Excavating
Patent
1995-03-08
1998-03-17
Elmore, Reba I.
Excavating
375232, 375341, 375346, G06F 1110
Patent
active
057295581
ABSTRACT:
Briefly, in accordance with one embodiment of the invention, a method of compensating for Doppler error in a wireless communications system employing Viterbi decoding comprises the steps of: for each signal sample in a first predetermined-sized grouping of received signal samples, performing a parallel Viterbi update and short symbol decode; and for a second predetermined-sized grouping, forming by pipeline processing an estimate of the Doppler error in accordance with the parallel short traceback decoding performed for the first grouping, and adjusting each signal sample in the second grouping in accordance with the estimated Doppler error.
Briefly, in accordance with another embodiment of the invention, a Viterbi traceback reconstructed signal sample index comprises: a state counter, a traceback shift register (TBSR); a signal reconstruction table; and a comparator coupled in a configuration so as to provide the sign bit to the TBSR from a comparison of binary digital signals. The state counter is coupled so as to provide digital signals to the TBSR and the TBSR is coupled so as to provide digital signals to the signal reconstruction table.
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Brown Thomas E.
Elmore Reba I.
Lucent Technologies - Inc.
Skaist Howard
Veschi John P.
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