Header synchronization detector

摘要: A pattern detector adapted for wireless communication (Fig. 5) systems includes an error calculator, a comb filter, averager, and threshold detector. The to be detected is sequence of pilot signal patterns whose calculation relatively invariant with respect frequency offset introduced by Doppler the local oscillator. processes received input samples Yk determine from estimated A. are determined using channel impulse response. When vector 'aligned' expected header sync samples, level about equal noise. determines average signals last K each sample position EKn within pattern, where corresponds number in n position. also EL corresponding L sequence. lower than preselected percentage EL, deemed detected. Finally, end location minimum EKn. This found calculation, once detected, values that certain past minimum.