Multi-carrier underwater high-speed communication system based on filter bank

Abstract

The invention discloses a multi-carrier underwater high-speed communication system (Filter Bank Multi-carrier (FBMC)) based on a filter bank. At a sending end, a sending signal is subjected to Turbo coding and 4QAM mapping, then is subjected to filtering forming through a pulse forming filter based on an extended Gaussian function (EGF), and finally is subjected to signal sending after being subjected to IFFT, serial-parallel conversion, up-sampling and other processing. At a receiving end, after being processed by a passive time reversal mirror (PTRM) technology, a received signal is subjected to down-sampling, parallel-serial conversion, FFT and pulse shaping filtering, and then is processed by a frequency domain decision feedback equalizer (F-DFE) to obtain a received signal; the effectiveness of the method provided by the invention is proved through simulation, and compared with a common multi-carrier system, the method provided by the invention can achieve a higher transmission speed under lower spectrum resources, and can also obtain high-quality transmission performance at a receiving end.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, and relates to a design of a communication system for signal transmission in a complex underwater acoustic environment. It involves EGF pulse shaping filter, passive time reversal (PTRM) and other methods. Background technique [0002] How to realize underwater high-speed communication has always been a priority problem in the field of underwater acoustic communication. With the continuous development of human beings, the importance of the ocean has become more and more prominent. Acoustic waves are currently the only and most effective form of energy that can travel long distances in the ocean. Therefore, underwater acoustics play an extremely important role in the national ocean development strategy, and high-speed underwater acoustic communication has attracted more and more attention. High-speed underwater acoustic communication has good development prospects in both military...

AI Technical Summary

Problems solved by technology

Acoustic waves will inevitably propagate along many different paths. The signal received by the receiving end presents the characteristics of frequency selective fading, time selective fading and non-stationary characteristics. Severe intersymbol interference makes underwater communication face huge challenges. There are also great difficulties in the realization of high-quality underwater acoustic high-speed communication

At present, underwater acoustic OFDM communication uses cyclic prefixes to deal with intersymbol interference very well, but at the cost of reducing transmission speed; therefore, research on underwater acoustic communication with both high speed and high quality is an inevitable development

Images