Precoding and decoding method and device in distributed type multi-antenna system

Abstract

The embodiment of the invention discloses a precoding and decoding method and device in a distributed type multi-antenna system, and relates to the technical field of wireless communication. The capacity of a multi-user interference system can be effectively improved, and mutual interference of users is lowered. The precoding device comprises a function building unit, an expression obtaining unit, an iterative computation unit and a precoding unit. The function building unit builds a corresponding LaGrange function according to the mean square error of data vectors to be sent by a sending side and corresponding sending power constraints of the sending side. The expression obtaining unit obtains the expression of a precoding matrix and the expression of a receiving filter according to the optimization condition of the LaGrange function. The iterative computation unit carries out iterative computations to obtain the precoding matrix according to the expression of the precoding matrix, the expression of the receiving filter and the initial value of the precoding matrix. The precoding unit is used for carrying out multi-user precoding through the precoding matrix. The precoding and decoding method and device can be widely applied to LTE, LTE-Advanced CoMP technologies 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. Such as 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] The traditional solution to avoid mutual interference between users in an interference channel is to adopt orthogonalization, ...

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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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