United States Patent 7,620,123
Li , et al. November 17, 2009
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Receiver for estimating signal magnitude, noise power, and signal-to-noise ratio of received signals
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.
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Inventors: Li; Bin (Shenzhen, CN), Sternberg; Gregory S. (Mt. Laurel, NJ), Pietraski; Philip J. (Huntington Station, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 12/166,702
Filed: July 2, 2008
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
10750203 Dec., 2003 7502426
60501302 Sep., 2003
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Current U.S. Class: 375/320
Current International Class: H03D 1/24 (20060101)
Field of Search: 375/261,298,316,320 332/103,120,149,150 370/207 329/304,347,348,349
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