Anti-noise framing modulation method for multimedia broadcasting mobile signal
A multimedia broadcasting and mobile signal technology, applied in multi-frequency code system, shaping network in transmitter/receiver, digital transmission system, etc., can solve problems such as mutual interference, system performance deterioration, signal distortion, etc.
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[0033] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0034] According to the embodiment of a certain transmitter of the multimedia broadcasting mobile signal anti-noise framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:
[0035] 1) The anti-noise transmitter of a certain multimedia broadcasting mobile signal forms an FFT coded data block in the frequency domain after its input data bit stream undergoes LDPC coding, symbol modulation and symbol rotation, and the length of the FFT coded 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 symbol constellation diagram is 22.5 degrees, the rotation...
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