Low detection probability signal transmission and reception method of variable parameter spread spectrum sequence based on weighted fractional Fourier transform

Abstract

The invention discloses a weighted score Fourier transform-based variable parameter spread spectrum sequence low-detection probability signal emitting and receiving method, relating to the field of communication and solving the problem of poor interception and capture resisting capacity of the existing direct sequence spread spectrum communication system. A signal emitting process of the weighted score Fourier transform-based variable parameter spread spectrum sequence low-detection probability signal emitting and receiving method comprises the steps of: carrying out digital baseband mapping, spread spectrum and serial / parallel conversion on data of a data source and then dividing a signal into M segments; and respectively carrying out weighted score Fourier transform, then synthesizing one section of signal and carrying out parallel / serial transform, digital carrier modulation, digital / analog conversion, filter and up-conversion and then sending the signal to a channel. A signal receiving method of the weighted score Fourier transform-based variable parameter spread spectrum sequence low-detection probability signal emitting and receiving method comprises the steps of: carrying out down conversion, filter, analog / digital conversion, digital carrier demodulation and serial / parallel conversion on the received signal, and dividing the signal into M segments, respectively carrying out weighted score Fourier transform and merging into one section of decrypted signal; and then carrying out parallel / serial conversion, dispreading and digital baseband demapping and then outputting. The weighted score Fourier transform-based variable parameter spread spectrum sequence low-detection probability signal emitting and receiving method is suitable for wireless communication.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for transmitting and receiving a variable parameter spread spectrum sequence signal based on weighted fractional Fourier transform. Background technique [0002] In recent decades, with the rapid development of computer technology and communication technology, the transmission and exchange of information has become ubiquitous in people's daily life, and information security issues have always accompanied it, and with the deepening of social information , this issue has received increasing attention. The so-called confidential communication is to prevent communication technology from being stolen, and to adopt concealed means for secret information and its transmission mode in the communication process, so as to achieve the purpose of confidentiality. [0003] Among the traditional signal anti-intercept technologies, the most mature and widely used one is the direct sequence sp...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor anti-intercept ability of the existing direct sequence spread spectrum communication system, thereby providing a method for transmitting and receiving signals with variable parameter spread spectrum sequences based on weighted fractional Fourier transform

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