Patent ID: 7903750

Claim:
A system for identifying transmission parameters of an OFDM signal transmitted in accordance with a transmitter clock, the system comprising: a first correlator to receive and correlate samples of the OFDM signal sampled in accordance with a receiver clock and to provide a first metric indicative of whether the OFDM signal has a first transmission mode of a plurality of permissible transmission modes for the OFDM signal; a plurality of additional correlators, operable in parallel with the first correlator, to receive and correlate the samples of the OFDM signal sampled in accordance with the receiver clock and to provide a plurality of additional metrics indicative of whether the OFDM signal has a second transmission mode of the plurality of permissible transmission modes for the OFDM signal, the plurality of additional correlators including a first additional correlator to provide a first additional metric indicative of whether the OFDM signal has the second transmission mode and the receiver clock is aligned with the transmitter clock, and at least one second additional correlator to provide at least one second additional metric indicative of whether the OFDM signal has the second transmission mode and the receiver clock is displaced by at least one sample over one OFDM symbol relative to the transmitter clock; and a processor configured to receive the first metric and the plurality of additional metrics, and based upon the first metric and the plurality of additional metrics, to determine whether the OFDM signal has one of the first transmission mode or the second transmission mode, and when the OFDM signal has the second transmission mode, to additionally determine whether the receiver clock is the one of aligned with the transmitter clock or displaced by the at least one sample over one OFDM symbol relative to the transmitter clock.