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Limited feedback method, channel parameter forming method and wireless receiver in multi-antenna system

一种多天线系统、信道参数的技术，应用在有限反馈领域，能够解决过多资源、占用等问题，达到运算量低、实现有限反馈传输、克服信道畸变的效果

Inactive Publication Date: 2008-03-26
PANASONIC CORP
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Problems solved by technology

[0028] In order to overcome the problem that channel feedback information in a closed-loop multi-antenna CDMA system occupies too many resources, the present invention provides a multi-resolution limited feedback method, a channel parameter generation method and a wireless receiving device

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  • Limited feedback method, channel parameter forming method and wireless receiver in multi-antenna system

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Embodiment Construction

[0045] The implementation of the present invention comprises three major steps. As shown in Fig. 3, firstly, in the first step, the channel is estimated (step S101). Then in the second step, use the estimated channel to determine which model to use for limited feedback processing (step S102). Then in the third step, according to the result of model selection, limited feedback processing is performed according to the spatial domain model or the time domain model (step S103 or S104).

[0046] Assuming 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 transmitting antenna k can be obtained k (t). The wireless channel can be regarded as a superposition of P multipaths, assuming that the direction of arrival of the pth multipath is υ k、p , with a delay of τ k、p , its complex decay is α k、p (t), the discrete space-time channel H k (t) c...

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Abstract

A channel parameter generating method realizing limited feedback of a MIMO system. In this method, a channel parameter of a MIMO channel fed from a wireless receiver back to a wireless transmitter is generated. Channel estimation is carried out by using a signal received through a MIMO channel, the ranks of the space domain correlation matrix and the time domain correlation matrix of the MIMO channel are derived from the channel matrix obtained by the channel estimation, an operation to decrease the number of dimensions of the column of the estimated channel matrix is carried out if the rank of the derived space domain correlation matrix is smaller than that of the derived time domain correlation matrix, thereby a channel parameter is obtained, an operation to decrease the number of dimensions of the row of the estimated channel matrix is carried out if the rank of the derived time domain correlation matrix is smaller than that of the derived space domain correlation matrix, and a channel parameter is obtained.

Description

technical field [0001] The present invention relates to a limited feedback (limited feedback) technology in a multi-antenna code division multiple access (CDMA) wireless communication system, in particular to a limited feedback method, a channel parameter generation method and a wireless receiving device in a multi-antenna system, which are applicable It is suitable for high-speed wireless communication systems and high-throughput wireless local area network systems in various cellular modes, and is especially suitable for various communication systems using 3GPP TXAA mode. Background technique [0002] A Multiple-Input Multiple-Output (MIMO) system uses multiple antennas at the transmitting end and the receiving end, which can effectively increase the transmission rate, resist various selective fading, and support communication under the condition of multiple users. A large number of research results have shown (for example, refer to Non-Patent Document 1) that the MIMO sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04J15/00H04B1/707H04B1/7113H04J13/00H04J99/00
CPCH04L25/0204H04B7/0626H04L25/0224H04B7/0663H04L25/0242H04L25/0248H04L25/0212
Inventor 赵铮李继峰
Owner PANASONIC CORP
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