Patent ID: 7826544

Claim:
A method comprising receiving an OFDM signal; determining a fractional frequency offset of the OFDM signal, wherein the determining includes performing a time domain cyclic prefix auto correlation (TDCPAC) of symbols within a frame of the OFDM signal; selecting a frequency domain associated with the fractional frequency offset; determining a coarse location for a preamble of the OFDM signal, wherein the determining includes performing a frequency domain differential correlation (FDDC) on possible preambles; determining downlink portion of a frame of the OFDM signal based on the course location of the preamble; aligning a frame start with the course location of the preamble; determining a symbol boundary, wherein the determining includes performing a TDCPAC of symbols within the downlink portion of a frame of the OFDM signal; aligning a frame start with the symbol boundary; determining preamble location, wherein the determining includes performing a FDDC on possible preambles within the course location of the preamble; aligning a frame start with the preamble location; and determining preamble sequence and integer frequency offset.