Multimedia broadcast mobile signal framing modulation method
A technology for multimedia broadcasting and mobile signals. It is used in multi-frequency code systems, shaping networks in transmitters/receivers, and baseband system components. It can solve problems such as system performance deterioration, signal spectrum changes, and mutual interference.
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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 multimedia broadcasting mobile signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:
[0033] 1) The certain multimedia broadcast mobile signal transmitter forms an FFT data block in the frequency domain through symbol modulation and symbol rotation of its own input data bit stream, FFT represents 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. The symbol constellation mapping method of symbol modulation adopts Gray code mapping; the symbol rotation is realized by rotating the symbol constellation at a certain angle. The QPSK symbol The rotation angle of the constellation diagram is 22.5 degrees, the rotation angle of the symbol constel...
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