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Reference diversity design algorithm of multistage code shift differential chaotic shift keying system

A technology of shift keying and design algorithm, applied in the field of modulation, can solve problems such as poor performance, achieve excellent performance, optimal performance, and reduce interference

Inactive Publication Date: 2019-11-05
XIAMEN UNIV
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Problems solved by technology

[0014] The purpose of the present invention is to provide a multi-level code-shift differential chaotic shift keying system that can reduce system noise and improve system performance in view of the poor performance of the existing multi-level code-shift differential chaotic shift keying system in wireless channels. Design Algorithm of Reference Diversity (MCS-DCSK-RD) for Shift Keying System

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[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0037] Such as figure 1 As shown, the specific working process of the embodiment of the present invention is as follows:

[0038] At the transmitter, suppose the Walsh code sequence used to modulate the mth reference signal is (m=1,2,...,M), the Walsh code sequence used to modulate the nth information bit is (n=1,2,...,N), where P is the length of the walsh code sequence. Therefore, the total transmission signal is the sum of the reference signal and the information-bearing signal. Assuming that only the first transmission symbol is considered, the discrete form of the transmission signal e of the MCS-DCSK-RD system is k It can be expressed as:

[0039]

[0040] Among them, sending symbol a n ∈{-1,+1} by the i...

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Abstract

The invention discloses a reference diversity design algorithm of a multistage code shift differential chaotic shift keying system, and relates to a modulation technology in a wireless communication technology. A transmitter uses the orthogonal characteristic of a walsh code sequence to superpose a reference signal with reference diversity and a plurality of information bearing signals on the sametime slot to obtain a transmission signal, and the transmission signal passes through a wireless channel and is influenced by multipath fading and additive white Gaussian noise; the reference signalsdamaged by the noise are averaged by the receiver to reduce the interference of the noise on the reference signals, the denoised smooth reference signals are correlated with the information bearing signals to obtain decision variables, and hard decision is performed on the decision variables to obtain information estimation bits; and a theoretical BER of the proposed system is derived through a decision variable, and an optimal reference diversity number of the MCS-DCSK-RD system is determined according to the theoretical BER. System noise can be reduced, and the system performance is improved.

Description

technical field [0001] The invention relates to modulation technology in wireless communication technology, in particular to a reference diversity design algorithm for a multi-level code shift differential chaos shift keying system. Background technique [0002] Chaotic signals have been extensively studied in the field of wireless communication, and their inherent broadband properties and good correlation make them good candidates for spread spectrum communication. Therefore, scholars at home and abroad have proposed various communication systems based on chaos, and one of the important modulation schemes is Differential Chaos Shift Keying (DCSK) [1] . DCSK is a non-coherent system, the receiver does not need to obtain channel state information (Channel State Information, CSI), and provides excellent performance on multipath fading channels [2,3] . However, DCSK systems require half a cycle to transmit the reference signal, resulting in low data rates and low energy effi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L27/26H04L25/03H04L5/00H04J13/00
CPCH04J13/0048H04L5/0048H04L25/03012H04L25/03292H04L27/001H04L27/2613
Inventor 王琳卢雅贞苗美媛徐位凯
Owner XIAMEN UNIV
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