A kind of entire spectrum carrier modulating method based on frequency spectrum shift

A kind of entire spectrum carrier modulating method based on frequency spectrum shift

  • CN 103,888,404 B
  • Filed: 04/10/2014
  • Issued: 11/06/2018
  • Est. Priority Date: 04/10/2014
  • Status: Active Grant
First Claim
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1. a kind of entire spectrum carrier modulating method based on frequency spectrum shift, it is characterised in that modulated including entire spectrum and send end signalProcessing and entire spectrum modulation receiving end signal processing;

  • The entire spectrum modulation transmitting terminal signal processing includes the following steps:

    (1) information source generates data information, and QPSK symbol mappings are carried out to the data information;

    (2) information after mapping symbol carries out chirp entire spectrum modulation, and the information of transmission is transformed by the modulator approachChirp signal waveforms, and move on N number of frequency point;

    The specific steps of chirp entire spectrums modulation include:

    1. transmitting the frequency band used to system, channel is divided into N number of sub-band using orthogonal frequency division multiplexi, meanwhile, productionA raw chirp swept-frequency signal with sub-band width;

    2. the symbol after QPSK maps is { 1+i, 1-i, -1+i, -1-i }, each symbolic information is converted into chirp lettersNumber waveform, while N number of chirp signal waveforms are generated, on each frequency point 1. signal of generation is moved step in, obtainThe multicarrier modulated signal of chirp has used the frequency band of whole system;

    (3) the chirp modulated signals on different frequent points are exported after adder is superimposed;

    (4) modulated signal after superposition is amplified by D/A converter and signal power, is finally sent in channel;

    The entire spectrum modulation receiving end signal processing includes the following steps:

    (a) digital signal for being suitble to processing is converted to the filtered amplifier of received signal and A/D;

    (b) system use irrelevant demodulation method, receiving terminal generate one group of corresponding local signal to received signal intoEach road symbolic information is isolated in row matched filtering;

    The demodulation method is demodulated according to chirp multi-carrier modulations, specifically includes following steps:

    1. the receiving terminal of entire spectrum modulating system first does signal the processing of correlation demodulation, N number of chirp signal waves are isolatedShape;

    2. the local signal generated is a chirp signal in minimum sub-band section;

    3. by step 1. in N number of signal for isolating and step 2. in local signal make matching coherent detection;

    The matching phaseIt closes detection to detect simultaneously using the chirp signal waveforms of two bit informations, detection performance improves;

    (c) symbol de-maps are carried out to the information isolated, exports bit information.

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