Telecommunications – Transmitter – Noise or interference elimination
Reexamination Certificate
2006-12-26
2006-12-26
Chan, Wing (Department: 2614)
Telecommunications
Transmitter
Noise or interference elimination
C455S001000, C455S073000, C455S078000, C455S083000, C455S084000, C455S141000, C455S283000, C455S296000
Reexamination Certificate
active
07155179
ABSTRACT:
A full-duplex transceiver using a method immunizing itself against self-jamming. The transceiver includes a receiver and a transmitter. The receiver includes a frequency immunization converter and a high pass IF filter. The transmitter transmits a TX signal. The receiver receives an RX signal and simultaneously receives a portion of the power of the TX signal as an undesired TX jamming signal. The frequency immunization converter uses the center frequency of the TX signal for downconverting the RX signal to an IF signal and simultaneously downconverting the TX jamming signal to near zero frequency. The high pass IF filter passes the IF signal and blocks the signal at near zero frequency. As a consequence of the downconversion using the TX frequency, a second LO frequency is controlled for avoiding image frequencies.
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Brady W. James
Chan Wing
Nguyen Quynh H.
Shaw Steven A.
Telecky , Jr. Frederick J.
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