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A kind of multi-carrier differential chaotic shift keying modulation and demodulation method and modem

A modem, shift keying technology, applied in phase modulation carrier system, modulated carrier system, digital transmission system, etc., can solve the problems of high bit error rate and poor bit error performance, and achieve low bit error rate, improved bit error performance, and the effect of improving bit error performance

Active Publication Date: 2019-05-17
江苏中业信息科技有限公司
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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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  • A kind of multi-carrier differential chaotic shift keying modulation and demodulation method and modem
  • A kind of multi-carrier differential chaotic shift keying modulation and demodulation method and modem
  • A kind of multi-carrier differential chaotic shift keying modulation and demodulation method and modem

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Embodiment Construction

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

[0035] Such as 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 generat...

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Abstract

The invention discloses a multi-carrier differential chaotic shift keying modulation and demodulation method and a modem. The method includes: obtaining a DCSK reference signal in the current symbol period; converting M-N serial data bits to be transmitted into M-N Road parallel data bits; complete information modulation, generate M-N road DCSK information signals; complete multi-carrier modulation, generate N road modulated DCSK reference signals and M-N road modulated DCSK information signals; N road DCSK reference signals It is added to the M-N channel DCSK information signal and sent; the multi-carrier demodulation is completed, and the discrete DCSK reference signal sequence and the discrete DCSK information signal sequence are recovered respectively; the averaged discrete DCSK reference signal sequence is obtained, and the M-N channel The discrete DCSK information signal sequences are correlated separately to obtain M-N correlation values; the threshold judgment is completed, and M-N channels of demodulated data bits are output; the M-N channels of demodulated data bits are combined into 1 channel of serial demodulated data bit streams . The invention can reduce the noise component in the decision variable and improve the bit error performance of the system.

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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Patent Type & Authority Patents(China)
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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