Underwater acoustic communication transmission method based on Farrow filtering and codeword matching

Abstract

The invention relates to an underwater acoustic communication transmission method based on Farrow filtering and codeword matching. The method comprises the steps: 1) setting a simulation underwater acoustic FTN channel, and setting an irregular code matched with the channel; 2) realizing the FTN quick forming by a transmitting end based on a Farrow filter; 3) realizing the Doppler compensation andFTN quick sampling by a receiving end based on Farrow filtering; and 4) realizing the direct adaptive turbo equalization by the receiving end based on the irregular code, wherein for the received symbol sequence obtained in the step 3), inter-symbol interference caused by time-varying underwater acoustic channel and FTN pulse forming is eliminated based on direct adaptive turbo equalization, anda decoder adopted by a receiving end is the decoder of the irregular code matched with the channel in the step 1). Through the method and the device, a self-adaptive filter parameter setting mechanismcan be established, the method and the device are suitable for FTN transmission at any symbol rate. Meanwhile, a channel coding mode is matched with actual channel characteristics.

Description

technical field [0001] The invention belongs to the field of high-speed underwater acoustic communication, and in particular relates to an underwater acoustic communication transmission method based on Farrow filtering and codeword matching, and the method is applied to a super-Nyquist or FTN transmission system. Background technique [0002] Underwater acoustic communication is the only way to carry out multi-distance wireless communication underwater. However, due to the limitation of underwater acoustic bandwidth, it is necessary to adopt a transmission method with high spectrum utilization rate to increase the communication rate to meet the data transmission in the wireless expansion system of the future submarine observation network. And the need for real-time wireless video transmission of submersibles. [0003] On the one hand, in the FTN transmission method of underwater acoustic communication in the prior art, both the transmitting end and the receiving end need to ...

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Problems solved by technology

[0008] In view of this, the purpose of the present invention is to establish an underwater acoustic communication transmission mechanism, which can be applied to any symbol rate and matches the underwater acoustic channel, and solve the complex transmission and reception processing existing in the existing underwater acoustic communication FTN transmission system. High accuracy, high turbo equalization signal-to-noise ratio threshold and other technical problems, in order to solve the above technical problems, the present invention provides an underwater acoustic communication transmission method based on Farrow filtering and codeword matching, the method includes:

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