Transform domain communication system and realization method thereof

Abstract

The invention discloses a transform domain communication system and a realization method of the transform domain communication system. A transmitting terminal comprises a first random phase frequency spectrum sequence generating module and a first inverse Fourier transform module, and the transform domain communication system is characterized in that a first CCSK (Circular Cyclic Shift Keying) modulation module, a second CCSK modulation module, an imaginary number multiplying unit module and a branch signal superposition module are arranged; a receiving terminal comprises a second random phase frequency spectrum sequence generating module, a signal conjugating module, a Fourier transform module, a first multiplying unit module, a second inverse Fourier transform module, a real number data extracting module, an imaginary number data extracting module, a first peak searching module and a second peak searching module. According to the system and the method disclosed by the invention, the characteristic that the maximum value in a circular cyclic self-correlation function is real number is utilized, and different data flows are loaded on a base modulation waveform by a real number branch and an imaginary number branch, so that the data transmission rate of the transform domain communication system is increased, and further the utilization ratio of the system frequency spectrum is increased.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a transform domain communication system and an implementation method thereof. Background technique [0002] In the transform domain communication system (Transform Domain Communication System, TDCS), in order to make full use of idle spectrum resources, the TDCS system decomposes the idle frequency band into a series of independent spectrums, and combines the random phase generation module to generate the basic modulation waveform of the TDCS system. Circular Cyclic Shift Keying (CCSK) generates the final transmission signal. In the above way, the transmitted signal has statistical characteristics similar to noise, and thus has a low detection probability (mainly for unauthorized users). The disadvantage of this scheme is that the existing tDCS system represents the transmitted data through the circular cycle offset of CCSK modulation. For example, CCSK modulat...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low frequency spectrum utilization in the existing tDCS system, and propose a transform domain communication system

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