Signal precoding method

Abstract

The invention relates to a signal precode method, wherein it comprises that: delaying the signal of each emission antenna; weighting phase of each delayed signal; when the precoded signal reaches receiver, checking the original signal, eliminating the weighted phase and delayed time, as changing the channel matrix; in following check, there will not be singular inverse matrix, to improve the signal checking property.

Description

technical field [0001] The invention relates to the signal transmission technology of the mobile communication system, in particular to a signal precoding method. Background technique [0002] In the mobile communication system, the sending end sends various signals. After the signal reaches the receiving end through the wireless channel, some changes may occur. The receiving end uses a certain algorithm to restore the received signal to the sending signal process, which is called Signal Detection. [0003] Suppose the signal received by the receiver is Y=Hd+n (1) [0004] Among them, A is the channel matrix, indicating the channel characteristics of the transmitted signal during transmission, d is the transmitted signal, indicating the actual information of the transmitting end, and n is the channel noise. When the receiving end performs signal detection, the usual method is: first obtain the weighting factor W, and then estimate the transmitted signal according to Y=Wd. ...

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Problems solved by technology

[0019] For the convenience of illustration, here it is assumed that h 11 , h 12 , h 21 , h 22 They are all 1. If there is no special explanation below, this assumption is established. It is obvious that H H H, is a singular matrix, if it cannot be solved, the weighting factor cannot be obtained, and then the transmitted signal d cannot be estimated correctly, which will seriously reduce the performance of the system

In a MIMO system, when the channel is a Gaussian channel or the correlation between the branches of the channel is strong, the matrix H H H is more likely to be singular, and in severe cases, it will cause the MIMO system to fail to detect signals normally

[0020] In fact, for other signal detection algorithms, the inversion process of a certain matrix may also be involved in the process of signal detection. If the matrix is ​​singular, the problem of signal detection performance degradation will occur.

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