Patent application number | Description | Published |
20080225694 | METHOD AND APPARATUS FOR ID IDENTIFICATION USING PN FOR TDS-OFDM IN TRANSMISSION - In an OFDM system having PN sequences as guard intervals, a method is used for synchronization. The method comprises the steps of: providing a plurality of base stations; providing a plurality of mobile stations; both the base stations and the mobile stations are adapted to transmit and receive signals associated with a parameter using the PN sequences for synchronization. | 09-18-2008 |
20080225967 | METHOD AND APPARATUS FOR MIMO CHANNEL ESTIMATION USING TDS-OFDM IN DOWNLINK TRANSMISSION IN THE TIME DOMAIN - In an orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) wireless communication system, a method is provided. In the OFDM MIMO wireless communication system, both a transmitter and a receiver include a plurality of antennas. The method comprising the step of: a receiver using at least one pseudo noise (PN) to correlate desired information relating to a received symbol; and performing channel estimation using the correlated information. | 09-18-2008 |
20080225968 | METHOD AND APPARATUS FOR MIMO CHANNEL ESTIMATION USING TDS-OFDM IN DOWNLINK TRANSMISSION IN THE FREQUENCY DOMAIN - In an orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) wireless communication system where both a transmitter and a receiver include a plurality of antennas, a method comprising the steps of: a receiver using at least one pseudo noise (PN) to associate desired information relating to a received symbol; and transforming the correlated information into frequency domain. | 09-18-2008 |
20080225969 | METHOD AND APPARATUS FOR ADAPTIVE PN LENGTH FOR TDS-OFDM IN TRANSMISSION - In a TDS-OFDM system, a method for transmission is provided. The method comprises the step of: adjusting a PN sequence length, whereby a required performance is maintained. The adjusting step comprises increasing, decreasing, or keep unchanging the PN sequence length. | 09-18-2008 |
20080225977 | METHOD AND APPARATUS FOR MIMO CHANNEL ESTIMATION IN A TDS-OFDM SYSTEM DOWNLINK USING A SUB-SPACE ALGORITHM IN THE FREQUENCY DOMAIN - In an orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) wireless communication system, a method is provided for channel estimation using a sub-space method suitable for computer implementation. The system has both a transmitter and a receiver including a plurality of antennas. The method comprising the step of: a receiver using at least one pseudo noise (PN) to correlate desired information relating to a received symbol; transforming the correlated information into frequency domain; and performing channel estimation using a sub-space method suitable for computer implementation. | 09-18-2008 |
20080225978 | METHOD AND APPARATUS FOR SYNCHRONIZATION FOR MIMO TDS-OFDM SYSTEM - In an orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) wireless communication system where both a transmitter and a receiver include a plurality of antennas, a method comprising the step of: a receiver using at least one pseudo noise (PN) to correlate desired information relating to a received symbol. | 09-18-2008 |
20080225997 | METHOD AND APPARATUS FOR SYNCHRONIZATION FOR MIMO TDS-OFDM SYSTEM - In a TDS-OFDM system, frequency offset estimate provided. A method for estimating a frequency offset comprising the step of correlating a known PN sequence with a received signal. | 09-18-2008 |
20080226007 | METHOD AND APPARATUS FOR POWER ESTIMATION FOR TDSOFDM IN TRANSMISSION - A method and apparatus for a receiver to estimate the received power for each transmitting BS. The power measure can be obtained by using some or all receiving antennas. | 09-18-2008 |
20080232483 | METHOD AND APPARATUS FOR EQUALIZATION OF TDS-OFDM SIGNALS - In an OFDM system having pseudo-noise (PN) sequences as guard intervals, a method for channel estimation and equalization is provided. The method comprising the steps of: providing a frequency equalization scheme; providing a time domain filter; and combining the frequency equalization with time-domain filter, thereby a time lag effect is taken into consideration for the channel estimation and equalization. | 09-25-2008 |
20080247473 | MULTIPLE SUB-BANDS TDS-OFDM TRANSMISSION SCHEME - An OFDM system is provided. The system comprises: a single symbol among a series of symbols comprising; and a series PN sequences interposed between the series of symbols, with at least one PN sequence comprising a set of PN sub-sequences, wherein each PN sub-sequence is respectively associated with an ordered sub-central frequency within the single symbol. | 10-09-2008 |
20080273080 | METHOD AND APPARATUS FOR DECISION FEEDBACK LOCATIONING USING DIGTITAL TELELVISION SIGNALS - A method using DTV signals for positioning is provided. The method comprises the step of calculating a transmission time of a data segment of a television signal from a transmitter to a mobile receiver. | 11-06-2008 |
20080273643 | APPARATUS AND METHOD OF EXACT TIME FRAMING IN A DMB-TH TRANSMITTER - A transmitter comprising: a digital encoder for encoding incoming digital information; and a digital to analog converter for converting the encoded digital information into analog information is described. The transmitter further comprises an exact time framing block disposed between the digital encoder and the digital to analog converter. The exact time framing block receives the digitally encoded information and comprises a method for synchronization. The method including the steps of: providing a clock signal having at least two adjacent pulses; providing information subjected to transmission in the form of a set of frames; and accommodating a whole number of frames between the two adjacent pulses. | 11-06-2008 |
20080279148 | TDS-OFDMA COMMUNICATION SYSTEM USER IDENTIFICATION - In a TDS-OFDM communications system for uplink wireless communication multiple accesses through sub-channelization, the system comprising: a plurality of users with each user using a portion of available time-frequency radio resources to achieve orthogonal multiple access; a plurality of available bandwidth, wherein the available bandwidth is divided into multiple sub-bands; at least one the sub-carrier in each sub-band. Inside the sub-band for each user, at least one guard sequence, being used as the guard interval between transmitted symbols. | 11-13-2008 |
20080279294 | TDS-OFDMAA COMMUNICATION SYSTEM UPLINK FREQUENCY SYNCHRONIZATION - TDS-OFDM can be applied to uplink wireless communication multiple accesses through sub-channelization, which means that each user uses a portion of available bandwidth to achieve orthogonal multiple access, where the sub-carriers in each sub-band may be contiguous or distributed. Inside the bandwidth for each user, at least one random or known sequence is used as the guard interval between transmitted symbols, where the sequence is limited inside the sub-band. | 11-13-2008 |
20080279295 | TDS-OFDMA COMMUNICATION SYSTEM UPLINK TIMING SYNCHRONIZATION - In a TDS-OFDM communications system for uplink wireless communication multiple accesses through sub-channelization, the system comprising: a plurality of users with each user using a portion of available time-frequency radio resources to achieve orthogonal multiple access; a plurality of available bandwidth, wherein the available bandwidth is divided into multiple sub-bands; at least one the sub-carrier in each sub-band. Inside the sub-band for each user, at least one guard sequence, being used as the guard interval between transmitted symbols. | 11-13-2008 |
20090005084 | METHOD AND APPARATUS FOR POSITIONNG USING ATSC DIGITAL TV SIGNALS - An apparatus for positioning comprising a method is provided. The method includes the step of calculating a transmission time of a training sequence of a television signal from a transmitter to a mobile receiver. | 01-01-2009 |
20090009396 | METHOD AND APPARATUS FOR LOCATIONING USING DVB-T DIGITAL TELEVISION SIGNALS - A receiver for positioning using DTV signals is provided. The receiver comprises the step of calculating a transmission time of at least one pilot signal among a plurality of pilot signals disposed within a digital television (DTV) signal or information originating from a transmitter and transmitted to a mobile receiver. | 01-08-2009 |
20090010345 | TDS-OFDMA COMMUNICATION CLOSED-LOOP POWER CONTROL - In a TDS-OFDMA communications system, a frame structure comprising: a frame such that within a frame time, a transmitted signal comprising a preamble, a downlink sub-frame, and an uplink sub-frame; and interposed between OFDM symbols are guard intervals comprising known sequences being used for an estimation of a received power. | 01-08-2009 |
20090010346 | TDS-OFDMA Communication System - In a TDS-OFDM communications system, a frame structure comprising: a frame such that within a frame time, a transmitted signal comprising a preamble, a downlink sub-frame, and an uplink sub-frame is provided. | 01-08-2009 |
20090010347 | TDS-OFDMA Communication Open-Loop Power Control - In a TDS-OFDM communications system, within a frame time, a transmitted signal comprising a preamble, a downlink sub-frame, and an uplink sub-frame. Within the downlink sub-frame, interposed between sub-frames are guard intervals comprising known sequences. The known sequences are used for an estimation of a received power. A method comprising the step of using a guard sequence in a guard interval of OFDM symbols of the received TDS-OFDM signals in the downlink to estimate a received signal power or an interference power is provided. | 01-08-2009 |
20090010361 | METHOD AND APPARATUS FOR LOCATIONING USING THE GUARD INTERVALS OF TDS-OFDM DIGITAL TELEVISION SIGNALS - A TDS-OFDM receiver for positioning using guard intervals comprising PN sequences is provided. The receiver comprises the step of calculating a transmission time of at least one PN among a plurality of PNs in a digital television (DTV) signal or information originating from a transmitter and transmitted to a mobile receiver. | 01-08-2009 |
20090103600 | MOBILE RECEIVER EQUALIZER STRUCTURE FOR USE IN THE ATSC STANDARD - A receiving device is provided that comprises: a channel estimator adapted to receive an input; and an equalizer adapted to receive the input and generate an equalized output, wherein the equalized output is used by the channel estimator for at least one subsequent channel estimation. | 04-23-2009 |
20090135935 | DIGITAL TV RECEIVER HAVING BUILT-IN DIVERSITY STRUCTURE - A receiver is provided that comprises: a channel estimator; a first path for feeding the estimated information into a frequency domain equalizer; a second path for feeding the estimated information into a time domain equalizer; and a combiner or selector to combine or select equalized information from the frequency domain equalizer and the time domain equalizer. | 05-28-2009 |
20090279619 | METHOD AND APPARATUS FOR CELL EDGE TRANSMISSION PERFORMANCE ENHANCEMENT FOR TDS-OFDM - In a communication system with multiple base stations having at least one base station with communications overlaps with at least another base station, a method is provided. The method comprising the steps of: characterizing the users into a first group and a second group, and adjusting some PN lengths of transmitted information for one group of users. The system includes users of a TDS-OFDM system, | 11-12-2009 |
20090282313 | METHOD AND APPARATUS FOR HARD DECISION BOUNDED DISTANCE DECODING OF NORDSTROM ROBINSON CODE - A receiver is provided that comprises a decoder. The decoder comprises: means for slicing a signal; means for encoding data/messages to a code word among a predetermined number of code words; and means for determining a distance associated with the code word. | 11-12-2009 |
20090316680 | TDS-OFDMA COMMUNICATION CINR ESTIMATION - In a TDS-OFDM communications system, within a frame time, a transmitted signal comprising a preamble, a downlink sub-frame, and an uplink sub-frame. Within the downlink sub-frame, interposed between sub-frames are guard intervals that have known sequences positioned therein. The known sequences are used for an estimation of a received power. A method comprising the step of using a guard sequence in a guard interval of OFDM symbols of the received TDS-OFDM signals in the downlink or the uplink to estimate a received signal power and using the estimated signal power to calculate a CINR is provided. | 12-24-2009 |
20090316804 | METHOD AND APPARATUS TO IMPLEMENT OFDMA RANGING IN WIMAX SYSTEM - A communications processing device includes a rotor for rotating information associated with ranging subchannels in some symbols; and a single inverse fast Fourier transformer (IFFT), coupled to rotor, for subjecting the rotated information to a single IFFT along with information from all other channels. A method comprising the steps of: rotating information associated with ranging subchannels in some symbols; and subjecting the rotated information to a single IFFT along with information from all other channels. | 12-24-2009 |
20100027614 | ERROR AWARENESS AND MEANS FOR REMEDYING SAME IN VIDEO DECODING - A DTV receiver having method using elastic decoding method is provided. The method comprises the steps of: receiving a signal for processing; decoding the signal using a source decoder; determining a portion of the signal that are problematic; and using elastic decoding to remedy the portion of the signal that are problematic. | 02-04-2010 |
20100031130 | FORWARD ERROR CORRECTION (FEC) AND VARIABLE LENGTH CODE (VLC) JOINT DECODING - A method for decoding is provided. The method comprises the step of: using information known to a channel decoder to determine a path between two data points, whereby reducing error or bad data effects. | 02-04-2010 |
20100062737 | METHOD AND APPARATUS FOR ANTENNA DIVERSITY RECEIVER BASED ON ATSC TECHNOLOGY - A receiver comprises a plurality of paths for receiving wireless signals, each path having a designated antenna; and an antenna diversity chain adapted for information communication between the plurality of paths for a selecting and using a path among the plurality of paths. | 03-11-2010 |
20100080275 | TRAINING OF THE NON-UPDATED DECISION FEEDBACK EQUALIZER FOR A 8-VSB RECEIVER - A method for training of a non-updated decision feedback equalizer is provided. The method comprising the steps of: providing a sequence of frames adapted to be received by a receiver; provide a sequence of synchronization frames interposed between a predetermined number of frames; and using at least part of the sequence of synchronization frames to train a decision feedback equalizer (DFE), thereby speeding up system convergence or making system convergence possible. | 04-01-2010 |
20100080276 | METHOD FOR NON-PILOT TONE DATA-AIDED CARRIER FREQUENCY TRACKING - A method comprising the steps of providing a slicer for slicing real values of an equalizer output; and cross correlating an equalizer input with an output of the slicer is provided. | 04-01-2010 |
20100080277 | USING CONJUGATE GRADIENT METHOD TO CALCULATE FILTER COEFFICIENT FOR TIME DOMAIN EQUALIZER - A method used in a time domain equalizer is provided. A method comprising the steps of: providing a time domain equalizer comprising a feed forward equalizer and a feedback equalizer; and using a conjugate gradient iteration in order to calculate a set of coefficients of the time domain equalizer. | 04-01-2010 |
20100080278 | FILTER STRUCTURE IMPLEMENTATION RELATING TO A LINEAR SYSTEM SOLUTION - A method used in a time domain equalizer is provided. A method comprising the steps of: providing a time domain equalizer comprising a feed forward equalizer and a feedback equalizer; and using a filter circuit or structured implementation to incorporate conjugate gradient iteration in order to calculate a set of coefficients of the time domain equalizer. Whereby matrix times vector operations is converted into filtering using the filter circuit. | 04-01-2010 |
20100080280 | DECISION FEEDBACK EQUALIZER WITH PARTIAL FEEDBACK EQUALIZER IN A VARIABLE SIDEBAND COMMUNICATIONS SYSTEM - In a receiver of a multi-leveled variable sideband communications system, a method is provided that comprises the steps of: dividing the receiver into a real portion and a complex portion; and providing a decision feedback equalizer (DFE) processing data substantially in the real portion. | 04-01-2010 |
20100080281 | METHOD TO CALCULATE THE REAL DECISION FEEDBACK EQUALIZER COEFFICIENTS - A method used in a time domain equalizer is provided. The method comprising the steps of: providing a time domain equalizer comprising; and extracting a real part of an input or a derivative of the input to the time domain equalizer and using the only real part of the input in the time domain equalizer to derive an output of the time domain equalizer. | 04-01-2010 |
20100082720 | CURVE-FITTING METHOD TO CALCULATE COARSE FREQUENCY OFFSET - A method comprising the steps of: providing a known sequence comprising a plurality of data points; and curve-fitting the plurality of data points to calculate coarse frequency offset. | 04-01-2010 |
20110026579 | NOVEL EQUALIZER FOR SINGLE CARRIER TERRESTRIAL DTV RECEIVER - An equalizer is provided. The equalizer comprises a frequency domain a minimum-mean square-error (MMSE) decision feedback equalization (DFE) block having a backward filter co-efficient (BFC) feature adapted to operate in a single carrier environment. | 02-03-2011 |
20110058600 | MULTIPLE TUNER ATSC TERRESTRIAL DTV RECEIVER FOR INDOOR AND MOBILE USERS - A device is provided. the device comprises a maximum ratio combining (FD-MRC-DFE), a first device down stream to the FD-MRC-DFE; and a second device upstream to the maximum ratio combining (FD-MRC-DFE) having a second point directly connected to a first point within the first device. The method for producing the device is also provided. | 03-10-2011 |
20110080526 | MULTIPLE TUNER TERRESTRIAL DTV RECEIVER FOR INDOOR AND MOBILE USERS - A device is provided. the device comprises A device comprising: a Frequency Domain Maximum Ratio Combining Decision Feedback Equalizer (FD-MRC-DFE), a first device down stream to the FD-MRC-DFE; a second device down stream to the FD-MRC-DFE; and a third device for averaging the outputs of the first device and the second device. | 04-07-2011 |