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Multi-carrier difference chaos shift keying modulation and demodulation method and modem

A multi-carrier modulation and modem technology, applied in modulation carrier systems, phase modulation carrier systems, digital transmission systems, etc., can solve the problems of poor bit error performance and high bit error rate, and achieve improved bit error performance, The effect of low bit error rate and improved bit error performance

Active Publication Date: 2016-11-23
江苏中业信息科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a multi-carrier differential chaotic shift keying modulation and demodulation method and modem, to solve the high bit error rate of the existing MC-DCSK modulation and demodulation method, Problems with poor bit error performance

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Embodiment Construction

[0034] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0035] like figure 1 As shown, the present invention has designed a kind of multi-carrier differential chaotic shift keying modulation and demodulation method, and this method specifically comprises the following steps:

[0036] Step 1: According to the bit signal-to-noise ratio E measured in the channel b / N 0 value and the number of available subcarriers M, calculate the number N of subcarriers allocated to the DCSK reference signal.

[0037] Step 2: Generate a discrete chaotic signal sequence with length β.

[0038] Step 3: Perform pulse shaping filtering on the discrete chaotic signal sequence generated in step 2 to obtain a DCSK reference signal in the current symbol period.

[0039] Step 4: Convert M-N serial data bits to be transmitted in the current symbol time into M-N parallel data bits.

[0040] Step 5: Multiply the DCSK reference signal generated ...

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Abstract

The invention discloses a multi-carrier difference chaos shift keying modulation and demodulation method and a modem. The method comprises the following steps: acquiring a DCSK reference signal in a current symbol period; converting a to-be-transmitted M-N serial data bits into M-N parallel data bits; completing information modulation and generating M-N DCSK information signals; completing multi-carrier modulation and generating N-path modulated DCSK reference signals and M-N path modulated DCSK information signals; adding N-path DCSK reference signals and M-N path DCSK information signals and then sending; completing multi-carrier modulation and respectively recovering disperse DCSK reference signal sequences and disperse DCSK information signal sequences; acquiring averaged DCSK reference signal sequence and respectively relating to M-N path disperse DCSK information signal sequences, thereby acquiring M-N related values; completing threshold judgment and outputting M-N path demodulation data bits; merging M-N path demodulation data bits into one path serial demodulation data bit stream. According to the multi-carrier difference chaos shift keying modulation demodulation method, the noise component in the judged variable can be reduced and the bit error performance of the system can be increased.

Description

technical field [0001] The invention relates to a multi-carrier differential chaotic shift keying modulation and demodulation method and a modem, belonging to the technical field of communication technology. Background technique [0002] Chaotic digital modulation technology can not only retain the characteristics of low intercept probability and reduce multipath effect of traditional spread spectrum communication system, but also shows unique advantages in many other aspects, including: reducing the hardware cost of the system; improving communication security ; Suitable for effectively distinguishing different users in a multi-user environment; improving the performance of spread spectrum communication systems, etc. Therefore, chaotic digital modulation technology has become one of the hot issues concerned and researched in the field of nonlinear science and information science. [0003] Because there is no reliable and effective method to achieve chaos synchronization at...

Claims

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Application Information

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IPC IPC(8): H04L27/20H04L27/22
CPCH04L27/2032H04L27/22
Inventor 杨华蒋国平
Owner 江苏中业信息科技有限公司
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