Limited feedback precoding method based on short wave multi-antenna system

Abstract

The invention relates to a limited feedback precoding method based on a short wave multi-antenna system. The limited feedback precoding method specifically comprises the following steps that (1) a codebook is designed; (2) a rotating Grassmann codebook under a short wave multi-antenna system channel is obtained, (3) a sending end inputs a code stream, modulates the code stream, and multiplies the modulated code stream by a precoding vector w to generate a sending signal vector; (4) a receiving end conducts channel estimation to obtain an instant channel matrix H; (5) according to the rotating Grassmann codebook obtained in the step (2), the optimum codon w is selected, a serial number corresponding to the w is returned to the sending end through a feedback channel, and the sending end updates the precoding vector w according to the serial number; (6) the receiving end adopts the maximum likelihood method for conducting signal detection and generates an output code stream after demodulation. Compared with the prior art, the correlation of the short wave channel is considered, the bit error rate of short wave multi-antenna system communication is lowered, and the signal transmission reliability is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a limited feedback precoding method based on a short-wave multi-antenna system. Background technique [0002] Short-wave communication is a radio communication method with a frequency of 3-30MHz. It has the advantages of flexible use, long communication distance, and unbreakable channels. However, the performance of short-wave communication has always been limited by narrow-band and time-varying channel characteristics, resulting in low data transmission rates. , poor communication reliability. On the premise of not increasing the system channel bandwidth and total transmission power, on the one hand, the multi-antenna technology can greatly improve the channel capacity through spatial multiplexing, and on the other hand, it can use space diversity to improve the bit error rate performance of the system, which is expected to be used in short-wave communication to ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a limited feedback precoding method based on the short-wave multi-antenna system in order to overcome the above-mentioned defects in the prior art, which effectively solves the problem of signal correlation in the short-wave channel, and provides a reference for deploying short-wave multi-antenna systems significance

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