Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Reissue Patent
2008-01-01
2008-01-01
Vo, Don N. (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
C375S308000, C375S332000, C329S304000, C332S103000
Reissue Patent
active
RE039983
ABSTRACT:
A QPSK modulation scheme uses a data spreading mechanism to rob a relatively limited portion of available transmitter power, and inject into the QPSK waveform a prescribed amount of carrier signal power, through which detection and non-regenerative extraction of the carrier at the receiver may be achieved without incurring a signal-to-noise degradation penalty. In addition, the injected carrier-based modulation scheme of the invention may employ high performance forward error correction coding, to significantly reduce the signal power required for achieving a very low energy per bit-to-noise density ratio (Eb/N0)—on the order of one to zero dB.
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“Phase Shift Keying with a Transmitted Reference” by J.J. Bussgang and M. Leiter, IEEE Transactions on Communication Technology, vol. Com-14, No. 1, Feb., 1966 pp. 14-22.
Cobb Raymond F.
Luntz Michael B.
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Harris Corporation
Vo Don N.
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