Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Reexamination Certificate
2006-09-12
2006-09-12
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
C375S330000
Reexamination Certificate
active
07106804
ABSTRACT:
A system for and method of modulating and demodulating a communication signal using differential quadrature phase shift keying (DQPSK) can include, upon receiving an inbound communication signal, demodulating the inbound communication signal by obtaining Pi/4 differential quadrature phase shift keying (DQPSK) symbols, translating the Pi/4 DQPSK symbols into quadrature phase shift keying (QPSK) symbols, and mapping the QPSK symbols to a pair of bits. Upon initiating an outbound communication signal, the system and method can include modulating the outbound communication signal by obtaining communication bits indicative of the outbound communication signal, translating the communication bits to three communication bits, and mapping the translated bits to DQPSK symbols.
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Cameron Kelly Coursey, “Layer 1: The Digital PCS Physical Layer,” Understanding Digital PCS The TDMA Standard, Artech House, Norwood, MA, 1999, pp. 50-55.
“Digital Modulation and Mobile Radio” Refresher topic from Rohde & Schwarz http://www.rsd.de pp. 1-19 printed Dec. 21, 2005.
Ghebretinsae Temesghen
Siemens Communications Inc.
Torres Juan Alberto
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