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Method for demodulating chaotic pulse position modulated communication system

A technology of pulse position modulation and demodulation method, applied in the field of communication, can solve the problems of digital information error judgment, error propagation, parameter mismatch, etc., and achieve the effect of solving high bit error rate

Inactive Publication Date: 2013-10-30
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0003] (1) When the actual system is disturbed and the synchronization error occurs, it will lead to wrong judgment of digital information, and because the delay link is in the feedback loop, each chaotic map contains the sequence information sent, so the wrong demodulation will lead to error propagation;
[0004] (2) There will always be a parameter mismatch between the sending end and the receiving end of the actual system, which will lead to synchronization errors between sending and receiving, and the accumulation of synchronization errors will generate a large number of bit errors

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  • Method for demodulating chaotic pulse position modulated communication system
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  • Method for demodulating chaotic pulse position modulated communication system

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Embodiment Construction

[0017] The present invention is a demodulation method of a chaotic pulse position modulation communication system based on particle filter. The working principle of the system is as follows:

[0018] The chaotic pulse position modulation communication system puts the binary digital information to be sent into the feedback loop, and converts the original chaotic map combined with the data information into a new map to realize modulation. The mathematical model of the system dynamic equation is:

[0019] T n+1 =F(T n )+S n+1 ×d (1)

[0020] where T n is the pulse interval, F(T n ) is the chaotic mapping function, S n It is the binary information sent by the system, which is "0" or "1", and d is the delay length caused by sending data.

[0021] in transmitter principle figure 1 Among them, the integration circuit generates a linearly increasing voltage according to the delay of the signal, which is compared with the threshold generated by the sample-and-hold circuit and t...

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Abstract

The invention provides a chaotic pulse position modulation demodulation method based on a particle filter algorithm, and aims to solve the problem of high bit-error rate of a chaotic pulse position modulated communication system caused by factors such as parameter mismatch and unsatisfactory synchronizing characteristics of a receiver and a transmitter. According to a mathematical model of the system, a demodulation terminal utilizes a particle filter to track a real modulated signal by an on-line separation method and study the performance of the proposed system according to the effect of tracking the real signal and the bit-error rate of the system. The simulation result shows that: compared with the traditional chaotic pulse position modulation method, the method provided by the invention can track the real signal well, has good synchronization robustness and reduce the error propagation which is caused by the misjudgment of a data so as to greatly reduce the bit-error rate.

Description

technical field [0001] The invention belongs to the field of communication, in particular to a demodulation method of a chaotic pulse position modulation communication system. Background technique [0002] In recent years, chaotic signals have been widely used in the field of communication due to their good secrecy and aperiodicity. Considering the actual communication conditions, the chaotic signal has strict requirements on the channel, filtering and communication noise. The chaotic pulse position modulation system uses the interval between adjacent pulses to carry information, thereby reducing the negative effects of channel distortion and filtering, and fully utilizing the security performance of chaos to enhance the reliability of the system. Since the chaotic pulse position modulation system demodulates the digital information of the system through the pulse position, the system has high requirements on the synchronization of the sending end and the receiving end, and...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B14/02H04L9/00
Inventor 李辉恩德刘小磊张炜胡松华
Owner HENAN POLYTECHNIC UNIV
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