Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2007-12-25
2007-12-25
Kim, Kevin (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
C375S357000
Reexamination Certificate
active
10462853
ABSTRACT:
Half duplex, Frequency Hopped-Spread Spectrum wireless transceivers (102), operating without a central controller, maintain time synchronization with the frequency hopping sequence for a period after transmission of a half duplex signal ceases. The wireless transceiver (102) operates their receivers (308) according to the RF frequency hopping sequence and schedule (200). The wireless transceiver (102) is then able to send a short transmission request to signal that it will start transmitting on the Frequency Hopping schedule (200) of the previously ceased transmission. A wireless transceiver (102) that was either the original transmitter or the original receiver is able to transmit this transmission request. A subset of time slots within the hopping schedule (200) can be optionally assigned to the original transmitter and original receiver to obviate collisions of the transmit request transmissions from both device at the same time.
REFERENCES:
patent: 6321095 (2001-11-01), Gavette
patent: 6366572 (2002-04-01), Esterberg et al.
patent: 6625209 (2003-09-01), Najafi
patent: 6639905 (2003-10-01), Muller et al.
Khawand Charbel
Liu Bin
Miller Jianping W.
Kim Kevin
Motorola Inc.
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