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 |
20080232236 | METHOD AND APPARATUS FOR CHANNEL ESTIMATION OF OFDM WITH FREQUENCY INSERTED PILOTS - In an OFDM system having guard intervals interposed between symbols or frames, and having pilot signals distributed within the symbols or frames, a method for channel estimation is provided. The method comprising the steps of: in the time domain, performing an operation to obtain only a set of received pilots; and sectionalizing or subdividing the set of received pilots into a plurality of sub-sections; whereby a refined channel estimation is obtained on a sub-sectional basis. | 09-25-2008 |
20080232237 | METHOD AND APPARATUS FOR ROBUST TIMING RECOVERY OF OFDM SYSTEM FOR FAST FADING CHANNELS - In an orthogonal frequency division multiplex (OFDM) communication system, a method comprising the step of performing time estimation in a time domain. | 09-25-2008 |
20080232450 | METHOD AND APPARATUS FOR ROBUST FREQUENCY EQUALIZATION - In frequency equalization, a received signals goes through frequency transform, the transformed signal is divided by a frequency transform of a channel response a method for equalization. The method comprises the step of: adjusting a quotient of the division by a weight function, wherein the function varies under a set of conditions; whereby for a frequency selective channel, deep fades are adjusted, and noise or interference are reduced. | 09-25-2008 |
20080232451 | METHOD AND APPARATUS FOR EQUALIZATION OF FAST CHANGING CHANNELS IN A TDS-OFDM SYSTEM - A method for channel equalization is provided. The method comprises the steps of: subdividing a received symbol portion into segments wherein each segment is associated with a known, segmented channel characteristic among a set of segmented, known channel characteristics spanning the received symbol. | 09-25-2008 |
20080232481 | METHOD AND APPARATUS FOR CHANNEL INTERPOLATION IN A TDS-OFDM SYSTEM OR DVB T/H SYSTEM - In an OFDM system, a method for interpolating comprising the steps of: subdividing at least one frame among a plurality of frames into segments; and using at least two known quantities to interpolate a corresponding estimate. | 09-25-2008 |
20080232482 | METHOD AND APPARATUS FOR CONSTRUCTING RECEIVER DIVERSITY FOR OFDM SIGNALS - In an orthogonal frequency division multiplex (OFDM) communication system, a method at a receiver end is provided. The method comprises the steps of: providing a frame; providing a guard interval (GI) associated with the frame, the GI having a length in a time domain larger or longer than a channel span; and extracting OFDM information comprising a first OFDM information starting from a first point after the channel span to a first end point within the frame. | 09-25-2008 |
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 |
20080232519 | METHOD AND APPARATUS FOR COMPENSATING CHANNEL CHANGES FOR FAST FADING CHANNELS - A method for compensating channel changes in an OFDM system is provided. The method comprises the steps of: providing at least two PN sequences; and using the parameters of the at least two PN sequences for determining a set of compensated values of data disposed between the at least two PN sequences. | 09-25-2008 |
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 |
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 |
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 |
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 |
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 |