Three-way carrier index differential chaotic shift keying modem and method
A technology of shift keying and three-way carrier, which is applied in modulation carrier system, secure communication through chaotic signal, digital transmission system, etc. It can solve the problems of low transmission rate and low spectrum utilization rate, and achieve good bit error rate performance, improve bit error rate performance, and improve spectrum utilization
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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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