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A Construction Method of Digital-Analog Hybrid Chaos Code

A construction method and digital-analog hybrid technology, applied in the field of physical layer coding, can solve the problems of strengthening protection and not using signal sources, etc., and achieve the effect of reducing additional noise

Active Publication Date: 2020-12-08
TONGJI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, neither the previous single-channel chaotic codes nor the CAT using dual-channel chaotic codes have used these symbolic characteristics in the construction of codewords to strengthen the protection of information sources.

Method used

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  • A Construction Method of Digital-Analog Hybrid Chaos Code
  • A Construction Method of Digital-Analog Hybrid Chaos Code
  • A Construction Method of Digital-Analog Hybrid Chaos Code

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Embodiment

[0035] The invention proposes a construction method of a digital-analog mixed chaotic code based on a nonlinear chaotic function, which is used to protect an analog signal source with a continuous time discrete amplitude and is suitable for a physical layer in a wireless communication system. The digital-analog mixture in the present invention is embodied in that the generated codewords are divided into simulated chaotic codewords (the amplitude is a real number) and symbols of partial chaotic codewords (the amplitude is -1 or 1, which is a digital signal). Under the white Gaussian noise (AWGN) channel, the present invention deduces the theoretical expression of MSE after decoding, and the sending end automatically adjusts parameters according to the expression to achieve the purpose of minimizing MSE. Compared with the traditional analog chaotic code, the invention can significantly reduce the additional noise of the decoded signal source.

[0036] figure 1 Schematic flow ch...

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Abstract

The invention relates to a method for constructing a digital-analog hybrid chaotic code. The method includes the following steps that: (1) according to the scheme of the invention, information sourcesare analog signals with discrete time and continuous amplitudes; when the code rate is 1 / N, an encoder encodes each information source into N code words based on a nonlinear chaotic function; the N code words are divided into two parts, that are separately N1 analog code words and N2 digital code words, wherein N2 is less than or equal to N1, and N1+N2 is equal to N; the encoder selects optimal parameters N1 and N2 according to a theoretical expression of a mean square error (MSE) after decoding and a predicted channel signal-to-noise ratio (SNR) to ensure that the MSE after decoding of a receiving end is minimized; (2) a transmitting end constitutes the code words generated by a frame of information source into a data packet according to a certain format, and sends the data packet to a wireless channel; and (3) the receiving end performs maximum likelihood decoding on the received analog chaotic code words and digital code words. Compared with the prior art, the scheme of the invention can significantly reduce the MSE after decoding.

Description

technical field [0001] The invention relates to a physical layer coding in a wireless communication system, in particular to a construction method of a digital-analog mixed chaotic code. Background technique [0002] In wireless communication systems, some sources are naturally analog, such as audio signals, image signals, biological signals, and so on. These sources can therefore be directly protected using analog channel coding. Wolf and Marshall independently proposed the concept of analog coding in the 1980s. Chen and Wornell of MIT first proposed the concept of simulating chaotic coding in the 1990s. The simulated chaotic coding uses the butterfly effect of the nonlinear chaotic function to protect the signal source with continuous time discrete amplitude. The decoder uses maximum likelihood estimation to recover the source. Since the magnitude of the source is a real number, the value of the source cannot be fully recovered, but the additional noise of the source ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H03M1/66H03M13/11
CPCH03M1/66H03M13/1105H04L1/0008H04L1/0054H04L1/0057
Inventor 于威吴俊黄新林王睿刘典陈向煌
Owner TONGJI UNIV
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