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Three-channel carrier index differential chaos shift keying modem and method

A technology of shift keying and three-way carrier, applied in modulation carrier system, secure communication through chaotic signal, digital transmission system, etc., can solve the problems of low transmission rate and low spectrum utilization

Active Publication Date: 2019-04-05
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a three-way carrier index differential chaotic shift keying modem and method, to solve the problem of low transmission rate and low spectrum utilization rate of the existing CI-DCSK modulation and demodulation method technical problem

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  • Three-channel carrier index differential chaos shift keying modem and method
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  • Three-channel carrier index differential chaos shift keying modem and method

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Embodiment 1

[0106] An embodiment of the present invention is a three-way carrier index differential chaotic shift keying modulation method. At the sending end, three-way carrier index differential chaotic shift keying modulation is performed on the signal, see figure 1 , including the following procedures:

[0107] Step 1: If the transmitted serial data bits need 3p-2, then M=2 is required p +1 subcarrier. The frequency band required for signal transmission is divided into M+1 subcarrier frequency bands, and the frequencies are , and their serial numbers correspond to 1, 2,..., M+1 respectively.

[0108] Step 2: In order to ensure the autocorrelation of the chaotic signal, the length of the discrete chaotic signal sequence is generally greater than or equal to 16. In 1 symbol period [0, T b ], the chaotic signal generator outputs a discrete chaotic signal sequence with a length of 16 ;

[0109] Step 3: In 1 symbol period [0, T b ], pass the discrete chaotic signal sequence genera...

Embodiment 2

[0148] With the same inventive concept as the above-mentioned modulation method, the present invention also provides a three-way carrier index differential chaotic shift keying modulator, such as figure 2 shown, including:

[0149] 1 chaotic signal generator, 1 Hilbert filter, 2 pulse shaping filters, 1 serial-to-parallel converter, 3 index mappers, 1 cyclic shifter, 2M+1 modulation multiplier , M modulation adders, M+1 carrier multipliers and 1 carrier adder.

[0150] The 1 chaotic signal generator is used to generate discrete chaotic signal sequences;

[0151] The 1 Hilbert filter is used to generate a discrete Hilbert signal sequence through Hilbert transform on the discrete chaotic signal sequence;

[0152] The pulse-shaping filter 1 in the two pulse-shaping filters is used to perform pulse-shaping filtering on the discrete chaotic signal sequence to generate a chaotic pulse signal in the current symbol period ;Pulse shaping filter 2 is used to perform pulse shaping f...

Embodiment 3

[0177] The embodiment of the present invention is a three-way carrier index differential chaotic shift keying demodulation method, at the receiving side, the signal is received and demodulated, see figure 1 As shown, it specifically includes the following steps:

[0178] Step S1: Through the carrier multiplier T 1 , T 2 ,...,T M+1 , the receiving side compares the signal received by the antenna with the frequency The 33 synchronous subcarriers are multiplied separately to generate 33 product signals;

[0179] Step S2: Pass through the matched filter F 1 , F 2 ,...,F M+1 , the 33 product signals generated in step S1 are respectively subjected to matched filtering through 33 filters matched with the pulse shaping filter used in step 4 of the modulation method;

[0180] Step S3: Through the sampling switch K 1 , K 2 ,...,K M+1 , respectively, the matched filter F 1 , F 2 ,...,F M+1 The output is sampled in the time domain, and 33 discrete information signal sequence...

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Abstract

The invention discloses a three-channel carrier index differential chaos shift keying modem and method, which belong to the technical field of chaos communication. Three-channel index modulation is realized by two layers in an inter-channel mutual reference mode, the two layers of modulation are distinguished by chaotic signals and Hilbert signals which are mutually orthogonal, and the signals aremodulated and demodulated by using an index mapping rule and an anti-index mapping rule. On the premise of occupying the same frequency band, in comparison with the existing carrier index differential chaos shift keying system whose reference signals only serve as reference of information signals but do not carry any information, the information signals of each layer in the invention can also serve as reference signals for other layers in the case of information bit transmission, independent reference signals do not need to be transmitted additionally, and thus, a higher bit transmission rate, a higher spectrum utilization rate and better data security can be acquired, and the bit error rate can also be reduced.

Description

technical field [0001] The invention belongs to the technical field of chaotic communication, and relates to a multi-carrier chaotic communication system using carrier index modulation, in particular to a three-way carrier index differential chaotic shift keying modem and method. Background technique [0002] In recent years, chaotic signals have broad development prospects and great practical value in the field of communication and information due to their good autocorrelation and sensitivity to initial values. Chaotic signals not only have good auto-correlation and cross-correlation, but also have statistical properties similar to white noise, which make chaotic signals very suitable for use as spreading codes in spread-spectrum communication. At the same time, by using the sensitivity of the chaotic signal to the initial value, a large number of approximately orthogonal chaotic signals can be obtained by changing its initial value. This characteristic is suitable for dist...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04L9/00H04B1/7176
CPCH04B1/7176H04L9/001H04L27/001
Inventor 杨华戴文浩夏磊庞子扬徐思远李姝
Owner NANJING UNIV OF POSTS & TELECOMM
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