Multiple-input-multiple-output OFDM (orthogonal frequency division multiplexing) shallow sea underwater acoustic communication pattern selection PAR (peak-to-average ratio) restraining method

Abstract

The invention provides a multiple-input-multiple-output OFDM shallow sea underwater acoustic communication pattern selection PAR restraining method. By the aid of the manner of multiplying scrambling patterns by sent data, the occurrence probability of an OFDM symbol peak is reduced; and pilot frequency carrying scrambling information of different distribution patterns is used and combined with the sparsity characteristic of a shallow sea underwater acoustic channel, the scrambling patterns are distinguished independently at a receiving end, the pattern selection PAR restrain for sideband-free information is realized, and the efficiency and the reliability of a communication system are effectively improved at the same time. According to an endless information transmission pattern selection PAR restraining algorithm, on the premise that the restrain performance of the PAPR (peak to average power ratio) is not lost, the distribution patterns are calculated accurately, and the reliable underwater acoustic communication for the endless information is realized.

Description

technical field [0001] The present invention relates to a peak-to-average power ratio suppression method for underwater acoustic communication, in particular to a peak-to-average power ratio suppression method based on MIMO-OFDM (input multiple output-orthogonal frequency division multiplexing) underwater acoustic communication . Background technique [0002] The available bandwidth resources in underwater acoustic communication are very limited, which seriously limits the quality and rate of underwater acoustic communication. In this context, the OFDM technology with high spectrum utilization combined with the MIMO technology that can substantially increase the channel capacity without increasing the available bandwidth or increasing the transmission power has become a high-speed water channel technology in recent years. The new hotspot of acoustic communication. The shallow ocean acoustic channel is usually regarded as a slowly time-varying sparse channel, which can be d...

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Problems solved by technology

[0004] Compared with the direct clipping method, although the PAPR suppression effect is slightly worse, this method has no bit error rate performance loss. The disadvantage is that multiple IFFT transformations are required, and the computational complexity is high.

In this way, a large amount of sideband information needs to be transmitted, resulting in a reduction in system communication efficiency and a waste of frequency bands.

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