Weighted score Fourier transform-based variable parameter spread spectrum sequence low-detection probability signal emitting and receiving method

A technology of fractional Fourier transform and signal transmission, which is applied in the field of communication, can solve the problems of poor anti-interception ability and achieve the effect of improving anti-interception ability

Active Publication Date: 2013-05-01
HARBIN INST OF TECH
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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 syst

Method used

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  • Weighted score Fourier transform-based variable parameter spread spectrum sequence low-detection probability signal emitting and receiving method
  • Weighted score Fourier transform-based variable parameter spread spectrum sequence low-detection probability signal emitting and receiving method
  • Weighted score Fourier transform-based variable parameter spread spectrum sequence low-detection probability signal emitting and receiving method

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specific Embodiment approach 1

[0043] Specific implementation mode 1. Combination figure 1 and figure 2 Describe this specific embodiment, based on weighted fractional Fourier transform variable parameter spread spectrum sequence low detection probability signal transmission and reception method,

[0044] Its signal emission method is implemented by the following steps:

[0045] Step A1, performing digital baseband mapping on the data of the data source to obtain a digital baseband signal;

[0046] Step A2, using the spreading code generation module to generate a spreading code sequence with a length of N; N is a real number;

[0047] Step A3, the digital baseband signal obtained in step A1 adopts the length of N spread code sequence generated by step A2 to carry out N times spread spectrum in the spread spectrum encoding module, and obtains the signal after serial spread spectrum encoding of length N;

[0048] Step A4, performing serial / parallel conversion on the serial spread-spectrum coded signal wit...

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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...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26
Inventor 沙学军房宵杰吴玮白旭吴宣利李卓明
Owner HARBIN INST OF TECH
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