Multi-user underwater acoustic communication method based on single-vector hydrophone

Abstract

The invention discloses a multi-user underwater acoustic communication method based on a single-vector hydrophone. An original information sequence of a transmitting end is sent out through carrier modulation after being subjected to differential encoding and direct sequence spread spectrum codes respectively; a receiving end vector hydrophone outputs signals, vector combination processing is firstly carried out on the signals, then time reversal processing is carried out on the signals obtained after vector combination, the signals obtained after time reversal processing are sent to a spreadspectrum receiver to complete decoding processing of a current user, and finally zero setting interference offset processing is utilized for removing decoded users. The method has the beneficial effects that each user is decoded in sequence according to the power, so that the influence of multi-access interference when the user is expected to decode can be effectively inhibited. And after the expected user finishes decoding, the high-power user is eliminated by utilizing zero-setting interference cancellation processing, so that the subsequent user decoding is not interfered by the high-poweruser, the problem of underwater near-far effect can be effectively solved, and the performance of the underwater multi-user communication system is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to a multi-user underwater acoustic communication method based on a single-vector hydrophone. Background technique [0002] As the pace of human development of the ocean continues to accelerate, the demand for underwater information transmission will continue to increase. Underwater acoustic communication is currently the most effective means of underwater long-distance information transmission. It not only has a strong application background in the military field, but is also indispensable in the civilian field. The underwater acoustic channel is a time-, frequency-, and space-variable channel with limited bandwidth. The complexity and variability of the underwater acoustic channel make high-quality underwater acoustic communication face severe challenges. [0003] Today's underwater acoustic communication development prospect is an underwater...

AI Technical Summary

Problems solved by technology

The problem of "underwater far-near effect" refers to the large difference in power when the signals of different users arrive at the main node due to the spatial differences between different users and the main node (including horizontal distance, vertical depth, difference in seabed bottom quality, etc.), making large The power will cause strong interference to the decoding of low-power users, which will lead to the failure of decoding of low-power users

Power control is an effective method to solve the "near-far effect" problem, but due to the complexity of the underwater physical environment, underwater multi-user power control is difficult to achieve in practical applications

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