Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-12-05
2006-12-05
Phu, Phuong (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S227000, C375S283000, C455S226300, C455S296000
Reexamination Certificate
active
07145966
ABSTRACT:
A received continuous phase modulation (CPM) signal (which is formed with a set of pulse shaping functions) is approximated as a phase shift keying (PSK) modulated signal (which is formed with just the dominant pulse shaping function having the largest energy). Channel estimation and data detection are performed in accordance with the CPM-to-PSK approximation. A signal power estimate and a noise power estimate are obtained for the received CPM signal and have errors due to the CPM-to-PSK approximation. The difference Δ between the energy of the dominant pulse shaping function and the energy of the remaining pulse shaping functions is determined. An approximation error is estimated based on the signal power estimate and the difference Δ. A C/I estimate for the received CPM signal is computed based on the signal power estimate, the noise power estimate, and the approximation error estimate.
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Chaudhuri Arunava
Lai Kuei-Chiang
Brown Charles D.
Chen Alex C.
Phu Phuong
Qualcomm Incorporated
Wadsworth Philip R.
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