Patent ID: 9071492
Filing Date: 2015-06-30
Classification: H04L

Abstract:
1. A receiver for an OFDM signal including a series of OFDM symbols, each symbol having a plurality of sub-carriers, each sub-carrier being modulated by at least one data bit encoded with an error-correcting code, the receiver comprising: a first error-correcting decoder, adapted to decode sequentially the data bits of a received first OFDM symbol; a re-encoder, arranged to receive decoded bits from the first decoder and adapted to re-encode a leading portion of the decoded bits; a mapper, 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, 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, adapted to process the received signal to remove distortions introduced by the transmission channel, using the channel estimate, wherein the re-encoder 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; and wherein the leading portion of bits decoded from the first OFDM symbol is combined with a trailing portion of bits decoded from a preceding OFDM symbol; and the channel estimator is adapted to produce a channel estimate based on the combined portions.