公开(公告)号：US09787375B2

公开(公告)日：2017-10-10

申请号：US14523450

申请日：2014-10-24

Applicant: QUALCOMM Incorporated

Inventor： Jay Rodney Walton ,  Lizhong Zheng ,  John W. Ketchum ,  Mark S. Wallace ,  Steven J. Howard

IPC: H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04B7/0417 ,  H04L1/06 ,  H04B17/336 ,  H04B7/0456

CPC classification number: H04B7/0417 ,  H04B7/0456 ,  H04B7/0669 ,  H04B17/336 ,  H04L1/06

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：US09154274B2

公开(公告)日：2015-10-06

申请号：US13920971

申请日：2013-06-18

Applicant: QUALCOMM Incorporated

Inventor： Jay Rod Walton ,  John W. Ketchum ,  Mark Wallace ,  Steven J. Howard

IPC: H04L5/00 ,  H04W72/04 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L25/02 ,  H04L27/26 ,  H04W28/20 ,  H04W52/50

CPC classification number: H04L5/0007 ,  H04B7/0421 ,  H04B7/043 ,  H04B7/0669 ,  H04B7/0697 ,  H04B7/0854 ,  H04L1/0017 ,  H04L5/0023 ,  H04L5/0028 ,  H04L5/0037 ,  H04L25/0232 ,  H04L25/0248 ,  H04L27/2602 ,  H04W28/20 ,  H04W52/50 ,  H04W72/04

Abstract: Techniques to use OFDM symbols of different sizes to achieve greater efficiency for OFDM systems. The system traffic may be arranged into different categories (e.g., control data, user data, and pilot data). For each category, one or more OFDM symbols of the proper sizes may be selected for use based on the expected payload size for the traffic in that category. For example, control data may be transmitted using OFDM symbols of a first size, user data may be transmitted using OFDM symbols of the first size and a second size, and pilot data may be transmitted using OFDM symbols of a third size or the first size. In one exemplary design, a small OFDM symbol is utilized for pilot and for transport channels used to send control data, and a large OFDM symbol and the small OFDM symbol are utilized for transport channels used to send user data.

Abstract translation: 使用不同大小的OFDM符号来实现OFDM系统更高效率的技术。 系统业务可以被布置成不同的类别（例如，控制数据，用户数据和导频数据）。 对于每个类别，可以基于该类别中的业务的预期有效载荷大小来选择适当尺寸的一个或多个OFDM符号用于使用。 例如，可以使用第一大小的OFDM符号发送控制数据，可以使用第一大小和第二大小的OFDM符号发送用户数据，并且可以使用第三大小或第一大小的OFDM符号来发送导频数据 。 在一个示例性设计中，小OFDM符号用于导频和用于发送控制数据的传输信道，并且将大OFDM符号和小OFDM符号用于用于发送用户数据的传输信道。

公开(公告)号：US09013974B2

公开(公告)日：2015-04-21

申请号：US14458933

申请日：2014-08-13

Applicant: QUALCOMM Incorporated

Inventor： Jay Rodney Walton ,  Mark S. Wallace ,  John W. Ketchum ,  Steven J. Howard

IPC: H04J3/00 ,  H04L5/00 ,  H04B7/02 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L1/06 ,  H04L1/18 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W72/12 ,  H04L1/08 ,  H04L1/16 ,  H04W28/20 ,  H04W28/22 ,  H04W52/42 ,  H04W52/50 ,  H04W84/12

CPC classification number: H04L5/0048 ,  H04B7/022 ,  H04B7/0421 ,  H04B7/043 ,  H04B7/0443 ,  H04B7/0669 ,  H04B7/0689 ,  H04B7/0697 ,  H04B7/0854 ,  H04B7/0871 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0017 ,  H04L1/0025 ,  H04L1/0059 ,  H04L1/0061 ,  H04L1/0069 ,  H04L1/0071 ,  H04L1/0606 ,  H04L1/0625 ,  H04L1/0656 ,  H04L1/08 ,  H04L1/16 ,  H04L1/1887 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/0248 ,  H04L25/03343 ,  H04L27/2602 ,  H04L27/2607 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04W28/20 ,  H04W28/22 ,  H04W52/42 ,  H04W52/50 ,  H04W72/12 ,  H04W84/12

Abstract: A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implements rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgment, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may then be simplified by taking advantage of the reciprocal nature of the downlink and uplink and the calibration.

Abstract translation: 采用MIMO，OFDM和TDD的多接入MIMO WLAN系统。 系统（1）使用具有多个可配置传输信道的信道结构，（2）支持基于信道条件和用户终端能力可配置的多种速率和传输模式，（3）采用具有多种类型 （4）实现速率，定时和功率控制环路，实现系统正常运行，（5）采用随机接入方式进行系统接入，由用户终端 ，快速确认和快速的资源分配。 可以执行校准以考虑接入点和用户终端处的发射/接收链的频率响应的差异。 然后可以通过利用下行链路和上行链路的相互性质和校准来简化空间处理。