Mobile signal transmission method for digital broadcast single frequency network

Mobile signal transmission method for digital broadcast single frequency network

  • CN 103,763,083 A
  • Filed: 01/13/2014
  • Published: 04/30/2014
  • Est. Priority Date: 01/13/2014
  • Status: Active Application
First Claim
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1. a mobile signal transmission method for digital broadcast single-frequency network, is characterized in that it comprises the following steps:

  • 1) the centre data manager of single frequency network converts the multi-medium data media data processor of flowing through to bit stream, and the scrambler sequence of utilizing feedback shift register to produce is carried out scrambling processing to form input data bit flow;

    2) the network data management device of single frequency network is rotated in the flow through code element modulation of input data bit on frequency domain and forms FFT data block with code element, and the length of FFT data block is K, and the numerical value of K is got even number;

    Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping;

    Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree;

    3) the network data management device of single frequency network adopts space-frequency coding device that code check is 1 that the FFT data block forming on frequency domain is modulated to and in each digital broadcast mobile signals transmitter branches in single frequency network, forms empty frequency modulation FFT data block processed, and the time synchronized of adjusting each digital broadcast single-frequency network movable signal transmitter branches is all processed empty frequency modulation FFT data block processed at one time with all transmitters in assurance network;

    4) each digital broadcast mobile signals transmitter in single frequency network adopts IFFT that empty frequency modulation FFT data block processed is transformed to sky frequency modulation time domain discrete data sample block D processed total=[d 0, d 1..., d k-2, d k-1];

    5) each digital broadcast mobile signals transmitter in single frequency network is by empty frequency modulation time domain discrete data sample block demultiplexing processed and according to the sequencing odd even of each the empty frequency modulation time domain discrete data sample processed successively separated strange sub-block D of empty frequency modulation time domain discrete data sample processed that generates very=[d 0, d 2..., d k-4, d k-2] and the even sub-block D of empty frequency modulation time domain discrete data sample processed even=[d 1, d 3..., d k-3, d k-1];

    6) each digital broadcast mobile signals transmitter in single frequency network passes through peak-to-average power ratio adjustment unit to the strange sub-block D of empty frequency modulation time domain discrete data sample processed very, the even sub-block D of empty frequency modulation time domain discrete data sample processed evencarry out signal power adjustment and corresponding signal and process also synthetic new empty frequency modulation time domain discrete data sample block D processed again new, new empty frequency modulation time domain discrete data sample block D processed newadopt following generate pattern to obtain, generate pattern 1 is D new=[D very, D even], generate pattern 2 is generate pattern 3 is generate pattern 4 is generate pattern 5 is generate pattern 6 is generate pattern 7 is D new=[D *very, D even], generate pattern 8 is generate pattern 9 is generate pattern 10 is generate pattern 11 is generate pattern 12 is generate pattern 13 is D new=[D very, D *even], generate pattern 14 is generate pattern 15 is generate pattern 16 is generate pattern 17 is generate pattern 18 is compare the synthetic empty frequency modulation time domain discrete data sample block D processed of 18 kinds of generate patterns new, choose wherein there is minimum peak-to-average power ratio the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed falls and the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed will be fallen the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D *veryexpression is to the strange sub-block D of empty frequency modulation time domain discrete data sample processed veryeach sky frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample sub-block processed that obtains;

    D *evenexpression is to the even sub-block D of empty frequency modulation time domain discrete data sample processed eveneach sky frequency modulation time domain discrete data sample processed carry out conjugate operation processing and the empty frequency modulation time domain discrete data sample sub-block processed that obtains;

    7) each digital broadcast mobile signals transmitter Insert service index series after training sequence in single frequency network forms time-domain training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing each digital broadcast mobile signals transmitter in single frequency network;

    8) each digital broadcast mobile signals transmitter in single frequency network inserts and falls the empty frequency modulation of peak-to-average power ratio time domain discrete data sample block processed using Cyclic Prefix as protection interval, the empty frequency modulation of peak-to-average power ratio time domain cyclic prefix discrete data sample block processed falls in formation, as frame, the length of Cyclic Prefix is C;

    9) each digital broadcast mobile signals transmitter in single frequency network is that frame head is inserted into that to fall the empty frequency modulation of peak-to-average power ratio time domain cyclic prefix discrete data sample block processed be frame by time-domain training sequence discrete sample block, to form signal frame;

    10) each digital broadcast mobile signals transmitter in single frequency network adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;

    11) each digital broadcast mobile signals transmitter in single frequency network forms emission of radio frequency signals to on-air radio channel by baseband signal up-conversion to carrier wave;

    12) radiofrequency signal that each digital broadcast mobile signals transmitter in the detection of the digital broadcast mobile signals receiver in single frequency network reception single frequency network sends also forms baseband signal by its down-conversion, utilizes the architectural characteristic of training sequence characteristic and signal frame to carry out baseband signal reception &

    disposal.

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