Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-06-13
2006-06-13
Ghebretinsae, Temesghen (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C370S335000, C370S342000
Reexamination Certificate
active
07061967
ABSTRACT:
A method and apparatus for estimating channel tap delays of multipath components in a CDMA received signal. The search for the tap delays are split into two phases namely, a phase1and a phase2search. The phase1search is a coarse resolution quick search adapted to generate a rough estimate of the location of the tap delays. During this phase, the candidate codes are summed and the input signal correlated with the code sum creating an ambiguity in the code associated with the multipath. A finer resolution slower phase2search resolves the code ambiguity present in the initial rough estimates of the phase1search. Additional phase2correlations may be performed to implement a code-tracking loop.
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Avital Yaniv
Reshef Ehud
Schelm Jacob
Shabtay Ophir
Comsys Communication & Signal Processing Ltd.
Ghebretinsae Temesghen
Zaretsky Howard
Zaretsky & Associates PC
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