-
公开(公告)号：RU2433552C2
公开(公告)日：2011-11-10
申请号：RU2008150479
申请日：2007-05-22
Applicant: QUALCOMM INC
Inventor： UOLTON DZH RODNI , UOLLEHJS MARK S , MEDVEDEV IRINA , GOVARD STIVEN DZH
IPC: H04L27/26
Abstract: Изобретениеотноситсяк связии можетиспользоватьсядляфазовойкоррекциив системахбеспроводнойсвязи. Достигаемыйтехническийрезультат - удалениефазовыхошибок. Предложеныспособи устройствовыполненияфазовойкоррекциидлябеспроводнойсвязи. Принятыепилотныесимволыи принятыесимволыданныхмогутбытьполученыизпередачис мультиплексированиемс ортогональнымчастотнымразделениемканалов (OFDM) и/илипередачис множественнымивходами/выходами (MIMO). Первуюфазовуюинформациюполучают, основываясьнапринятыхпилотныхсимволахотпервогонабораподнесущихв текущемпериодесимвола, вторуюфазовуюинформациюполучаютотпринятыхсимволовданныхотвторогонабораподнесущихв текущемпериодесимвола, корректируютфазупринятыхсимволовданныхв текущемпериодесимволанаосновепервойфазовойинформации, корректируютфазупринятыхсимволовданныхв последующемпериодесимвола, основываясьнавторойинформациио фазовойошибке. 13 н. и 38 з.п. ф-лы, 12 ил.
-
公开(公告)号：SG170762A1
公开(公告)日：2011-05-30
申请号：SG2011020930
申请日：2006-06-15
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , MEDVEDEV IRINA
IPC: H04J99/00
Abstract: Techniques for transmitting multiple data streams to a single receiver using a single code rate and different modulation schemes are described. Channel estimates are determined for the multiple data streams and used to select a single code rate and multiple modulation schemes for the multiple data streams. The system may support a set of code rates, and each code rate may be associated with a respective set of modulation schemes that may be used with that code rate. The single code rate for all data streams is selected from among the set of supported code rates, and the modulation scheme for each data stream is selected from among the set of modulation schemes associated with the single code rate. The multiple data streams are encoded in accordance with the single code rate. Each data stream is further modulated in accordance with the modulation scheme selected for that stream.
-
公开(公告)号：RU2414062C2
公开(公告)日：2011-03-10
申请号：RU2008124818
申请日：2006-11-20
Applicant: QUALCOMM INC
Inventor： B ERKE B ERN , MEDVEDEV IRINA , KETCHUM DZHON U , UOLLEHJS MARK S , UOLTON DZHEJ RODNI
IPC: H04B7/08
Abstract: Изобретениеотноситсяк техникесвязии можетбытьиспользованов приемникахсистембеспроводнойсвязи. Водномвариантевоплощенияприемникполучает R принятыхпотоковсимволовдляМ потоковданных, выполняетпространственнуюобработкуприеманадпринятымисимволамидляполучениядетектированныхсимволов, выполняетвычислениелогарифмическихотношенийправдоподобия (LLR) независимодлякаждогоиз D наилучшихпотоковданныхи выполняетвычислениелогарифмическогоотношенияправдоподобия (LLR) совместнодля M-D оставшихсяпотоковданных, где M>D≥1 иМ>1. D наилучшихпотоковданныхмогутбытьвыбранынаосновеотношениясигналак шуму (SNR) и/илидругихкритериев. Вдругомвариантевоплощенияприемниквыполняетвычислениелогарифмическогоотношенияправдоподобия (LLR) независимодлякаждогоиз D наилучшихпотоковданных, выполняетвычисление LLR совместнодля M-D оставшихсяпотоковданныхи сокращаетколичестворассматриваемыхгипотездлясовместноговычисления LLR посредствомвыполненияпоискаподходящихгипотезс использованиемобнаружениясферысписка, методаМонте-Карлос использованиемцепейМарковаиликакой-либодругойметодикипоиска. Техническийрезультат - уменьшениесложностидетектированияи декодированияприобеспечениихорошейпроизводительности. 10 н. и 38 з.п. ф-лы, 9 ил., 2 табл.
-
公开(公告)号：SG163510A1
公开(公告)日：2010-08-30
申请号：SG2010042646
申请日：2006-06-15
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , MEDVEDEV IRINA
IPC: H04J99/00
Abstract: Techniques for transmitting multiple data streams to a single receiver using a single code rate and different modulation schemes are described. Channel estimates are determined for the multiple data streams and used to select a single code rate and multiple modulation schemes for the multiple data streams. The system may support a set of code rates, and each code rate may be associated with a respective set of modulation schemes that may be used with that code rate. The single code rate for all data streams is selected from among the set of supported code rates, and the modulation scheme for each data stream is selected from among the set of modulation schemes associated with the single code rate. The multiple data streams are encoded in accordance with the single code rate. Each data stream is further modulated in accordance with the modulation scheme selected for that stream.
-
公开(公告)号：DE602005019072D1
公开(公告)日：2010-03-11
申请号：DE602005019072
申请日：2005-09-02
Applicant: QUALCOMM INC
Inventor： WALLACE MARK S , MEDVEDEV IRINA , WALTON JAY RODNEY
Abstract: A receiving entity obtains received symbols for a data transmission having at least one data symbol stream sent with space-time transmit diversity (STTD). The receiving entity derives an overall channel response matrix in accordance with the STTD encoding scheme used for the data transmission, derives a spatial filter matrix based on the overall channel response matrix, and performs spatial matched filtering on a vector of received symbols for each 2-symbol interval to obtain a vector of detected symbols for the 2-symbol interval. The receiving entity may perform post-processing (e.g., conjugation) on the detected symbols if needed. Alternatively, the receiving entity derives a spatial filter matrix based on an effective channel response matrix, performs spatial matched filtering on the received symbols for each symbol period to obtain detected symbols for that symbol period, and combines multiple estimates obtained for each data symbol sent with STTD.
-
Patent Agency Ranking
公开(公告)号：DE60316663T2
公开(公告)日：2008-07-17
申请号：DE60316663
申请日：2003-01-22
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON JAY ROD , KETCHUM JOHN W
Abstract: Techniques to allocate the total transmit power to the transmission channels in a multi-channel communication system such that higher overall system spectral efficiency and/or other benefits may be achieved. The total transmit power may be initially allocated to the transmission channels based on a particular power allocation scheme (e.g., the water-filling scheme). The initial allocation may result in more power being allocated to some transmission channels than needed to achieve the required SNR (e.g., the SNR needed to achieve the maximum allowed data rate), which would then result in these transmission channels being operated in the saturation region. In such situations, the techniques reallocate the excess transmit power of transmission channels operated in the saturation region to other transmission channels operated below the saturation region. In this way, higher data rate may be achieved for the "poorer" transmission channels without sacrificing the performance of the "better" transmission channels.
-
公开(公告)号：AT375034T
公开(公告)日：2007-10-15
申请号：AT03707488
申请日：2003-01-22
Applicant: QUALCOMM INC
Inventor： MEDVEDEV IRINA , WALTON JAY , KETCHUM JOHN
Abstract: Techniques to allocate the total transmit power to the transmission channels in a multi-channel communication system such that higher overall system spectral efficiency and/or other benefits may be achieved. The total transmit power may be initially allocated to the transmission channels based on a particular power allocation scheme (e.g., the water-filling scheme). The initial allocation may result in more power being allocated to some transmission channels than needed to achieve the required SNR (e.g., the SNR needed to achieve the maximum allowed data rate), which would then result in these transmission channels being operated in the saturation region. In such situations, the techniques reallocate the excess transmit power of transmission channels operated in the saturation region to other transmission channels operated below the saturation region. In this way, higher data rate may be achieved for the "poorer" transmission channels without sacrificing the performance of the "better" transmission channels.
-
公开(公告)号：CA2628742A1
公开(公告)日：2007-05-31
申请号：CA2628742
申请日：2006-11-20
Applicant: QUALCOMM INC
Inventor： WALLACE MARK S , KETCHUM JOHN W , WALTON JAY RODNEY , BJERKE BJORN , MEDVEDEV IRINA
Abstract: Techniques for performing detection and decoding at a receiver are described. In one scheme, the receiver obtains R received symbol streams for M data streams transmitted by a transmitter, performs receiver spatial processing on the received symbols to obtain detected symbols, performs log-likelihood ratio (LLR) computation independently for each of D best data streams, and performs LLR computation jointly for the M - D remaining data streams, where M > D ¥ 1 and M > 1. The D best data streams may be selected based on SNR and/or other criteria. In another scheme, the receiver performs LLR computation independently for each of the D best data streams, performs LLR computation jointly for the M - D remaining data streams, and reduces the number of hypotheses to consider for the joint LLR computation by performing a search for candidate hypotheses using list sphere detection, Markov chain Monte Carlo, or some other search technique.
-
公开(公告)号：BR0215494A
公开(公告)日：2007-03-06
申请号：BR0215494
申请日：2002-12-31
Applicant: QUALCOMM INC
Inventor： WALTON JAY ROD , KETCHUM JOHN W , WALLACE MARK , MEDVEDEV IRINA
Abstract: Techniques to schedule terminals for data transmission on the downlink and/or uplink in a MIMO-OFDM system based on the spatial and/or frequency "signatures" of the terminals. A scheduler forms one or more sets of terminals for possible (downlink or uplink) data transmission for each of a number of frequency bands. One or more subhypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to (1) specific assignments of transmit antennas to the terminal(s) in the hypothesis (for the downlinks) or (2) a specific order for processing the uplink data transmissions from the terminal(s) (for the uplink). The performance of each sub-hypothesis is then evaluated (e.g., based on one or more performance metrics).; One sub-hypothesis is then selected for each frequency band based on the evaluated performance, and the one or more terminals in each selected sub-hypothesis are then scheduled for data transmission on the corresponding frequency band.
-
公开(公告)号：CA2611950A1
公开(公告)日：2006-12-28
申请号：CA2611950
申请日：2006-06-15
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , MEDVEDEV IRINA
Abstract: Techniques for transmitting multiple data streams to a single receiver using a single code rate and different modulation schemes are described. Channel estimates are determined for the multiple data streams and used to select a single code rate and multiple modulation schemes for the multiple data streams. The system may support a set of code rates, and each code rate may be associated with a respective set of modulation schemes that may be used with that code rate. The single code rate for all data streams is selected from among the set of supported code rates, and the modulation scheme for each da ta stream is selected from among the set of modulation schemes associated with the single code rate. The multiple data streams are encoded in accordance wi th the single code rate. Each data stream is further modulated in accordance wi th the modulation scheme selected for that stream.
-
-
-
-
-
-
-
-
-
Search Results
92
records
(took 0.025 seconds)
