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Multipath multivariate differential chaos shift keying iterative receiving method

A technology of shift keying and receiving method, applied in the field of demodulation in wireless communication technology, can solve the problem of low data transmission rate and so on

Active Publication Date: 2020-11-27
XIAMEN UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to provide a multi-channel multiple differential chaotic shift keying iteration that can improve the data transmission rate in view of the low data transmission rate of the existing differential chaotic shift keying iterative receiving system (binary modulation) Reception method (MP-MDCSK-IR)

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Embodiment Construction

[0049] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0050] figure 1 It shows the frame structure diagram of the signal transmitted by the MP-MDCSK-IR system at the transmitting end, figure 2 with image 3 The block diagrams of the transmitting end and the receiving end of the MP-MDCSK-IR system are shown respectively;

[0051] Its specific working process is as follows:

[0052] At the transmitting end, reference signals and information signals are transmitted through N channels. Firstly, N signal vectors are generated, and the length of each signal is β, and β is the spreading factor. The first channel transmits the chaotic reference signal, and the second channel to the N-1th channel transmit information-bearing signals. The chaotic signal generator generates a reference signal with a lengt...

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Abstract

The invention discloses a multipath multivariate differential chaos shift keying iterative receiving method, and belongs to the technical field of demodulation in a wireless communication technology.The method comprises the steps of: transmitting a reference signal and a information bearing signal through a plurality of parallel paths, performing correlation operation on the received reference signal and the information bearing signal at a receiving end to obtain a correlation value and a likelihood value; and using the likelihood value as a weight to carry out weighted summation on each signal to obtain a new reference signal, so that the noise of the reference signal is reduced, feedback iteration is carried out by using the new reference signal, the BER performance of the system is improved, and finally, the effectiveness is verified by using computer simulation. Simulation under an AWGN channel and a Rayleigh fading channel shows that the multi-channel multivariate DCSK iterativereceiving method can provide the reliability of the system. By using the iterative receiver provided by the invention, the reference signal is iteratively updated at the receiving end without transmitting a copy of the reference signal, so that the noise is suppressed, the BER performance of the system is improved, and the transmission reliability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of demodulation in wireless communication technology, and relates to a multi-channel multivariate differential chaotic shift keying iterative receiving method. Background technique [0002] Chaotic signals have wide spectrum characteristics and excellent correlation characteristics, which make chaotic communication systems have good anti-multipath fading performance. In addition, due to the sensitivity to initial conditions, it is easy to generate a large number of non-repetitive chaotic carriers, and chaotic signals can be realized with simple circuits. [0003] The Differential Chaos Shift Keying (DCSK) scheme is improved on the basis of CSK and COOK. The transmitter uses a differential method to realize keying, and the receiver uses a differential coherent receiving method to receive. The DCSK system needs half a bit period to send the reference chaotic signal, and the other half bit period to send the i...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04L27/34H04L27/38
CPCH04L27/001H04L27/3483H04L27/3854
Inventor 徐位凯李艳茹洪少华王琳
Owner XIAMEN UNIV
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