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Transform domain communication system and its realization method

A communication system and transform domain technology, applied in multi-carrier systems and other directions, can solve the problem of low spectrum utilization rate of TDCS system, and achieve the effect of improving spectrum utilization rate and data transmission rate

Inactive Publication Date: 2014-10-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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

Method used

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  • Transform domain communication system and its realization method
  • Transform domain communication system and its realization method
  • Transform domain communication system and its realization method

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] figure 1 It is a system block diagram of the transmitting end of the transform domain communication system of the present invention, including a first random phase spectrum sequence generating module for generating a spectrum random phase sequence, a first Fourier inverse transform module 161, a first CCSK modulation module 171, a second CCSK modulation module 172, first imaginary number multiplier module 18 and branch signal superposition module 19, wherein,

[0043] The first inverse Fourier transform module 161 is used to perform inverse Fourier transform on the spectrum random phase sequence generated by the first random phase spectrum sequence generation module;

[0044] The first CCSK modulation module 171 is used to perform circular cycle modulation on the basic modulation waveform output by the first inverse Fourier transform module, and use t...

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Abstract

The invention discloses a transform domain communication system and a realization method thereof. The transmitting end includes a first random phase spectrum sequence generation module and a first inverse Fourier transform module, and is characterized in that it also includes a first CCSK modulation module, a second CCSK modulation module, an imaginary multiplier module and a tributary signal superposition module; The receiving end includes a second random phase spectrum sequence generation module, a signal conjugate module, a Fourier transform module, a first multiplier module, a second inverse Fourier transform module, a real number data extraction module, an imaginary number data extraction module, a first a peak search module and a second peak search module. The system and method of the present invention utilizes the characteristic that the maximum value in the circular cyclic autocorrelation function is a real number, and loads the basic modulation waveform through the real number branch and the imaginary number branch respectively to load different data streams, thereby improving the data transmission rate of the transform domain communication system , thereby improving the system spectrum utilization.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/32
Inventor 胡苏毕国安李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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