Multi-carrier multi-element differential chaotic shift keying noise suppression system and method

Abstract

The invention discloses a multi-carrier multi-element differential chaos shift keying noise suppression system and method, and belongs to the field of noise suppression in a wireless communication technology. A system transmitting terminal comprises a chaotic signal generator, a serial / parallel converter, a bit / symbol converter, a multivariate DCSK modulator, a pulse shaping filter, a multiplier and an adder. And A receiving terminal comprises a matched filter, a sampling module, an averaging module, a noise suppression module and a multivariate DCSK modulator. A correlation coefficient of a received reference signal and an information bearing signal is used as a weight factor at a receiving terminal, the weight factor is used as feedback to update the previous reference signal and the information bearing signal and suppress noise in the transmission signal, and the effectiveness of the proposed method is verified by computer simulation. Under an additive white Gaussian noise channel and a multipath fading channel, the noise in a transmission signal is significantly reduced, and the bit error rate performance of the system is improved. And the system and method having a wide application prospect in future wireless communication application.

Description

technical field [0001] The invention belongs to the field of noise suppression in wireless communication technology, and in particular relates to a multi-carrier multiple differential chaos shift keying noise suppression system and method. Background technique [0002] The inherent broadband, aperiodic and noise-like characteristics of chaotic signals make them have broad application prospects in spread spectrum communication and secure communication. Therefore, chaotic communication with chaotic signal as the carrier has been extensively studied in the field of wireless communication. Scholars at home and abroad have proposed many chaotic communication systems. One of the important modulation schemes is Differential Chaos Shift Keying (DCSK). . The DCSK system can realize a simple receiver without channel state information (Channel State Information, CSI), so the system does not need channel estimation and chaos synchronization at the receiving end. However, the DCSK syst...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the existing multi-carrier multi-differential chaotic shift keying system is adversely affected by noise in wireless channels, etc., and provide a reference signal that can reduce the influence of channel noise in the system's reference signal and information bearing signal, thereby improving the system. A multi-carrier multivariate differential chaotic shift keying noise suppression system and method with excellent BER performance

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