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Limited feedback method for multi-antenna system

A finite, scale coefficient technique, applied in the field of finite feedback, which can solve problems such as unbearable complexity and inability to achieve rank reduction

Inactive Publication Date: 2006-10-04
PANASONIC CORP
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Problems solved by technology

[0014] Some scholars have studied the rank reduction algorithm under MIMO system [9] , it is necessary to perform eigenvalue decomposition on the channel matrix. When the dimension of the channel matrix is ​​high or there are many users, the complexity of this eigenvalue decomposition is unbearable.
When the number of resolvable multiple warps is large, the algorithm cannot achieve the purpose of rank reduction

Method used

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Embodiment Construction

[0029] Implementation of the present invention includes 3 major parts, as figure 1 As shown, first estimate the channel (step S101); then use the estimated channel to determine which model should be used for limited feedback processing (step S102); the third step is to perform according to the space domain or time domain model according to the result of model selection Limited feedback processing (step S103 or S104).

[0030] Assume that the code division multiple access (CDMA) system has M receiving antennas and K transmitting antennas. After sampling according to the chip rate, the discrete space-time channel model H of the transmitting antenna k is obtained. k (t). The wireless channel can be regarded as a superposition of P multipaths, and the incoming wave direction of the pth multipath is υ k，p , with a delay of τ k，p , its complex decay is αk，p (t), discrete space-time channel H k (t) can be expressed as

[0031] H k ...

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Abstract

The invention discloses a limit feedback method in the multi-antenna system, which comprises the following steps: estimating the channel matrix from the received signal, computing the empty region autocorrelation matrix and the rank of the empty region autocorrelation matrix by the channel matrix, computing the time region autocorrelation matrix and the rank of the time region autocorrelation matrix by the channel matrix, if the rank of the empty region autocorrelation matrix is less than the rank of the time region autocorrelation matrix, it uses the column of the channel matrix to do wavelet converting to obtain the limit feedback output; if the rank of the empty region autocorrelation matrix is more than the rank of the time region autocorrelation matrix, it uses the line of the channel matrix to do wavelet converting to obtain the limit feedback output.

Description

technical field [0001] The present invention relates to the limited feedback technology in multi-antenna code division multiple access (CDMA) wireless communication system, specifically relates to a kind of limited feedback method of multi-antenna system, can be applicable to the high-speed wireless communication system and high throughput under various cellular systems The wireless local area network system is especially suitable for various communication systems using 3GPPTXAA mode. Background technique [0002] A Multiple-Input Multiple-Output (MIMO) system uses multiple antennas at the transmitting or receiving end, which can effectively increase the transmission rate, resist various selective fading, and support communication under multi-user conditions. A large number of research results have shown that [1] , MIMO system is the most potential technology for high-speed transmission in 3G and 4G cellular communication systems, fixed wireless access systems, and wireless...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04B1/707H04B1/7113H04J13/00H04J99/00
CPCH04B7/0626H04L25/0204H04L25/0248H04L25/0242H04B7/0663H04L25/0212H04L25/0224
Inventor 赵铮李继峰
Owner PANASONIC CORP
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