Hardware-efficient frequency de-interleaving

摘要

In an OFDM receiver an input section (INS) reconfigurates an OFDM transmission signal (RF)into a digital signal (IQ). A demodulator input buffer (DIB) transforms the digital signal (IQ) from the input section (INS) into a bursty signal (ID) which is supplied to a fast Fourier transform type of demodulator (DEM). In response thereto the demodulator (DEM) provides a bursty output signal (DB). Each burst MB(.) therein comprises demodulation samples (me(.)) which relate to the carriers (F(1)..F(N)) in the OFDM transmission signal (RF). During a burst MB(.) demodulation samples (me(.)) are written into a demodulator output buffer (DOB). Before the next burst MB(.) the demodulation samples (me(.)) are read in a sequence which is different from the sequence in the burst MB(.). This, inter alia, to effectuate frequency de-interleaving.