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Modulation and demodulation method of wave form synergy signal based on frequency domain and fractional Fourier domain orthogonal basis function

A technology of fractional Fourier and orthogonal basis functions, which is applied in the field of signal modulation and demodulation, and can solve the problems of low efficiency of signal modulation and demodulation methods

Active Publication Date: 2015-01-28
HARBIN INST OF TECH
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Problems solved by technology

[0005] The present invention aims to solve the problem of low efficiency of the existing quadrature phase shift keying (QPSK) signal modulation and demodulation methods, thereby providing a waveform cooperative signal modulation and demodulation based on the orthogonal basis functions in the frequency domain and the fractional Fourier domain. tune method

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  • Modulation and demodulation method of wave form synergy signal based on frequency domain and fractional Fourier domain orthogonal basis function
  • Modulation and demodulation method of wave form synergy signal based on frequency domain and fractional Fourier domain orthogonal basis function
  • Modulation and demodulation method of wave form synergy signal based on frequency domain and fractional Fourier domain orthogonal basis function

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specific Embodiment approach 1

[0043] Specific implementation mode 1. Combination Figure 1 to Figure 7 Describe this specific implementation mode, based on frequency domain and fractional Fourier domain normal

[0044] The waveform cooperative signal modulation and demodulation method of the cross basis function, and its signal modulation method is realized by the following steps:

[0045] Step 1, performing serial / parallel conversion on the baseband signal into four parallel symbols, namely: a symbol, b symbol, c symbol and d symbol;

[0046] Step 2, carry out cosine carrier modulation to the a-th road symbol, obtain the modulated a-th road signal; carry out the b-th road symbol to carry out chirp signal modulation, obtain the b-th road signal after modulation; the a-th road after modulation Combining the signal with the modulated b-th signal to obtain the first composite signal;

[0047] Carry out sine carrier modulation to the c-th road symbol to obtain the c-th road signal after modulation; carry out...

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Abstract

A modulation and demodulation method of a wave form synergy signal based on a frequency domain and a fractional Fourier domain orthogonal basis function relates to a signal modulation and demodulation method, and aims at solving the problem that a modulation and demodulation method of an existing quaternary phase shift keying (QPSK) signal is low in efficiency. Modulation and demodulation are achieved by a way of wave form synergy of a chirp signal and a sine and cosine signal, and therefore the modulation and demodulation method of the wave form synergy signal based on the frequency domain and the fractional Fourier domain orthogonal basis function is a novel modulation and demodulation method. In addition, two branches of chirp signals are respectively added to an I branch and a Q branch modulated by the existing QPSK signal and are used as carrier waves to respectively modulate one branch of baseband signal, so that existing two-way modulation is added up to four-way modulation, and at the demodulation end, filter waves are combined and matched by using a frequency domain template and a fraction domain template, and eight integrators are designed, and finally filtering results are combined so as to judge the information bit. The modulation and demodulation method is appropriate for the wireless communication field.

Description

technical field [0001] The invention relates to a signal modulation and demodulation method, in particular to a modulation and demodulation method based on waveform coordination of frequency domain and fractional Fourier domain orthogonal basis functions. Background technique [0002] In the ordinary quadrature phase-shift keying (QPSK) signal modulation process, the baseband signal is divided into I-channel and Q-channel two-channel signals after serial / parallel conversion, and each channel is added with an orthogonal carrier signal. The signal and the cosine signal are used as carrier signals to modulate one baseband signal respectively, and then synthesized and then transmitted. [0003] The orthogonal basis function of fractional Fourier transform, also known as chirp signal, can be expressed as In practice, the real part cos(wt+kt 2 ) said, where w is the angular frequency, and k is called the modulation frequency. The frequency of the signal is a signal whose frequ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/18
Inventor 沙学军李勇吴宣利房宵杰李月吴玮李卓明
Owner HARBIN INST OF TECH
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