OFDM-based electricity-saving method for mobile digital multimedia broadcasting receiver
A technology of multimedia broadcasting and mobile digital, applied in the field of mobile communication, can solve the problem of lowering the power consumption of the receiver, and achieve the effect of reducing power consumption
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[0021] Receiver structure based on OFDM technology such as figure 1 As shown, the radio frequency signal is converted into a zero-IF or low-IF signal through the tuner, and then converted into a digital signal after being sampled by the ADC, and then decoded before FFT (Fast Fourier Transform), and then converted into a frequency domain signal after FFT, and then decoded after FFT . Decoding before the FFT is basically a data stream that flows straight through (without buffering), so the latency is low and constant. When the pre-FFT decoding module sends the data to the FFT module, a symbol head flag will be generated at the starting position of the OFDM symbol (remove the guard interval), telling the FFT module that this is the starting position of the OFDM symbol. The FFT module performs FFT processing on the entire OFDM symbol, and transforms the signal into the frequency domain. After the FFT, the decoding module generally needs to perform deinterleaving and then process...
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