Detection and identification of known sequences such as sequences composed
of Walsh-Hadamard sequence and scrambling sequence are provided in a fast fading
and frequency offset environment using a segmented correlator and FHT (Fast Hadamard
Transform) architecture with frequency offset compensation. The incoming sequence
of samples or data is segmented into blocks. Each block is individually detected
using a correlator/FHT segment. Each sequence identifying output of each correlator/FHT
segment is multiplied by a sinusoid for frequency offset compensation. The frequency
offset compensated output from each correlator/FHT segment is summed with the corresponding
frequency offset compensated output of other correlator/FHT segments. Each sum
is compared with a threshold to determine whether a particular sequence has been
detected and identified.
