A residual phase offset correction method for single-carrier frequency-domain equalized underwater acoustic communication system based on phase search

Abstract

The present invention provides a method for correcting residual phase offset of a single-carrier frequency-domain equalized underwater acoustic communication system based on phase search. The method includes the following steps: at the transmitting end, a pseudo-random sequence is added before and after each single-carrier data block; At the receiving end, the multi-angle phase rotation sequence sets of the front and rear pseudo-random sequences are respectively constructed, and the local pseudo-random sequences are respectively correlated with the sequences in the two sets one by one to obtain the phase rotation angles of the front and rear pseudo-random sequences that minimize the correlation coefficient, respectively. The phase rotation angle of the post-pseudo-random sequence is the first and last, and linear interpolation is performed to obtain the phase offset estimation of each chip in the data block, and the residual phase correction of the data block is performed by using the phase offset estimation. The beneficial effects of the invention are as follows: the invention effectively solves the problem of increasing bit error rate due to the phase rotation of the decoding result caused by the signal synchronization error and the channel estimation error in the single-carrier frequency-domain equalized underwater acoustic communication system.

Description

technical field [0001] The present invention relates to underwater acoustic communication technology, more specifically, to a residual phase offset correction method of a single-carrier frequency domain equalized underwater acoustic communication system based on phase search. Background technique [0002] With the development of marine science and ocean development, high-speed underwater acoustic communication technology has increasingly become the focus of research. [0003] The current mainstream high-speed underwater acoustic communication technology mainly includes OFDM technology and single-carrier technology. Compared with OFDM underwater acoustic communication technology, the transmitted signal of single-carrier underwater acoustic communication technology has a lower peak-to-level ratio, thereby reducing the linear dynamic of the power amplifier. Therefore, it is suitable for high-speed information transmission between small underwater platforms with limited power to...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that due to the existence of signal synchronization error and channel estimation error, after the single carrier frequency domain equalization underwater acoustic communication receiving signal undergoes synchronization, Doppler compensation, and channel equalization, the phase rotation of the decoding result will occur, resulting in erroneous In order to solve the problem of code rate increase, a method for correcting residual phase deviation of single-carrier frequency domain equalization underwater acoustic communication system based on phase search is provided, which can effectively correct residual phase deviation and improve decoding performance

Images