A method for framing modulation of mobile multimedia broadcasting signals
A technology for mobile multimedia and broadcasting signals, applied in multi-frequency code systems, shaping networks in transmitters/receivers, digital transmission systems, etc., can solve system performance deterioration, sub-channel orthogonality destruction, signal spectrum changes, etc. question
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[0031] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0032] According to an embodiment of a certain transmitter of the mobile multimedia broadcasting signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:
[0033] 1) The certain mobile multimedia broadcasting signal transmitter forms an FFT data block in the frequency domain after its input data bit stream undergoes symbol modulation and symbol rotation. FFT means fast discrete Fourier transform, and the length of the FFT data block is K The symbol modulation is one of QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellation mapping method of the symbol modulation adopts Gray code mapping; the symbol rotation is realized by rotating the symbol constellation at a certain angle, and the code of QPSK The rotation angle of the element constellation diagram is 22.5 degrees, the rotation angle of...
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