Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2008-05-06
2008-05-06
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S349000
Reexamination Certificate
active
10736128
ABSTRACT:
A symbol synchronizer (100) is provided for a software-defined communications system (10). The symbol synchronizer (100), when integrated into either a pre- or post-detection diversity signal combiner (108, 208), enables highly accurate signal synchronization with minimal added system complexity. The symbol synchronizer (100) includes a single complex sliding window-matched filter (102) for filtering an input digital signal with a match filtering function based on predetermined signal transfer function characteristics to average out receiver noise from the signal. A signal delay bank (84) includes a plurality of delay blocks each for delaying the digital signal filtered by the single matched filter for a predetermined number of samples. A complex correlator (88) correlates the digital signal filtered by the single complex sliding window matched filter (102) and delayed by the complex correlator (88) with a correlator reference signal, and selects an index of a path having a peak correlator value. As a result of such a configuration, the symbol synchronizer (100) is capable of determining symbol boundaries of channel signals in a multi-channel communications system to enable system signal measurement statistics and demodulated to be more accurately generated.
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Bergstrom Chad S.
Chuprun Jeffery Scott
Gifford Carl Steven
Kleider John Eric
Fan Chieh M.
General Dynamics C4 Systems, Inc.
Jenner & Block LLP
Perilla Jason M.
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