Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Reexamination Certificate
2007-11-06
2007-11-06
Tran, Khai (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
C375S329000
Reexamination Certificate
active
10898380
ABSTRACT:
In the apparatus and the associated method, N-ary phase shift keyed received signals R12are temporally demultiplexed in a 1:M demultiplexer DEMUX. In each of the sub-units DU1. . . DUM the carrier signal C12of the received signal R12is recovered. The carrier phase angle angC12is always chosen in the range −π/N . . . π/N. Occurring phase jumps PHJ of the carrier phase angle angC12from one sub-unit DU(i−1) to the next, DUi, of size ±2π/N are detected and are taken into account in a differential decoding of the synchronously demoudlated received signals R12. For this purpose, signals of the same or other sub-units must be temporarily stored in the sub-unit DUi until they are needed. In this way one obtains a high tolerance with respect to phase noise of the received signal R12.
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Greenberg Laurence A.
Locher Ralph E.
Stemer Werner H.
Tran Khai
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