Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2005-06-14
2005-06-14
Tse, Young T. (Department: 2637)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S150000
Reexamination Certificate
active
06907091
ABSTRACT:
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.
REFERENCES:
patent: 5426665 (1995-06-01), Cleverly et al.
patent: 6233271 (2001-05-01), Jones et al.
patent: 6654432 (2003-11-01), O'Shea et al.
Chang Edith
Gurey Stephen M.
Lucent Technologies - Inc.
Malvone Christopher N.
Tse Young T.
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