Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2004-06-29
2009-06-09
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S230000, C375S233000, C375S229000, C375S316000, C381S103000, C381S071100, C381S071800, C381S071110, C333S018000, C333S02800T, C708S323000
Reexamination Certificate
active
07545859
ABSTRACT:
An adaptive channel equalization technique and method for wideband passive receivers is disclosed that reduces and tends to minimize distortions caused by circuitry within passive digital receivers. This equalization architecture provides an adaptive equalization solution for a wideband passive channel that receives unknown signals from the RF environment both temporally and spectrally. A wideband chirp signal or calibration signal is periodically injected to capture the spectral response of the receiver channel as it varies from the distortions induced over time and temperature for synthesis of equalization filter coefficients. Thus, the channel equalization is performed independent of receiver signal source and is employed to minimize digital receiver signal measurement distortions across the passband by providing an equalization filter whose magnitude and phase response compensates for the channel distortions of the passive data collection system.
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L-3 Communications Integrated Systems L.P.
Liu Shuwang
O'Keefe, Egan Peterman & Enders LLP
Tayong Helene
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