Multiplex communications – Communication over free space – Repeater
Patent
1997-03-04
2000-06-06
Kizou, Hassan
Multiplex communications
Communication over free space
Repeater
375279, 375283, 375330, H04L 2710, H04B 7216, H03D 322
Patent
active
060727853
ABSTRACT:
A method and a system for detecting a user signal in a CDMA network. (Coded) user message bits are grouped into successive groups. A differential phase is generated for each message bit group by mapping each message bit group on to a predetermined PSK constellation. An absolute phase is generated for each message bit group based on the differential phase for the current message bit group and the absolute phase for the preceding message bit group. The absolute phase signal is phase keyed to an RF carrier to form an RF signal. The RF signal is spread using two code sequences and the spread RF signal is transmitted. At the receiver, the RF signal is received and non-coherently demodulated. The demodulated RF signal is despread using the code sequences. Successive blocks of the demodulated, despread RF signal are phase compared for extracting the differential phase signal carrying the (coded) user message. Lastly, the user message is recovered.
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AT&T Corp
Kizou Hassan
Nguyen Hanh
LandOfFree
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