Single-frequency-network robust wireless multimedia broadcast signal framing and modulating method
A technology of multimedia broadcasting and framing modulation, applied in multi-frequency code system, shaping network in transmitter/receiver, digital transmission system, etc., can solve problems such as system performance deterioration, signal spectrum change, mutual interference, etc.
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[0032] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0033] According to the embodiment of the single frequency network transmitter of the single frequency network robust wireless multimedia broadcasting signal framing modulation method proposed by the present invention, as figure 1 shown, follow these steps:
[0034] 1) The network data manager of the single frequency network forms an FFT concatenated interleaved coded modulation data block in the frequency domain after the input data bit stream undergoes BCH coding, bit interleaving, LDPC coding, symbol modulation, and symbol interleaving. FFT means fast Discrete Fourier transform, FFT cascaded interleaving encoding, the length of the modulation data block is K; the encoding rate of LDPC encoding is one of 1 / 4, 1 / 2, 5 / 8, 3 / 4 and 7 / 8; the bit interleaving adopts random Interleaving method; symbol modulation is one of QPSK, 16QAM, 32QAM, 64QAM,...
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