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Multivariate orthogonal chaos shift keying modulation/demodulation method

A modulation and demodulation, shift keying technology, applied in the field of communication, can solve the problem of low bit transmission rate, and achieve the effect of improving bit error performance, increasing bit transmission rate, and low bit error rate

Active Publication Date: 2015-12-23
NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the bit transmission rate of the existing chaotic digital modulation and demodulation method is on the low side, and propose a multivariate orthogonal chaotic shift keying modulation and demodulation method. The repeated chaotic signal generator of the method produces a length of Nβ The discrete repetitive chaotic signal; according to the discrete repetitive chaotic signal, use the Hilbert orthogonal transformation to generate 2-way orthogonal basis functions; use the Walsh sequence of length N to weight the generated 2-way orthogonal basis functions respectively, and generate 2N-way chaotic orthogonal basis functions Basis function; use the first orthogonal basis function as a reference signal, and transmit it in the same phase channel; use a state encoder to convert the current information bits to be transmitted into 2N state coefficients, and each state coefficient is respectively orthogonal to the corresponding chaos The basis functions are multiplied, and the generated multivariate orthogonal modulation signal is transmitted in the orthogonal channel

Method used

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  • Multivariate orthogonal chaos shift keying modulation/demodulation method

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Embodiment 1

[0042] Such as figure 1 As shown, when the number Nβ of discrete chaotic samples in one symbol time is selected as 128, the condition of N=4 is used to implement 8-element orthogonal chaotic shift keying.

[0043] Such as figure 2 As shown, the working process of the repetitive chaotic signal generator is as follows:

[0044] (1) In the first time slot [0, T s ], the switch S1 is directly connected to the chaotic signal generator, and the repeated chaotic signal generator directly outputs β (β=32) discrete chaotic signal samples generated by the current chaotic signal generator; in the second time slot [T s ,2T s ], switch S 1 Connected with the delay unit D1, the repetitive chaotic signal generator delays the output signal of the chaotic signal generator by 32 points and outputs it, that is, outputs the signal output in the first time slot again; and so on, after 4 Within a symbol time [0, T] composed of time slots, the repetitive chaotic signal generator repeats the ou...

Embodiment 2

[0074] Such as figure 2 As shown, the present invention also designs a kind of repetitive chaotic signal generator, and this generator uses N-1 road delay unit, produces the discrete repetitive chaotic signal that length is Nβ, the signal of this discrete repetitive chaotic signal in each time slot same. Its structure includes: chaotic signal generator, N-1 delay unit D with delay of β 1 ,D 2 ,...D N-1 and toggle switch S 1 .

[0075] Such as image 3 As shown, the present invention also designs a kind of multivariate orthogonal chaotic shift keying modulator, and its structure comprises: repeat chaotic signal generator, N order Walsh code generator G 1 , State encoder, Hilbert transformer, 2N coefficient multipliers, 2N weighted multipliers, 2 pulse shaping filters, 2 carrier multipliers and 1 adder.

[0076] Such as Figure 4 As shown, the present invention also designs a kind of multivariate orthogonal chaos shift keying demodulator, and its structure comprises: N ...

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Abstract

The invention discloses a multivariate orthogonal chaos shift keying modulation / demodulation method. According to the method, Hilbert orthogonal transformation and orthogonal Walsh sequence weighting are carried out chaos signals to construct a plurality of mutually- orthogonal chaos carrier signals; and the modulation / demodulation is carried out by utilizing a multivariate orthogonal modulation method. According to the multivariate orthogonal chaos shift keying modulation / demodulation method, the delay units in the existing binary / N-nary DCSK receivers are eliminated, the delay units in transmitters are decreased, the realizing complexity is reduced, the bit transmission speed of the system is greatly improved and the bit error rate performance of the system is enhanced to a relatively great extent.

Description

technical field [0001] The invention relates to a multivariate orthogonal chaotic shift keying modulation and demodulation method, which belongs to the technical field of communication. technical background [0002] At present, the typical application of chaos theory in secure communication and spread spectrum communication, its 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 show many other aspects. It has unique advantages, 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....

Claims

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Application Information

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IPC IPC(8): H04L27/00H04L27/36
CPCH04L27/001H04L27/362
Inventor 杨华蒋国平
Owner NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD
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