittable waveforms using non-periodic functions, and transmitting transmittable waveforms over a communication channel. Another method includes receiving transmittable waveforms constructed using non-periodic functions and transmitted over a communication channel, and demodulating transmittable waveforms. A system includes a modulator adapted to obtain input communication symbols selected from a set of communication symbols and adapted to convert input communication symbols into transmittable waveforms using non-periodic functions, and a transmitter or transceiver adapted to transmit transmittable waveforms over a communication channel. Another system includes a receiver or transceiver adapted to receive transmittable waveforms transmitted over a communication channel and constructed using non-periodic functions, and a demodulator adapted to demodulate transmittable waveforms. | 10-18-2012 |
20140269249 | Method for Sending Downlink Data, Method for Receiving Downlink Data, Base Station, and User Terminal - Embodiments of the present invention provide a method for sending downlink data, a method for receiving downlink data, a base station, and a user terminal. The sending method includes modulating first downlink data into a first downlink signal by using a DFT-S-OFDM modulation mode; modulating second downlink data into a second downlink signal by using an OFDM modulation mode; and forming a downlink transmit signal from the first downlink signal and the second downlink signal in a multiplexing manner, and sending the downlink transmit signal to a user terminal. The base station includes a first generation module, a second generation module, and a first sending module. In the technical solutions of the present invention, downlink data is sent by using two modulation modes, DFT-S-OFDM and OFDM, thereby meeting requirements of different downlink data on EVM indexes. | 09-18-2014 |
20150341200 | DUAL RE-CONFIGURABLE LOGIC DEVICES FOR MIMO-OFDM COMMUNICATION SYSTEMS - An apparatus and method for dual re-configurable logic devices for MIMO-OFDM communication systems. The apparatus includes two FPGA devices, wherein the FPGA | 11-26-2015 |
370205000 | Pulse width and pulse position modulation | 1 |
20110149716 | APPARATUS AND METHOD FOR TRANSMITTING A SUB-CHANNEL SIGNAL IN A COMMUNICATION SYSTEM USING AN ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS SCHEME - Methods of transmitting an receiving symbols by a Mobile Subscriber Station (MSS) and a Base Station (BS) are provided. The method for receiving symbols by the MSS includes receiving symbols from the BS, wherein the symbols are mapped onto data sub-carriers using a sequence, wherein the sequence includes result values, the result values being generated by applying, to a basic sequence, an offset and a number of cyclic shifting, the basic sequence having a length identical to the number of data sub-carriers. The method for transmitting symbols by the MSS includes transmitting symbols to the BS, wherein the symbols are mapped onto data sub-carriers using a sequence, wherein the sequence includes result values, the result values being generated by applying, to a basic sequence, an offset and a number of cyclic shifting, the basic sequence having a length identical to the number of data sub-carriers. | 06-23-2011 |