Framing modulation method for multimedia movable broadcast signals

Framing modulation method for multimedia movable broadcast signals

  • CN 103,763,256 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 multi-media mobile broadcast signal framing modulation method, is characterized in that it comprises the following steps:

  • 1) Multimedia Mobile broadcast signal transmission machine is deleted the input data bit of oneself the serially concatenated multi code Rate of Chinese character of flowing through the modulation of remaining convolutional encoding, code element and code element and is rotated in and on frequency domain, forms FFT coded data block, the length of FFT coded 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;

    2) Multimedia Mobile broadcast signal transmission machine adopts IFFT that FFT coded data block is transformed to time domain discrete coded data sample value piece D total=[d 0, d 1..., d k-2, d k-1];

    3) Multimedia Mobile broadcast signal transmission machine is by time domain discrete coded data sample value piece demultiplexing and according to the sequencing odd even of each the time domain discrete coded data sample value successively separated strange sub-block D of time domain discrete coded data sample value that generates very=[d 0, d 2..., d k-4, d k-2] and the even sub-block D of time domain discrete coded data sample value even=[d 1, d 3..., d k-3, d k-1];

    4) Multimedia Mobile broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the strange sub-block D of time domain discrete coded data sample value very, the even sub-block D of time domain discrete coded data sample value evencarry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete coded data sample value piece D again new, new time domain discrete coded data sample value piece D 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 18 kinds of time domain discrete coded data sample value piece D that generate pattern is synthetic new, choose wherein there is minimum peak-to-average power ratio peak-to-average power ratio time domain discrete coded data sample value piece falls , and peak-to-average power ratio time domain discrete coded data sample value piece will fall the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D *veryexpression is to the strange sub-block D of time domain discrete coded data sample value veryeach time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value sub-block that obtains;

    D *evenexpression is to the even sub-block D of time domain discrete coded data sample value eveneach time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value sub-block that obtains;

    5) Multimedia Mobile broadcast signal transmission machine Insert service index series after training sequence forms time domain embedding 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 Multimedia Mobile broadcast signal transmission machine;

    Time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete coded data sample value piece of training sequence discrete sample block;

    6) Multimedia Mobile broadcast signal transmission machine will fall peak-to-average power ratio time domain discrete coded data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete coded data sample value piece, as frame;

    7) Multimedia Mobile broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete coded data sample value piece be frame using Cyclic Prefix as protection interval, and to form signal frame, the length of Cyclic Prefix is C;

    8) Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;

    9) Multimedia Mobile broadcast signal transmission machine by baseband signal up-conversion to carrier wave.

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