OFDM-based anonymous communication waveform generation method

Abstract

The invention provides an OFDM-based anonymous communication waveform generation method. The method comprises the following steps: S1, defining the total number of OFDM channels N and the number of OFDM channels for actual signal transmission n for digital signals, and carrying out serial-to-parallel conversion grouping according to the number of OFDM carriers and the QPSK signal mode; S2, carrying out phase mapping on the basis of digital symbols in the QPSK signal format; S3, carrying out IFFT conversion for a plurality of generated symbol matrixes in the DQPSK format, modulating the digital signals to the corresponding carriers so as to form digital multi-carrier symbol matrixes, and carrying out additional guard interval processing and additional noise processing of each frame of the matrixes; and S4, forming emitting digital symbol row matrixes, and finally carrying out digital-to-analogue conversion to form communication signals based on the DQPSK and the OFDM digital modulation modes. The method provided by the invention has the advantages that a flexible selection of the channels can achieve the anonymous effect, so that communication decryption is difficult; and the internal signal modulation mode of communication adopts the DQPSK modulation mode.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an OFDM-based concealed communication waveform generation method. Background technique [0002] In modern communication, traditional concealed communication methods such as frequency hopping communication technology and secret communication technology have exposed great disadvantages. On the one hand, because the frequency hopping communication technology requires a large signal-to-noise ratio at the receiving end, with the continuous improvement of the performance of the reconnaissance detection equipment, the frequency spectrum of the FM signal can be clearly seen on the reconnaissance detection equipment and related communication deciphering; On the one hand, secure communication technology equipment and algorithms are complex and costly. They have good use value in a few occasions where high-level information is transmitted, but they appear to be too cost-effective in o...

AI Technical Summary

Problems solved by technology

On the one hand, because the frequency hopping communication technology requires a large signal-to-noise ratio at the receiving end, with the continuous improvement of the performance of the reconnaissance detection equipment, the frequency spectrum of the FM signal can be clearly seen on the reconnaissance detection equipment and related communication deciphering; On the one hand, secure communication technology equipment and algorithms are complex and costly, and they have good use value in a few occasions where high-secret information is transmitted, but they are too cost-effective in occasions where the transmission confidentiality is not high but confidentiality requirements are required

Images