Multiplex communications – Communication over free space – Repeater
Patent
1996-03-25
1997-12-09
Olms, Douglas W.
Multiplex communications
Communication over free space
Repeater
370342, 375206, H04B 7216
Patent
active
056967624
ABSTRACT:
A spread spectrum CDMA communication system in which a station transmits a short synchronization signal to allow a second station to (1) recognize that a signal is present, (2) resolve frequency uncertainty, (3) acquire the spreading code timing, (4) acquire frame and symbol synchronization, and (5) demodulate data which may contain user identification and other data. The rapid acquisition channel (RAC) includes a burst signal comprising of an Acquisition Field during which the carrier is biphase modulated with a pseudo-noise (PN) sequence, a Sync Field during which a synchronization sequence is mod-2 added to the PN sequence with one chip of the sync sequence equal to one or more periods of the PN sequence, and a data field with m-ary orthogonal code words mod-2 added to the PN sequence with one chip of the code word equal to one or more periods of the PN sequence.
REFERENCES:
patent: 5359625 (1994-10-01), Vander et al.
patent: 5383219 (1995-01-01), Wheafley, III et al.
patent: 5414728 (1995-05-01), Zehavi
patent: 5488629 (1996-01-01), Takahashi et al.
patent: 5511067 (1996-04-01), Miller
patent: 5577025 (1996-11-01), Skinner et al.
Natali Francis
Ohlson John
Bnimoussa A.
Olms Douglas W.
Stanford Telecommunications, Inc.
Zegeer, Esq. Jim
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