Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2008-07-22
2008-07-22
Tran, Khai (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S130000
Reexamination Certificate
active
10899846
ABSTRACT:
Provided are improved systems and methods for spread spectrum communication employing hybrid Eb/No and pilot-based finger lock determination for RAKE receivers. Finger lock thresholds are periodically set using an extended time-averaged Eb/No traffic signal estimate for each finger mapped to an Ec/No pilot level, where the extended time-averaged Eb/No estimate is inversely proportional to the mapped Ec/No level, thus, decreasing the required Ec/No level when the Eb/No estimate increases and increasing the required Ec/No level when the Eb/No estimate decreases. Existing pilot-based finger lock algorithms may be used with the Ec/No threshold set using the extended time-averaged Eb/No estimate. When pilot signals are weak but traffic signals remain strong, fingers will remain locked to increase the combiner output signal-to-noise ratio.
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Liu Fenghua
Pan Li
Shah Jigneshkumar
Alston & Bird LLP
Nokia Corporation
Tran Khai
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