Partial transmission sequence peak-to-average ratio suppression algorithm of boundless information suitable for spare underwater acoustic OFDM communication system

Abstract

The invention provides a partial transmission sequence peak-to-average ratio suppression algorithm of boundless information suitable for a spare underwater acoustic OFDM communication system, in particular relates to a method for solving the problem that the PTS algorithm needs to transmit side information through the adoption of the inherent sparsity of an underwater acoustic channel and the side information blind detector based on the matching pursuit channel reconstruction technology. The pectinate pilot frequencies distributed at different positions are used for carrying weighting factor selection information, and the matching pursuit technology is used for reconstructing the received different pilot frequency domain responses, and the high-reliability weighting factor blind detection can be realized through the combination with the inherent sparsity of the shallow sea underwater acoustic channel, the reliability of the communication system is guaranteed. Since the matching pursuit channel reconstruction technology adopted in the invention needs less pectinate pilot frequency number and is free from uniform; compared with the traditional PTS algorithm, the improved PTS peak-to-average ratio suppression algorithm has better PAPR suppression performance; and meanwhile, the communication frequency band utilization rate and the communication efficiency are further improved; the algorithm is suitable for the underwater acoustic communication system in resource shortage.

Description

technical field [0001] The invention relates to a partial transmission sequence peak-to-average ratio suppression algorithm suitable for boundless information of a sparse underwater acoustic OFDM communication system, which belongs to the underwater acoustic Orthogonal Frequency Division Multiplexing (OFDM) communication system. Background technique [0002] An important obstacle to the wide application of MIMO-OFDM in underwater acoustic communication is its high peak-to-average-power-ratio (PAPR) defect. The OFDM system is sensitive to the peak-to-average ratio, so that the dynamic range and nonlinear distortion of some components inside the system (such as power amplifiers, etc.) must meet very high requirements, which greatly increases the cost of equipment. Moreover, the transmission power of the underwater acoustic transducer is limited, and the peak-to-average ratio of the OFDM signal severely limits the effective utilization of the transmission power, reducing the tr...

AI Technical Summary

Problems solved by technology

[0006] The PAPR suppression effect of this method is good and there is no loss of bit error rate performance. 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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