Single-carrier frequency domain equalization underwater acoustic communication system residual phase offset correction method based on phase search

Abstract

The invention provides a single-carrier frequency domain equalization underwater acoustic communication system residual phase offset correction method based on phase search, and the method comprises the following steps that: a transmitting end adds a pseudo-random sequence in front of and behind each single-carrier data block; a receiving end respectively constructs multi-angle phase rotation sequence sets of front and back pseudo-random sequences; correlation operation is carried out on sequences in the two sets one by one through a local pseudo-random sequence to obtain front and back pseudo-random sequence phase rotation angles with minimum correlation coefficients, linear interpolation is performed by taking the front and back pseudo-random sequence phase rotation angles as heads and tails to obtain phase offset estimation of each chip in the data block, and residual phase correction is performed on the data block by utilizing the phase offset estimation. The method has the advantages that the problem that in a single-carrier frequency domain equalization underwater acoustic communication system, due to decoding result phase rotation caused by signal synchronization errors andchannel estimation errors, the bit error rate is increased is effectively solved.

Description

technical field [0001] The invention relates to underwater acoustic communication technology, more precisely, it is a single carrier frequency domain equalization underwater acoustic communication system residual phase deviation correction method based on phase search. Background technique [0002] With the development of marine science and marine development, high-speed underwater acoustic communication technology has gradually 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-average ratio, thereby reducing the linear dynamics of the power amplifier. Therefore, it is suitable for high-speed information transmission between small underwater platforms with limited power and othe...

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

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