Patent ID: 8073064

Claim:
A method for identifying a trigger point of at least one orthogonal frequency division multiplexing (OFDM) decoder, wherein said OFDM decoder comprises a first moving average filter and a second moving average filter, said method comprising: correlating a first time-domain sample of said at least one OFDM symbol with a second time-domain sample of said at least one OFDM symbol, wherein said first time-domain sample corresponds to a first time instance and said second time-domain sample corresponds to a second time instance, wherein said second time instance precedes said first time instance; processing said first time-domain sample and said second time-domain sample in said first moving average filter to determine a channel impulse response; comparing at least one correlation value of a first biggest path in said channel impulse response and a second biggest path in said channel impulse response; determining a channel length of said channel impulse response based on a time duration of said channel impulse response; determining if a channel corresponding to said at least one OFDM symbol is at least one of a post-cursor channel or a pre-cursor channel based on a time of occurrence of said first biggest path and said second biggest path in said channel impulse response; determining if a channel corresponding to said at least one OFDM symbol is an aliased channel; identifying at least one of a first trigger point and a second trigger point, wherein said first trigger point corresponds to said post-cursor channel and said second trigger point corresponds to said pre-cursor channel, wherein said first trigger point corresponds to a beginning of a guard interval of said at least one OFDM symbol in said first biggest path, and wherein said second trigger point corresponds to a beginning of an effective portion of said at least one OFDM symbol in said first biggest path; and selecting said trigger point from at least one of said first trigger point and said second trigger point, if said channel length is more than a threshold value, wherein said threshold value is greater than T g , wherein said T g is equal to a length of a guard interval in said at least one OFDM symbol.