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Method and apparatus for implementing space time processing with unequal modulation and coding schemes

A coding scheme, asymmetric technology, applied in the direction of adjusting channel coding, modulation carrier system, space transmit diversity, etc., can solve problems such as loss of diversity gain benefits

Active Publication Date: 2009-02-18
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this results in a loss of benefit in diversity gain for spatial streams carried by STBC precoding

Method used

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  • Method and apparatus for implementing space time processing with unequal modulation and coding schemes
  • Method and apparatus for implementing space time processing with unequal modulation and coding schemes
  • Method and apparatus for implementing space time processing with unequal modulation and coding schemes

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Embodiment

[0162] CLAIMS 1. A method for implementing spatial data processing using asymmetric MCSs in a wireless communication system comprising a transmitter and a receiver.

[0163] 2. The method according to embodiment 1, comprising the step of: generating a plurality of data streams from at least one input data.

[0164] 3. The method of embodiment 2, comprising the step of performing spatial processing on at least one data stream to generate a plurality of spatial streams, selecting the MCS independently for each data stream.

[0165] 4. The method of embodiment 3, comprising the step of transmitting the spatial streams via a plurality of transmit antennas.

[0166] 5. The method as in any one of embodiments 3-4, wherein the spatial processing is performed on only a portion of the data stream.

[0167] 6. The method as in any one of embodiments 3-5, wherein the MCS for data streams on which spatial processing is performed is different from the MCS for data streams on which spatial...

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Abstract

A method and an apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data / spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.

Description

technical field [0001] The present invention relates to wireless communication systems. More specifically, the present invention relates to a method and apparatus for implementing spatial processing using an unequal modulation and coding scheme (MCS). Background technique [0002] The IEEE 802.11n Joint Proposal Group is currently proposing a hybrid space-time block coding (STBC) and space-division multiplexing (SDM) scheme for next-generation high-performance wireless networks. This hybrid STBC / SDM scheme produces an unbalanced quality of service for the data stream, which translates into a lower residual signal-to-noise ratio (SNR) at the output of the receiver. In conventional systems, peer-to-peer MCS is applied to all spatial streams. However, this results in a loss of benefit in diversity gain for spatial streams carried by STBC precoding. [0003] Therefore, it is desirable to provide a method and apparatus for applying an asymmetric MCS or a stream-dependent MCS w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04B7/06
CPCH04L1/0606H04L1/0631H04L1/0009H04B7/0697H04L27/2626H04L1/0003H04B7/0619H04B7/0837H04B7/0669H04L27/2647H04L1/0625H04L1/0643H04B7/0671H04B7/0626H04B7/0891H04W84/12H04B17/336H04B7/0456
Inventor 罗伯特·L·奥勒森爱尔戴德·M·莱尔彼得·J·佛茨杨永文Q·Y·戴谷章修I·T·吕K·J·蔡
Owner INTERDIGITAL TECH CORP
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