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Method and device for sphere detection

A technology of modulation scheme and data symbol, which is applied in the direction of data rate detection device, transmission modification based on link quality, prevention/detection of errors through diversity reception, etc., and can solve problems such as large amount of calculation

Inactive Publication Date: 2013-11-06
QUALCOMM INC
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  • Abstract
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  • Claims
  • Application Information

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Such an exhaustive search is computationally expensive and prohibitive for many applications

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  • Method and device for sphere detection
  • Method and device for sphere detection
  • Method and device for sphere detection

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Embodiment Construction

[0020] The word "exemplary" is used herein to mean "serving as an example, instance and illustration". Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs.

[0021] The detection and rate selection techniques described herein can be used in various communication systems in which multiple data streams are transmitted in parallel over a communication channel. For example, these techniques can be used in MIMO systems using a single subcarrier, MIMO systems using multiple subcarriers, Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access (TDMA) systems, etc. . The multiple subcarriers may be obtained using Orthogonal Frequency Division Multiplexing (OFDM), Single Carrier Frequency Division Multiple Access (SC-FDMA), or some other modulation technique. OFDM and SC-FDMA divide the overall system bandwidth in...

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Abstract

Techniques for performing sphere detection to recover data symbols sent in a MIMO transmission are described. In an aspect, sphere detection is performed for data symbols generated with at least two modulation schemes. In another aspect, sphere detection is performed for the data symbols in an order determined based on at least one attribute of the data symbols, which may be error probabilities, modulation schemes, and / or link margins for the data symbols. In yet another aspect, rates for multiple data streams detected with sphere detection are selected based on channel state information. Signal qualities of the data streams may be estimated based on the channel state information, e.g., (1) an upper triangular matrix used for sphere detection and / or (2) an assumption that interference from data streams already detected is canceled. The rates for the data streams may be selected based on the estimated signal qualities.

Description

[0001] Claiming Priority Based on 35 U.S.C. §119 [0002] This patent application claims priority to Provisional Application No. 60 / 758,344, filed January 11, 2006, entitled "SPHEREDETECTION AND RATE SELECTION FOR A MIMO TRANSMISSION," assigned to the assignee herein and It is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates generally to communications and, more particularly, to techniques for performing detection and rate selection for MIMO transmissions. Background technique [0004] A MIMO transmission is a transmission that is sent from multiple (T) transmit antennas to multiple (R) receive antennas. A MIMO channel formed by T transmit antennas and R receive antennas can be decomposed into M spatial channels, where M≤min{T,R}. The M spatial channels may be used to transmit data in a manner that achieves higher overall throughput and / or higher reliability. [0005] A transmitter may encode and transmit the M data ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L1/06H04B7/08H03M13/00
CPCH04L25/03292H04L25/03242H04L1/0631H04L1/06H04B7/0413H04L25/0202H04L25/0262H04L1/0002
Inventor J·R·沃尔顿M·S.·华莱士S·J.·霍华德
Owner QUALCOMM INC