A multicarrier receiver using a weighted sum of pilot powers to detect mistuning

摘要

A receiver is tuned into a multicarrier signal first by performing fine tuning control, preferably in the time domain, and then determining a coarse frequency offset to adjust the receiver to the correct frequency with respect to the transmitted signal. The coarse frequency offset is determined by summing the powers of a predetermined set of subcarriers associated with one frequency offset, repeating this for other frequency offsets, and determining whether the largest sum has a predetermined relationship to the other sums. Discrimination is improved by disregarding the largest of the powers when determining the sum. Preferably, the sums are integrated over multiple symbol periods, and the speed of locking-in is increased by terminating the operation when the predetermined relationship has been reached.