DL-CNN (deep leaning-convolutional neutral network) demodulator for super-Nyquist rate communication

Abstract

The invention discloses a DL-CNN (deep learning-convolutional neutral network) demodulator for super-Nyquist rate communication. For digitally modulated signals via a strict band-limited channel and even more than Nyquist rate bandwidth limitation, the demodulator directly extracts signal features including intersymbol interference from received signal samples subjected to filtering by a shock filter or an ordinary bandpass filter at the receiving end by the aid of a CNN, the CNN is trained by the aid of DL, and associated decision is made by adopting a single symbol element or multiple symbols, so that the signal samples can be classified by the DL-CNN under the higher intersymbol interference environment, intersymbol interference demodulation of the super-Nyquist rate modulation signals is realized, and good modulation performance and higher adaption capability are achieved as compared with a conventional amplitude integral judgment modulator.

Description

technical field [0001] The invention relates to the field of communication, in particular to the problem of decision demodulation of inter-symbol interference modulation signals when the communication symbol rate exceeds the Nyquist rate. Background technique [0002] With the continuous development of information technology, broadband mobile communication and smart phones, not only the radio spectrum has become a scarce resource, but also the communication base stations all over the country consume more than tens of billions of kWh every year. Therefore, the modern information society urgently needs to have high spectrum utilization. An information transmission system with high efficiency and high energy utilization. [0003] 1. Super Nyquist rate [0004] In the field of digital communication, the baud rate is the modulation rate, which refers to the rate at which the effective data signal modulates the carrier, which can be understood as the number of symbols (also calle...

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Problems solved by technology

[0021] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a high-performance demodulator capable of directly demodulating super-Nyquist rate modulation signals, which is used to overcome the existing communication system spectrum utilization and energy Technical Issues with Low Utilization

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