Pulse or digital communications – Receivers – Amplitude modulation
Reexamination Certificate
2008-07-02
2009-11-17
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Receivers
Amplitude modulation
Reexamination Certificate
active
07620123
ABSTRACT:
An improved receiver and method estimate one or more parameters, such as amplitude and signal-to-noise ratio, of a received signal, such as an M-QAM or q-ASK signal. The amplitude of an M-QAM signal is estimated based upon known or ascertainable phase information regarding a plurality of transmitted symbols. The amplitude of a q-ASK signal is estimated based upon known or ascertainable magnitude information regarding a plurality of transmitted symbols. In another embodiment, the amplitude of an M-QAM or q-ASK signal is estimated based on statistical knowledge of the amplitude of the transmitted symbols. Other embodiments estimate amplitude, noise power, and signal-to-noise ratio of a received signal utilizing second-order and fourth-order moments of received samples, a maximum likelihood searching process, or a Kurtosis estimation process.
REFERENCES:
patent: 4775988 (1988-10-01), Chevillat
patent: 5867478 (1999-02-01), Baum et al.
patent: 6044111 (2000-03-01), Meyer et al.
patent: 6704353 (2004-03-01), McCarty et al.
patent: 7154966 (2006-12-01), Malm et al.
patent: 2002/0150187 (2002-10-01), Chugg et al.
patent: 2004/0096007 (2004-05-01), Aue et al.
patent: 2004/0264589 (2004-12-01), Kenney et al.
patent: 2004/0264590 (2004-12-01), Kenney et al.
patent: 0 211 995 (1987-03-01), None
patent: 06-224953 (1994-08-01), None
patent: 07-38615 (1995-02-01), None
patent: 2003-338851 (2003-11-01), None
patent: 00/64061 (2000-10-01), None
Tarokh, Beeta et al. “Construction of OFDMM-QAM Sequences With Low Peak-to-Average Power Ratio”, Jan. 2003, IEEE Transactions on Communications, vol. 51, No. 1, pp. 25-28.
Tang, Xiaoyi et al. “Effect of Channel Estimation Error on M-QAM BER Performance in Rayleigh Fading”, Dec. 1999, IEEE Transactions on Communications, vol. 47, No. 12, pp. 1856-1854.
Kalet, Irving et al. “QAM Transmission Through a Companding Channel —Signal Constellations and Detection”, Apr. 1994, IEEE Transactions of Communications, vol. 42, No. 2/3/4, pp. 417-429.
Zook, David M. et al. “Adaptive Wireless Communication Signaling Algorithms For Differential Amplitude Phase Shift Keying In Fading Channels”, 2001, IEEE, pp. 118-122.
Li Bin
Pietraski Philip J.
Sternberg Gregory S.
Ahn Sam K
InterDigital Technology Corporation
Volpe and Koenig P.C.
LandOfFree
Receiver for estimating signal magnitude, noise power, and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Receiver for estimating signal magnitude, noise power, and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Receiver for estimating signal magnitude, noise power, and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4060455