Patent ID: 8300719

Claim:
An apparatus for detecting a plurality of digital video signal parameters used in an Orthogonal Frequency-Division Multiplexing (OFDM) communication system, the apparatus receiving a first Orthogonal Frequency Division Multiplexing (OFDM) symbol and a second OFDM symbol to detect an integer carrier frequency offset (ICFO), a pilot pattern and a carrier mode of a received signal, the first OFDM symbol comprising a plurality of first frequency-domain sub-carriers, the second OFDM symbol comprising a plurality of second frequency-domain sub-carriers, the apparatus comprising: a correlation apparatus that generates a plurality of sub-carrier correlation results according to a plurality of predetermined ICFOs, a predetermined pilot pattern, a predetermined carrier mode, and a plurality of correlation values generated from correlating the first frequency-domain sub-carriers and the second frequency-domain sub-carriers, the correlation apparatus comprising: a correlator that complex-conjugate multiplies the plurality of first frequency-domain sub-carriers by the plurality of second frequency-domain sub-carriers to generate the plurality of correlation values; a storage unit, coupled to the correlator, that stores the plurality of correlation values; an address generating unit, coupled to the storage unit, that generates a plurality of sub-carrier addresses according to the plurality of predetermined ICFOs, the predetermined pilot pattern, and the predetermined carrier mode; and an adding unit, coupled to the storage unit, that generates the sub-carrier correlation results from the absolute value of a summation of the plurality of correlation values corresponding to the plurality of sub-carrier addresses; a maximum value searching unit, coupled to the correlation apparatus, that determines a maximum sub-carrier correlation result from the plurality of sub-carrier correlation results; and a parameter generator, coupled to the maximum value searching unit, that generates the ICFOs, the pilot pattern and the carrier mode in response to the maximum sub-carrier correlation result.