Diversity receiving method in spread spectrum communication system based on linear frequency regulation series

Abstract

The invention in use for wireless communication includes following steps: obtaining estimated value of channel from data signals of received baseband signals in training sequence signals of spread spectrum communication system; picking up a sample signal in spread spectrum sequence cycle from the said data signal; carrying out conjugate transformation for initial spread spectrum sequence; multiplying the transformed spread spectrum sequence by the said sampled signal, and then carrying out FFT; multiplying obtained Kth value by phase exp(- jk2Pi / N) so as to obtain sliding correlation value between received signal and initial spread spectrum sequence; based on estimated value of channel, carrying out multidiameter combination for sliding correlation value. The transmission data are obtained from spread spectrum sequence corresponding to maximum among combined values. Advantages are: reducing amount of calculation in channel estimation and Rake reception, increasing flexibility.

Description

technical field [0001] The invention relates to a diversity receiving method in a spread spectrum communication system based on a chirp sequence, in particular to a channel estimation and a Rake receiving method in the diversity receiving, and belongs to the technical field of wireless communication. Background technique [0002] Signals in wireless communication systems often experience the influence of multipath channels, resulting in mutual interference between signals at adjacent times. According to the difference of signal bandwidth and system working environment, the impact caused by multipath interference is also different. In some cases, although multipath interference exists, its influence is very small, and it is not necessary to take special measures to counteract its influence. In some cases, the receiver is required to suppress the influence of multipath interference by means of equalization or diversity reception. For communication systems based on spread spe...

AI Technical Summary

Problems solved by technology

Although the calculation amount of the sliding correlation algorithm has been greatly reduced compared with the least squares algorithm, in the communication system based on the chirp sequence for spreading, the nature of the chirp sequence can be used to further reduce the calculation amount of the channel estimation

In addition, in the prior art, channel estimation must be performed after the frequency offset is fully compensated

[0004] For communication systems that use multiple spread spectrum sequences for data modulation, Rake reception needs to process every possible transmission sequence once during demodulation, resulting in a large computational burden

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