Interference canceling receiver
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United States of America Patent
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Mar 17, 1998
Grant Date -
N/A
app pub date -
Apr 30, 1996
filing date -
Dec 16, 1994
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Abstract
A receiver used in a system having a transmitter (10) that sends an exciting signal to a remote transponder (18) is configured to receive a relatively weak signal from the transponder and to cancel out relatively high level interference from the transmission itself. A received frequency shift keying signal is fed to a tuned amplifier (22) for preliminary analog signal conditioning, and thence fed to an analog to digital converter (24). The output of the analog to digital converter is integrated (26) over a selected number of clock pulses and then dumped into a quarter rate quadrature demodulator (60) that multiplies the integrated signal by the same signal delayed by one clock interval. Undesired artifacts generated in the demodulator (60) are removed by a cascade of comb filters (70), and the demodulated digital output is available as the desired output of the receiver. The several clock signals of the system are all referenced from a basic exciter signal that itself gives rise to the transmitted interference signal so that the interference and all timing signals are approximately synchronous.
First Claim
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- 15 United States
- 10 France
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- 7 China
- 5 Korea
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Patent Owner(s)
- HUGHES ELECTRONICS CORPORATION;MICROELECTRONICS TECHNOLOGY, INC.;TELASIC COMMUNICATIONS
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- [Patents Count]
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Burns, John M | Harbor City, CA | 15 | 75 |
Stone, Wade J | New York, NY | 7 | 299 |
Tso, Robert | South San Gabrial, CA | 40 | 545 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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