OFDM-DCSK communication system

A technology of OFDM-DCSK, 1.OFDM-DCSK, applied in the field of wireless communication

Active Publication Date: 2015-05-13
HARBIN INST OF TECH
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Problems solved by technology

[0011] The present invention is to increase the data rate and solve the RF delay problem in the OFDM-DCSK system, thereby providing an OFDM-DCSK communication system

Method used

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specific Embodiment approach 1

[0045] Specific implementation mode 1. Combination Figure 1 to Figure 3 Describe this specific embodiment, the OFDM-DCSK communication system,

[0046] The signal transmission method of the OFDM-DCSK communication system is:

[0047] Step 1, under the transmission of each frame OFDM-DCSK, the original information bit b=[b 0 ,b 1 ,...,b M×L ]∈{0,1} is modulated by BPSK to obtain a serial modulation sequence d; M+1 is the number of subcarriers;

[0048] Step 2: Perform serial / parallel conversion on the serial modulation sequence d to obtain L groups of parallel sequences; for the lth group of subcarriers, the parallel sequences are expressed as m=1, 2,..., M; l=1, 2,..., L; β is the spreading factor;

[0049] Step 3: Use the chaotic reference sequence x l information bit Spread spectrum is and allocated to the mth subcarrier of the lth group;

[0050] The chaotic reference sequence x l Produced by the 2nd order Chebyshev inequality (CPF);

[0051] Among them: the ...

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Abstract

The invention discloses an OFDM-DCSK (Orthogonal Frequency Division Multiplexing-Differential Chaos Shift Keying) communication system and relates to the wireless communication field. The purpose of the invention is that the data rate is increased in the OFDM-DCSK communication system to solve the delay problem of RF (radio frequency). As an irrelevant chaos communication solution, all subcarriers are divided into several groups, chaos reference sequences are transmitted by the central subcarrier in each group, and modulated data streams are transmitted by the subcarriers in the residual groups. Thus, in comparison with a traditional DCSK system, the spectrum utilization rate is improved by a transmitting structure. The received data on a receiving end isn't demodulated by a radio frequency delay circuit, so that a convenient condition is provided to the system in practical application. The system is applied to wireless communication occasions.

Description

technical field [0001] The invention relates to the field of wireless communication. Background technique [0002] The chaotic signal has the following characteristics: non-periodic, deterministic, noise-like, broadband and easy to generate. In recent years, chaotic communication systems have been extensively studied. In the past few years, a series of chaotic modulation schemes have been proposed, among which differential chaotic shift keying (DCSK) is the most popular due to its good anti-noise performance and simple transmission requirements. It is suitable for the actual modulation method. See Document 1 published in 2011: "Performance analysis of differential chaotic shift keying communications in MIMO systems" and Document 2 published in 2004 "Exact analytical bit error rates for multiple access chaos-based communication systems"; [0003] In order to improve the spectrum utilization of the DCSK system, High-efficiency DCSK (HE-DCSK) was proposed in Document 3: "High...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2697
Inventor 赵雅琴李书营任广辉吴芝路米雪龙
Owner HARBIN INST OF TECH
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