Underwater acoustic communication adaptive modulation algorithm based on steady-state mean square error

Abstract

The invention relates to the technical field of underwater acoustic communication, in particular to an underwater acoustic communication adaptive modulation algorithm based on a steady-state mean square error which is particularly suitable for the actual underwater acoustic communication system and can effectively improve the transmission stability of the communication system. The underwater acoustic communication adaptive modulation algorithm based on the steady-state mean square error is characterized in that a transmitting end firstly transmits signals to build connection with a receiving end, received signals are processed, and the mean square error SMSE is acquired and converted to an SNR; and the SNR is then fed back to the transmitting end for adaptive selection on a modulation mode. In comparison with the prior art, the state information of an underwater acoustic channel does not need to be assumed to be known, the blind equalization-based output SMSE realizes adaptive adjustment of the modulation mode, the index takes into account the influence of different underwater acoustic channels on the detection performance, and the tap length of a blind equalizer can be adaptivelyadjusted according to the specific underwater acoustic channel.

Description

Technical field: [0001] The present invention relates to the technical field of underwater acoustic communication, in particular to an underwater acoustic communication system based on steady-state mean square error, which is especially suitable for actual underwater acoustic communication systems, can effectively improve the transmission reliability of the communication system, and does not need to assume that the channel state information is known. Adaptive modulation algorithm for acoustic communication. Background technique: [0002] Spatiotemporally varying multipath and limited bandwidth impose significant constraints on the achievable throughput of communication systems. Non-adaptive link transmission In order to ensure that the system is in acceptable performance, the system is generally only designed for the worst channel conditions, which leads to the underutilization of channel capacity. Especially for the underwater acoustic environment, the underwater acoustic ...

AI Technical Summary

Problems solved by technology

In fact, due to the complexity and variability of the underwater acoustic channel, the channel state information is difficult to estimate and obtain, which makes it difficult to estimate the signal-to-noise ratio. Therefore, the traditional adaptive modulation scheme based on the signal-to-noise ratio is not suitable for the actual underwater acoustic communication system.

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