Communications – electrical: acoustic wave systems and devices – Receiver circuitry
Patent
1998-10-08
2000-09-19
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
H04B 106
Patent
active
061222240
ABSTRACT:
A receiver and method are disclosed that improves signal detection in a mipath environment wherein the desired reflected acoustic pulse is degraded by multipath reflections and embedded in noise. The invention provides a receiver that repetitively processes the received signal. The receiver includes separate signal processors, such as parallel configured quadrature signal processors, wherein each processor operates over different, and preferably contiguous, time intervals. After each repetition, the processing time interval for each processor is changed. The outputs of the processors are combined, such as by summing, and applied to a detector, such as a threshold detector, for each processing repetition to determine if the transmitted pulse is detected. The receiver continues processing the received signal until a predetermined number of time intervals have been processed without detection of a pulse or until the reflected pulse is detected. The processing can be accomplished in real time because the repetition rate of processing is much faster than the rate at which pulses are transmitted and received.
REFERENCES:
patent: 5420827 (1995-05-01), Feintuch
patent: 5646958 (1997-07-01), Tsujimoto
Gauthier Robert W.
Lall Prithvi C.
McGowan Michael J.
Pihulic Daniel T.
The United States of America as represented by the Secretary of
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