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Code multiplexing differential chaotic keying modem based on OFDM

A differential chaotic keying and modem technology, applied in multi-frequency code systems, modulated carrier systems, digital transmission systems, etc., can solve problems such as poor performance and low complexity, reduce system costs, and eliminate delay circuits Effect

Active Publication Date: 2019-09-27
XIAMEN UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of poor performance of the existing differential chaotic shift keying modem under the broadband time-varying channel, and to provide a dual-selective fading-resistant and low-complexity based OFDM Code multiplexing differential chaotic keying modem using (OFDM: Orthogonal Frequency Division Multiplexing) technology

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  • Code multiplexing differential chaotic keying modem based on OFDM
  • Code multiplexing differential chaotic keying modem based on OFDM
  • Code multiplexing differential chaotic keying modem based on OFDM

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Embodiment Construction

[0031] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0032] image 3 Shown is the composition structure of the code multiplexing differential chaotic keying modulator based on OFDM technology, and each frame transmission bit stream transmitted by the system is denoted as S i =b i,1 ,b i,2 ,...,b i,M , each bit of information will be assigned to the 3rd branch to the M+2th branch respectively as the information of the information bearing signal. The chaotic signal generator generates a chaotic signal of length T, which passes through the delay unit D of the second branch 1 ,D 2 ,...,D N-1 , the generation time is NT c chaotic carrier signal. The code multiplexing differential chaotic keying modulation technology based on the orthogonal frequency division multiplexing technology proposed by the present invention is a digital modulation and demodulation technology. Let the signal sampling frequenc...

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Abstract

The invention relates to a code multiplexing DCSK (Differential Chaotic Shift Keying) modulator-demodulator based on a PFDM (Orthogonal Frequency Division Multiplexing) technology, and relates to DCSK modulation and demodulation. By utilizing orthogonality of a Walsh code, orthogonality of a reference signal and an information carrying signal on a code domain and overlapping of the reference signal and the information carrying signal on a time domain are implemented, and the problems of different channel responses and poor transmission performance of the reference signal and the information carrying signal, which are caused by channel time selection, are solved; and by utilizing the OFDM technology, each code chip of one frame of signal is propagated on different sub carriers, so that the problem of intersymbol interference caused by channel frequency selection is avoided. Simulation under an Additive White Gaussian Noise (AWGN) channel and a multi-path time-varying channel shows that compared to conventional DCSK, the code multiplexing DCSK system based on the PFDM technology has good transmission performance under the AWGN channel and the multi-path time-varying channel and has resistance to time selection and resistance to frequency selection fading.

Description

technical field [0001] The invention relates to differential chaotic shift keying modulation and demodulation, in particular to a code multiplexing differential chaotic keying modem based on orthogonal frequency division multiplexing technology. Background technique [0002] Chaotic communication is a notification technology that uses chaotic signals as the carrier. The wide spectrum of chaotic signals and its noise-like and unpredictable characteristics make chaotic communication have the advantages of traditional spread spectrum communication technologies, such as anti-multi-user interference and low interception. It has good application prospects in short-distance wireless communication networks, such as WPAN: Wireless Personal Area Network, WLAN: Wireless Local Area Network, etc. [0003] Differential Chaotic Shift Keying (DCSK: Differential Chaotic Shift Keying) is a digital modulation and demodulation technology using chaotic signals as the carrier. The principle is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26
Inventor 徐位凯陈梦蕾王琳
Owner XIAMEN UNIV
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