Full-duplex RF link for multi-channel wideband communication
First Claim
Patent Images
1. An RF communication system capable of simultaneous transmitting and receiving over multiple bands comprising:
- a. at least one transceiver capable of transmitting a wideband RF transmit signal and receiving a wideband RF receive signal;
b. a photonic interference canceller comprising;
i. a first electro-optical transmitter configured to modulate the wideband RF transmit signal to an optical transmit signal;
ii. a second electro-optical transmitter configured to modulate the wideband RF receive signal to an optical receive signal;
iii. a time delay circuit used to control the propagation time of a first copy of the optical transmit signal relative to the optical receive signal;
iv. a variable attenuator to control the relative power of the first copy of the optical transmit signal;
v. a first opto-electrical receiver configured to demodulate a second copy of the optical transmit signal to an RF signal;
vi. a second opto-electrical receiver configured to generate a filtered RF receive signal from which a transmit signal component has been canceled, wherein the second opto-electrical receiver is a balanced receiver receiving as inputs and demodulating (1) the first copy of the optical transmit signal, and (2) the optical receive signal, and combining the demodulated signals in order to generate the filtered RF receive signal; and
c. at least one wideband antenna directing the wideband RF receive signal to the transceiver and/or radiating the wideband RF transmit signal.
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Accused Products
Abstract
A method and apparatus for cancelling interference of an interfering transmit signal. The method includes the steps of (a) transmitting an RF transmit signal from a transceiver, (b) optically modulating the RF transmit signal, (c) optically modulating a RF receive signal; (d) demodulating an optical signal back to an RF signal using an optical-electrical balanced receiver and directing to the transceiver, and (e) demodulating the optical transmit signal back to RF transmit signal.
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Citations
18 Claims
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1. An RF communication system capable of simultaneous transmitting and receiving over multiple bands comprising:
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a. at least one transceiver capable of transmitting a wideband RF transmit signal and receiving a wideband RF receive signal; b. a photonic interference canceller comprising; i. a first electro-optical transmitter configured to modulate the wideband RF transmit signal to an optical transmit signal; ii. a second electro-optical transmitter configured to modulate the wideband RF receive signal to an optical receive signal; iii. a time delay circuit used to control the propagation time of a first copy of the optical transmit signal relative to the optical receive signal; iv. a variable attenuator to control the relative power of the first copy of the optical transmit signal; v. a first opto-electrical receiver configured to demodulate a second copy of the optical transmit signal to an RF signal; vi. a second opto-electrical receiver configured to generate a filtered RF receive signal from which a transmit signal component has been canceled, wherein the second opto-electrical receiver is a balanced receiver receiving as inputs and demodulating (1) the first copy of the optical transmit signal, and (2) the optical receive signal, and combining the demodulated signals in order to generate the filtered RF receive signal; and c. at least one wideband antenna directing the wideband RF receive signal to the transceiver and/or radiating the wideband RF transmit signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of cancelling the interference of an interfering transmit signal comprising the steps of:
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a. transmitting an RF transmit signal from a transceiver; b. splitting the RF transmit signal into a first and second copy; c. directing the second copy of the RF transmit signal to a first antenna; d. optically modulating the first copy of the RF transmit signal; e. optically modulating an RF receive signal routed from the first antenna or a second, co-site located antenna; f. delaying the optically modulated RF transmit signal relative to the optically modulated RF receive signal and attenuating the optically modulated RF transmit signal; g. demodulating the optical first copy of the RF transmit signal and the optical RF receive signal back to an RF signal using an optical-electrical balanced receiver; and h. combining the first copy of the RF transmit signal and RF receive signal in order to cancel interference from the RF transmit signal. - View Dependent Claims (11, 12, 13, 14)
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15. A method of cancelling the interference of an interfering transmit signal comprising the steps of:
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a. transmitting an RF transmit signal from a transceiver; b. splitting the RF transmit signal into a first and second copy; c. directing the second copy of the RF transmit signal to a first antenna; d. optically modulating the first copy of the RF transmit signal; e. optically modulating an RF receive signal routed from the first antenna or a co-site located second antenna; f. delaying the optically modulated RF transmit signal relative to the optically modulated RF receive signal and attenuating the optically modulated RF transmit signal; g. combining the optically modulated first copy of the transmit signal and the receive signal to a combined signal in order to cancel interference from the transmit signal; and h. demodulating the combined optical signal back to an RF signal and directing to the transceiver. - View Dependent Claims (16, 17, 18)
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Specification