Receiver structures for spatial spreading with space-time or space-frequency transmit diversity

A transmit diversity, space-time technology, applied in the field of communication, can solve the problem of different channel response

Active Publication Date: 2007-10-10
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, the channel responses of NT · NR propagation paths may be different from each other

Method used

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  • Receiver structures for spatial spreading with space-time or space-frequency transmit diversity
  • Receiver structures for spatial spreading with space-time or space-frequency transmit diversity
  • Receiver structures for spatial spreading with space-time or space-frequency transmit diversity

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Embodiment Construction

[0019] As used herein, the term "exemplary" is used to mean "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" should not be construed as preferred or advantageous over other embodiments.

[0020] The data transmission and reception techniques described herein may be used for multiple-input single-output (MISO) as well as multiple-input multiple-output (MIMO) transmissions. MISO transmission uses multiple transmit antennas and a single receive antenna. MIMO transmission uses multiple transmit antennas and multiple receive antennas. These techniques can also be used in single-carrier and multi-carrier communication systems. Multiple carriers may be obtained using Orthogonal Frequency Division Multiplexing (OFDM), other multi-carrier modulation techniques, or other concepts. OFDM effectively divides the total system bandwidth into multiple (N F a) orthogonal frequency subbands, which are also called tones, subcarriers, bins, an...

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Abstract

A receiving entity (150) 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, 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 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.

Description

[0001] Priority claim based on 35 U.S.C. §119 [0002] This patent application claims priority to Provisional Application No. 60 / 607,371, filed September 3, 2004, entitled "Steering Diversity with Space-Time Transmit Diversity for a Wireless Communication System"; and Priority to Provisional Application No. 60 / 608,226, entitled "Steering Diversity with Space-Time and Space-Frequency Transmit Diversity Schemes for a Wireless Communication System," each assigned to the assignee of the present application, is hereby incorporated by reference It is incorporated into this application. technical field [0003] The present invention relates generally to communications, and more particularly to techniques for processing data in multi-antenna communications systems. Background technique [0004] A multi-antenna communication system uses multiple (N T ) transmit antennas and one or more (N R ) receiving antenna for data transmission. N can be T Each transmit antenna is used to in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04L1/06
Inventor 马克・S.・华莱士伊琳娜・梅德韦杰夫杰伊・罗德尼・沃尔顿
Owner QUALCOMM INC
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