Channel information feedback method of beam shaping system with Mt*2MIMO (Multiple Input Multiple Output) characteristic

Abstract

The invention relates to a channel information feedback method of a beam shaping system with a Mt*2MIMO (Multiple Input Multiple Output) characteristic, which only needs to feed back characteristic values lambda 1and lambda2 and a characteristic vector v1. The method particularly comprises the steps of: estimating a channel matrix H of a descending wireless channel by a user equipment terminal MS (Memory System); carrying out SVD (singular value decomposition) on the H by the user equipment terminal MS to obtain the lambda 1, the lambda 2 and the v1; quantizing and feeding back the lambda 1, the lambda2 and the v 1 by the user equipment terminal MS; solving a v 2 through v2=eigvec2[HHH] by using a formula HHH=lambda 1v1v1H+lambda2(E-v1v1H) by a base station BS on the basis of the feedback information quantity of the user equipment terminal MS; carrying out beam forming by adopting V=[v1H, v2H]H by the base station BS; and completing the channel information feedback method of the beam shaping system with the Mt*2MIMO characteristic. The invention ensures that the MIMO beam shaping system obtains greatest system capacity and space diversity gain and simultaneously reduces channel feedback information capacity, improves the transfer effectiveness of the MIMO beam shaping system, and enhances the practicability of the MIMO beam shaping system.

Description

technical field [0001] The invention relates to the field of wireless metropolitan area network access, in particular to a M t Channel information feedback method for ×2MIMO eigenbeamforming system. Background technique [0002] MIMO technology will become the mainstream technology in 4G communication. In order to fully obtain the diversity gain of MIMO system, various space-time processing technologies have been researched in recent years. Among them, MIMO beamforming technology can obtain the largest system capacity and various diversity. gained attention. A system that uses MIMO beamforming technology is a MIMO beamforming system. The MIMO beamforming system assumes that both the transmitting end and the receiving end know complete channel state information, and uses the transmitting end beamforming (Transmit Beamforming) and the receiving end maximum ratio combining technology (Receiver Combining) to increase the system capacity and obtain space diversity gain, thereby...

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Problems solved by technology

[0007] It can be seen from Equation (1) that the power allocation at the transmitter and the eigenbeamforming both need to know the channel matrix Λ and V, which are usually obtained from the feedback channel matrix at the receiver in the system. Therefore, especially when M t When the channel feedback is relatively large, the amount of channel feedback will be relatively large, and too much channel information feedback will occupy limited transmission resources, thereby reducing the effectiveness of the MIMO system, and may even offset the gain brought by the beamforming technology itself, so it is necessary to reduce Feedback amount of channel information

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