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Multi-antenna transmission for spatial division multiple access

A multi-output, multi-input technology, applied in the field of data communication

Active Publication Date: 2011-07-13
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Some key challenges of SDMA in multiple-access MIMO systems are: (1) selecting an appropriate set of user terminals for simultaneous transmission; and (2) sending data to each selected user terminal in a manner that achieves good system performance and / or send data from each selected user terminal

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  • Multi-antenna transmission for spatial division multiple access

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Embodiment Construction

[0018] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

[0019] The multi-antenna transmission techniques described herein can be used in conjunction with various wireless technologies such as CDMA, OFDM, TDMA, and so on. Multiple user terminals can simultaneously transmit / receive data through different (1) orthogonal code channels for CDMA, (2) time slots for TDMA, or (3) subbands for OFDM. A CDMA system may employ IS-2000, IS-95, IS-856, Wideband-CDMA (W-CDMA), or some other standard. An OFDM system may employ IEEE 802.11 or some other standard. A TDMA system may employ GSM or some other standard. These various standards are known in the art. As described below, spatial processing for multi-antenna transmission may be performed (either before or after) in addition to data processing for the ...

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Abstract

The invention relates to a multi-antenna transmission for spatial division multiple access. An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An ''effective'' uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.

Description

[0001] This application is a divisional application of a Chinese patent application with the application number 200480040710.1, the application date is November 12, 2004, and the invention title is "multi-antenna transmission for space division multiple access". technical field [0002] The present invention relates generally to data communications, and more particularly to multiple antenna transmissions for Space Division Multiple Access (SDMA) in Multiple Input Multiple Output (MIMO) communication systems. Background technique [0003] For data transmission, MIMO systems employ multiple (N T ) transmit antenna and multiple (N R )Receive antenna. N T transmit antennas and N R A MIMO channel composed of receiving antennas is decomposed into N S spatial channels, where N S ≤min{N T , N R}. N can be used S N S independent streams for greater overall throughput. [0004] In a multiple-access MIMO system, an access point can communicate with one or more user terminals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/02H04B7/08H04B7/06H04B1/7103H04J11/00H04J99/00H04Q7/36
CPCH04B7/0421H04B7/0408H04L5/023H04B7/043H04B7/0619H04B7/0617H04B1/71072H04B7/0413H04B7/0678H04B17/309H04B7/0697H04W16/28
Inventor J·罗德尼·沃尔顿约翰·W·凯彻姆约翰·爱德华·斯米马克·S·华莱士史蒂文·J·霍华德
Owner QUALCOMM INC
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