Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2011-08-30
2011-08-30
Flores, Leon (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S142000, C375S143000, C375S152000, C375S316000, C375S340000, C375S343000, C375S368000, C370S509000, C370S510000
Reexamination Certificate
active
08009724
ABSTRACT:
Clear channel assessment (CCA) is a very important issue in Ultra-Wideband (UWB) systems. An effective CCA mechanism will have a large impact on the overall throughput of the communications system. It is disclosed methods and circuits to carry out CCA determinations exploiting the structure of the pulse signal either by using a moving average or by performing a cross-correlation with a locally generated signal.
REFERENCES:
patent: 7457295 (2008-11-01), Saunders et al.
patent: 7634034 (2009-12-01), Larsson
patent: 2004/0120424 (2004-06-01), Roberts
patent: 2004054280 (2004-06-01), None
Brendan C. Jones, David J. Skellern, Hiperlan System Performance Under DCA and FCA, 8th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Sep. 1-4, 1997, p. 1-5, Helsinki, Finland.
Razzell Charles
Zhang Yifeng
Flores Leon
NXP B.V.
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