INTEGER CARRIER FREQUENCY OFFSET ESTIMATION WITH LOW COMPUTATIONAL FOR AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING RECEIVER

摘要

A coarse integer carrier frequency offset CFO compensator (138) for an orthogonal frequency division multiplexor OFDM receiver. The coarse integer CFO compensator includes a subcarrier grouping engine (146), a signal power calculator (148), and a search range identifier (150). The subcarrier grouping engine groups a plurality of subcarriers into two groups based on a coarse acquisition range parameter, Q, corresponding to a coarse acquisition range. The signal power calculator identifies a coarse estimate of an integer CFO based on a computed maximum value of a signal power function. The signal power function is based on a constructed sequence of the plurality of subcarriers. The search range generator identifies a fine acquisition range. The fine acquisition range is narrower than the coarse acquisition range.