MEMORY REDUCTION IN DIGITAL VIDEO BROADCAST RECEIVERS

摘要

An input random access memory (RAM) module of a fast Fourier transform (FFT) engine of a DVB receiver is used to store, during a first time period, delayed versions of an input signal that includes a first orthogonal frequency divisional multiplexed (OFDM) symbol and a cyclic prefix therefor received at the receiver, and samples for a second OFDM symbol to be demodulated using the FFT engine during a second time period. Delayed versions of the input signal are stored in the input RAM module of the FFT engine in a first-in-first-out (FIFO) fashion for signal acquisition and for FFT processing. Similarly, an output RAM module of the FFT engine is used to store moving averages of an autocorrelation of the input signal with its cyclic prefix computed over presumed guard intervals and over multiple symbols.