公开(公告)号：US20130235825A1

公开(公告)日：2013-09-12

申请号：US13857025

申请日：2013-04-04

Applicant: QUALCOMM INCORPORATED

Inventor： J. Rodney WALTON ,  John W. KETCHUM ,  Mark S. WALLACE ,  Steven J. HOWARD

IPC: H04B7/04

CPC classification number: H04B7/0417 ,  H04B7/0421 ,  H04B7/043 ,  H04B7/0434 ,  H04B7/0452 ,  H04B7/0628 ,  H04B7/0669 ,  H04B7/0689 ,  H04B7/0697 ,  H04B7/0854 ,  H04B7/0871 ,  H04J11/003 ,  H04J11/0053 ,  H04L1/0001 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0017 ,  H04L1/06 ,  H04L5/0073 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/0242 ,  H04L25/0248 ,  H04L25/03343 ,  H04L25/03891 ,  H04L27/2601 ,  H04L27/2602 ,  H04L27/261 ,  H04L27/2647 ,  H04L27/2675 ,  H04W16/28 ,  H04W52/50 ,  H04W72/046 ,  H04W74/04

Abstract: A MIMO system supports multiple spatial multiplexing modes for improved performance and greater flexibility. These modes may include (1) a single-user steered mode that transmits multiple data streams on orthogonal spatial channels to a single receiver, (2) a single-user non-steered mode that transmits multiple data streams from multiple antennas to a single receiver without spatial processing at a transmitter, (3) a multi-user steered mode that transmits multiple data streams simultaneously to multiple receivers with spatial processing at a transmitter, and (4) a multi-user non-steered mode that transmits multiple data streams from multiple antennas (co-located or non co-located) without spatial processing at the transmitter(s) to receiver(s) having multiple antennas. For each set of user terminal(s) selected for data transmission on the downlink and/or uplink, a spatial multiplexing mode is selected for the user terminal set from among the multiple spatial multiplexing modes supported by the system.

Abstract translation: MIMO系统支持多种空间复用模式，以提高性能和更大的灵活性。 这些模式可以包括（1）在正交空间信道上将多个数据流发送到单个接收机的单用户导向模式，（2）单个用户非导向模式，其将多个数据流从多个天线发送到单个接收机 在发射机处没有空间处理，（3）多用户导向模式，其在发射机处通过空间处理同时向多个接收机发送多个数据流，以及（4）多用户非导向模式，其从 在具有多个天线的发射机到接收机处没有空间处理的多个天线（共同定位或非共同定位）。 对于在下行链路和/或上行链路上选择用于数据传输的每组用户终端，从系统支持的多个空间复用模式中，为用户终端机选择空间复用模式。

公开(公告)号：US20200067575A1

公开(公告)日：2020-02-27

申请号：US16666149

申请日：2019-10-28

Applicant: QUALCOMM Incorporated

Inventor： Jay Rodney WALTON ,  Lizhong ZHENG ,  John W. KETCHUM ,  Mark S. WALLACE ,  Steven J. HOWARD

IPC: H04B7/0417 ,  H04B7/06 ,  H04L1/06 ,  H04B17/336 ,  H04B7/0456

Abstract: Spatial spreading is performed in a multi-antenna system to randomize an “effective” channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain ND data symbol blocks to be transmitted in NM transmission spans, where ND≥1 and NM>1. The ND blocks are partitioned into NM data symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices, where L>1) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and transmitted via NT transmit antennas in one transmission span. The ND data symbol blocks are thus spatially processed with NM steering matrices and observe an ensemble of channels.

公开(公告)号：US20130182598A1

公开(公告)日：2013-07-18

申请号：US13788743

申请日：2013-03-07

Applicant: QUALCOMM Incorporated

Inventor： Irina MEDVEDEV ,  John W. KETCHUM ,  J. Rodney WALTON

IPC: H04W24/02

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: 在本公开中提出了在具有变化的SNR的多个空间信道的多通道通信系统中选择用于数据传输的合适传输模式的技术。 对于某些实施例，可以应用闭环技术，其中调整用于计算反馈到发射机的有效SNR值的回退因子。 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发送的分组被错误地接收来选择数据速率和数量的数据流。