Method and device for pre-coding and decoding in distributed multi-antenna system

Abstract

The embodiment of the invention discloses a method and a device for pre-coding and decoding in a distributed multi-antenna system and relates to the technical field of wireless communication. By adopting the method and the device, the capacity of a multi-user interference system can be effectively improved, and the mutual interference among users can be reduced. The method for pre-coding in the distributed multi-antenna system comprises the following steps: getting an initial pre-coding matrix at the transmitting end; determining a receiving filter at the receiving end, wherein the receiving filter is orthogonal to an initial equivalent channel matrix of a channel which completely contains interference, and the initial equivalent channel matrix is got by utilizing the initial pre-coding matrix to calculate; performing multi-user pre-coding on an equivalent channel constituted by the receiving filter and the initial equivalent channel matrix, removing the interference in the initial equivalent channel matrix, and getting a pre-coding matrix at the transmitting end; and further performing the multi-user pre-coding through the pre-coding matrix. The method and the device can be widely applied in the technologies, such as LTE (long term evolution), LTE-Advanced, CoMP (coordinated multi-point) and the like.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for precoding and decoding in a distributed multi-antenna system. Background technique [0002] In a wireless communication system, the signals of different users interfere with each other. In a Gaussian interference channel, each user knows their own complete channel information, but data cannot be shared between users, and joint transmission cannot be performed. like figure 1 As shown, it shows the Gaussian interference channel of two users, at user x 1 and x 2 There is interference between them. While eliminating the interference between users, how to increase the capacity of the Gaussian interference channel has always been one of the main bottlenecks restricting the development of technology. [0003] A traditional solution to avoid mutual interference between users in an interference channel is to use orthogonalization, such as...

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Problems solved by technology

[0009] In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art: traditional orthogonalization solutions such as TDMA and FDMA lead to too low capacity of the system, which is only 1 / Klog(SNR)+o( log(SNR)), which limits the throughput of the system

However, the existing interference alignment methods are either suitable for a certain special channel, which is difficult to construct and almost impossible to implement, or have a high bit error rate and poor performance.

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