Multipath fading signal diversity combining and receiving method based on multipath fading channel

Abstract

The invention belongs to technical field of communication with a multipath fading channel characteristic, and discloses a multipath fading signal diversity combining and receiving method based on a multipath fading channel. The method comprises: acquiring N diversity branch signals, subjecting each diversity branch signal to channel estimation to obtain the channel response of each diversity branch signal; performing main path alignment on the corresponding diversity branch signal according to the channel response of each diversity branch signal; determining the weighting factor of each diversity branch signal subjected to the main path alignment and performing weighted summation on the N diversity branch signals subjected to the main path alignment to obtain a combined multipath signal; and performing channel equalization on the combined multipath signal to obtain an equalized signal; and demodulating the equalized signal to obtain a baseband signal received through the multipath fading channel. The method may effectively reduce implementation complexity while ensuring good signal performance.

Description

technical field [0001] The invention belongs to the technical field of communication with multipath fading channel characteristics, in particular to a multipath fading signal diversity combination receiving method based on the multipath fading channel. Background technique [0002] In principle, diversity combining is a technology to combat small-scale fading in wireless channels, where small-scale fading is caused by multipath transmission and Doppler effect. In a multipath transmission environment, if the multipath components arriving at the receiver are scattered and the arrival time interval is smaller than the baseband sampling period of the receiver, the received signal at the receiving end is the vector sum of a large number of multipath components. Due to the movement or change of the receiver or the transmission environment, the frequency of the received signal changes, that is, Doppler frequency deviation. The superposition of a large number of signals with differ...

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Problems solved by technology

[0005] Aiming at the shortcomings of the above-mentioned prior art, the present invention provides a multipath fading signal diversity combination receiving method based on a multipath fading channel, which can solve the problem that the complexity of the existing post-equalization combination scheme will double with the increase of diversity branches boost, which eventually leads to problems that are difficult to implement on existing hardware

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