公开(公告)号：MXPA05002229A

公开(公告)日：2005-07-05

申请号：MXPA05002229

申请日：2003-08-19

Applicant: QUALCOMM INC

Inventor： MEDVEDEV IRINA

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06

Abstract: Se presentan tecnicas para llevar a cabo una inversion de canal selectiva por modo propio en un sistema MIMO para lograr una eficiencia de espectro superior, mientras que se reduce la complejidad tanto en el transmisor como en el receptor. Los canales de transmision disponibles estan ajustados en un numero de grupos, en donde cada grupo puede incluir todos los canales de transmision (o bins de frecuencia) de un modo propio respectivo de un canal MIMO. La potencia de transmision total se asigna a los grupos utilizando un esquema de afinacion de potencia de grupo en particular. Posteriormente se lleva a cabo la inversion de canal selectiva en forma independiente para cada grupo seleccionado para utilizarse para la transmision de datos. Para cada uno de dichos grupos, se seleccionan para uso, uno o mas canales de transmision en el grupo, y se determina un factor de escala para cada canal seleccionado de modo que todos los canales seleccionados del grupo logren una salida de senal recibida similar (por ejemplo, SNR recibida).

公开(公告)号：BR0307948A

公开(公告)日：2005-03-29

申请号：BR0307948

申请日：2003-02-19

Applicant: QUALCOMM INC

Inventor： MEDVEDEV IRINA ,  WALTON JAY R ,  WALLACE MARK

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

Abstract: Techniques to transmit data on a number of transmission channels in a multi-channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CSI transmission scheme that transmits a single data stream on each transmit antenna selected for use and a "beam-forming" transmission scheme that allocates all transmit power to a single transmission channel having the best performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs). These multiple transmission schemes may then be combined in a piece-wise fashion to form a "multi-mode" transmission scheme that covers the full range of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment would then be dependent on the specific operating condition experienced by the system at that moment.

公开(公告)号：AU2003265601A1

公开(公告)日：2004-03-19

申请号：AU2003265601

申请日：2003-08-19

Applicant: QUALCOMM INC

Inventor： MEDVEDEV IRINA ,  WALTON JAY ROD ,  KETCHUM JOHN W

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06

Abstract: Techniques to perform selective channel inversion per eigenmode in a MIMO system to achieve high spectral efficiency while reducing complexity at both the transmitter and receiver are presented. The available transmission channels are arranged into a number of groups, where each group may include all transmission channels (or frequency bins) for a respective eigenmode of a MIMO channel. The total transmit power is allocated to the groups using a particular group power allocation scheme. Selective channel inversion is then performed independently for each group selected for use for data transmission. For each such group, one or more transmission channels in the group are selected for use, and a scaling factor is determined for each selected channel such that all selected channels for the group achieve similar received signal quality (e.g., received SNR).

公开(公告)号：AU2003213217A8

公开(公告)日：2003-09-09

申请号：AU2003213217

申请日：2003-02-19

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  MEDVEDEV IRINA ,  WALTON JAY R

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04L1/00 ,  H04L1/06

Abstract: Techniques for controlling the transmit power for a number of data streams in a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMISC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed to achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit power for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.

公开(公告)号：AU2002360839A1

公开(公告)日：2003-07-24

申请号：AU2002360839

申请日：2002-12-31

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALLACE MARK ,  MEDVEDEV IRINA ,  WALTON JAY ROD

IPC: H04J99/00 ,  H04L1/06 ,  H04L5/02

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：WO2010033379A3

公开(公告)日：2010-07-15

申请号：PCT/US2009055686

申请日：2009-09-02

Applicant: QUALCOMM INC ,  MEDVEDEV IRINA ,  KETCHUM JOHN W ,  WALTON J RODNEY

Inventor： MEDVEDEV IRINA ,  KETCHUM JOHN W ,  WALTON J RODNEY

IPC: H04L1/00 ,  H04L1/06 ,  H04L1/20

CPC classification number: H04W24/02 ,  H04L1/0002 ,  H04L1/0016 ,  H04L1/0019 ,  H04L1/0025 ,  H04L1/06 ,  H04L1/20

Abstract: Techniques to select a suitable transmission mode for a data transmission in a multi channel communication system with multiple spatial channels having varying SNRs are presented in this disclosure. For certain embodiments, a closed-loop technique may be applied, in which back-off factors used to calculate an effective SNR value fed back to a transmitter are adjusted. An open-loop rate control scheme is also presented in which a transmitter may select a data rate and number of streams based on whether transmitted packets are received in error at a receiver.

Abstract translation: 在本公开中呈现了用于在具有变化的SNR的多个空间信道的多信道通信系统中为数据传输选择合适的传输模式的技术。 对于某些实施例，可应用闭环技术，其中调整用于计算反馈到发射机的有效SNR值的补偿因子。 还提出了一种开环速率控制方案，其中发射机可以基于在接收机处是否错误地接收到发送的分组来选择数据速率和数量的流。

公开(公告)号：WO2007137281A2

公开(公告)日：2007-11-29

申请号：PCT/US2007069501

申请日：2007-05-22

Applicant: QUALCOMM INC ,  WALTON J RODNEY ,  WALLACE MARK S ,  MEDVEDEV IRINA ,  HOWARD STEVEN J

Inventor： WALTON J RODNEY ,  WALLACE MARK S ,  MEDVEDEV IRINA ,  HOWARD STEVEN J

CPC classification number: H04L27/0014 ,  H04L1/0045 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/061 ,  H04L27/261 ,  H04L27/2657 ,  H04L27/2662 ,  H04L2027/0053 ,  H04L2027/0067 ,  H04L2027/0087

Abstract: Techniques for performing phase correction for wireless communication are described. Received pilot symbols and received data symbols may be obtained from an orthogonal frequency division multiplexing (OFDM) and/or multiple-input multiple-output (MIMO) transmission. First phase information is obtained based upon the received pilot symbols. Second phase information is obtained based upon the received data symbols. The phase of the received data symbols is corrected based upon the first and second phase information (directly and/or indirectly). For example, the phase of the received data symbols may be corrected based upon the first phase information, detection may be performed on the phase corrected data symbols to obtain estimated data symbols, the second phase information may be obtained based upon the estimated data symbols, and the phase of the estimated data symbols may be corrected based upon the second phase information. The phase correction may also be performed in other manners.

Abstract translation: 描述用于执行无线通信的相位校正的技术。 可以从正交频分复用（OFDM）和/或多输入多输出（MIMO）传输中获得接收到的导频符号和接收的数据符号。 基于接收到的导频符号获得第一相位信息。 基于接收到的数据符号获得第二相位信息。 基于第一和第二相位信息（直接和/或间接地）校正接收到的数据符号的相位。 例如，可以基于第一相位信息来校正接收到的数据符号的相位，可以对相位校正数据符号执行检测以获得估计的数据符号，可以基于估计的数据符号获得第二相位信息， 并且可以基于第二相位信息来校正估计数据符号的相位。 相位校正也可以以其他方式进行。

公开(公告)号：WO2007062021A2

公开(公告)日：2007-05-31

申请号：PCT/US2006045031

申请日：2006-11-20

Applicant: QUALCOMM INC ,  BJERKE BJORN ,  MEDVEDEV IRINA ,  KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON JAY RODNEY

Inventor： BJERKE BJORN ,  MEDVEDEV IRINA ,  KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON JAY RODNEY

IPC: H04B7/08 ,  H04B7/04 ,  H04L1/06 ,  H04L25/03

CPC classification number: H04L27/2647 ,  H04L1/005 ,  H04L1/0052 ,  H04L1/06 ,  H04L25/03171 ,  H04L2025/03414 ,  H04L2025/03426

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.

Abstract translation: 描述了在接收机上执行检测和解码的技术。 在一个方案中，接收器获得由发射器发送的针对M个数据流的R个接收符号流，对接收到的符号执行接收器空间处理以获得检测到的符号，针对D个最佳数据流中的每个独立地执行对数似然比（LLR）计算 并且针对MD剩余数据流联合执行LLR计算，其中M> D = 1并且M> 1。可以基于SNR和/或其它标准来选择D个最佳数据流。 在另一种方案中，接收机独立地为每个D个最佳数据流执行LLR计算，为MD剩余数据流共同执行LLR计算，并通过执行搜索候选假设来减少要考虑用于联合LLR计算的假设的数量 使用列表球检测，马尔可夫链蒙特卡罗或其他一些搜索技术。

公开(公告)号：WO2006138582A2

公开(公告)日：2006-12-28

申请号：PCT/US2006023515

申请日：2006-06-15

Applicant: QUALCOMM INC ,  WALTON JAY RODNEY ,  MEDVEDEV IRINA

Inventor： WALTON JAY RODNEY ,  MEDVEDEV IRINA

IPC: H04L1/02

CPC classification number: H04L1/0009 ,  H04L1/0003 ,  H04L1/06 ,  Y02D50/10

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.

Abstract translation: 描述了使用单个码率和不同调制方案将多个数据流发送到单个接收机的技术。 为多个数据流确定信道估计，并用于为多个数据流选择单个码率和多个调制方案。 该系统可以支持一组码率，并且每个码率可以与可以与该码率一起使用的相应的一组调制方案​​相关联。 从所支持的码率集合中选择所有数据流的单码率，并且从与单个码率相关联的调制方案组中选择每个数据流的调制方案。 多个数据流根据单码率进行编码。 根据为该流选择的调制方案进一步调制每个数据流。

公开(公告)号：WO2006124427A3

公开(公告)日：2007-10-18

申请号：PCT/US2006017992

申请日：2006-05-09

Applicant: QUALCOMM INC ,  MEDVEDEV IRINA ,  WALTON JAY RODNEY

Inventor： MEDVEDEV IRINA ,  WALTON JAY RODNEY

IPC: H04B7/216 ,  H04L1/00 ,  H04L12/26 ,  H04L25/08 ,  H04L25/52 ,  H04Q1/20 ,  H04Q7/24

CPC classification number: H04L1/0002 ,  H04B7/0413 ,  H04L1/0015 ,  Y02B60/31 ,  Y02D50/10

Abstract: For rate selection with margin sharing in a system with independent rate per stream, SNR estimates are obtained for multiple data streams. Rates are then selected for the data streams based on the SNR estimates and such that at least one data stream has negative SNR margin, each remaining data stream has a non-negative SNR margin, and the total SNR margin for all data streams is non-negative. For rate selection with margin sharing in a system with a vector-quantized rate set, SNR estimates are obtained for usable transmission channels. The total SNR margin is determined for each rate combination based on the SNR estimates for the transmission channels. Each rate combination is associated with a specific number of data streams to transmit, a specific rate for each data stream, and a specific overall throughput. The rate combination with the highest overall throughput and non-negative total SNR margin is selected for use.

Abstract translation: 对于具有每个流独立速率的系统中的边缘共享的速率选择，对于多个数据流获得SNR估计。 然后基于SNR估计对数据流选择速率，并且使得至少一个数据流具有负SNR余量，每个剩余数据流具有非负SNR余量，并且所有数据流的总SNR余量是非负的， 负。 对于具有向量量化速率集的系统中的边缘共享的速率选择，获得可用传输信道的SNR估计。 基于传输信道的SNR估计，为每个速率组合确定总SNR容限。 每个速率组合与要发送的特定数量的数据流，每个数据流的特定速率以及特定的总吞吐量相关联。 选择具有最高总吞吐量和非负总体SNR余量的速率组合使用。