| 摘要 |
A receiver and associated method for receiving an OFDM signal. The signal comprises a series of OFDM symbols, each symbol comprising a plurality of sub-carriers, each sub-carrier being modulated by one or more data bits encoded with an error-correcting code. The receiver comprises: a first error-correcting decoder (250), adapted to decode sequentially the data bits of a received first OFDM symbol; a re-encoder (255), arranged to receive decoded bits from the first decoder and adapted to re-encode a leading portion of the decoded bits; a mapper (225), arranged to receive the re-encoded leading portion of bits from the re-encoder, map these bits to a corresponding subset of the plurality of sub-carriers, and thereby estimate a modulation symbol that was applied to each sub-carrier of said subset, by the transmitter; a channel estimator (260), adapted to produce a channel estimate by comparing the sub-carrier modulation symbols estimated by the mapper with the corresponding sub-carriers actually received by the receiver; and an equalizer (215), adapted to process the received signal to remove distortions introduced by the transmission channel, using the channel estimate, wherein the re-encoder (255) is adapted to begin re-encoding the leading portion of the bits before a trailing portion of the bits has been decoded by the decoder (250). |
