A DUPLEX UNIT
First Claim
1. A duplex unit for the simultaneous transmission and reception of microwave signals, the duplex unit comprising:
- an interference canceller unit; and
a control unit;
wherein the interference canceller unit comprises;
a duplex coupler with an antenna port, an input port, a first and a second output port and a return port; and
a first adaptive filter;
wherein the duplex coupler being is arranged to;
receive a transmit signal at the input port and output a first part of the transmit signal at the antenna port, and suppress leakage of the transmit signal to the first output port; and
output a second part of the transmit signal at the second output port to be received by the first adaptive filter;
wherein the first adaptive filter is arranged to output a first filtered signal to the return port;
wherein the duplex coupler is further arranged to receive a receive signal comprising a payload signal at the antenna port, and to output a combination of the receive signal and the first filtered signal as an interference suppressed receive signal on the first output port; and
wherein the control unit is arranged to use the interference suppressed receive signal to adapt the first adaptive filter by a first control signal to make the interference suppressed receive signal equal to the payload signal.
1 Assignment
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Accused Products
Abstract
A duplex unit allowing simultaneous transmission and reception of microwave signals on at least partly overlapping frequency bands, comprising an interference canceller unit and a control unit, the duplex unit being arranged to receive a transmit signal and to output a first part of the transmit signal at an antenna port, the duplex unit further being arranged to receive a receive signal comprising a payload signal at the antenna port, and to output a combination of the receive signal and a filtered transmit signal as an interference suppressed receive signal of the duplex unit.
35 Citations
16 Claims
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1. A duplex unit for the simultaneous transmission and reception of microwave signals, the duplex unit comprising:
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an interference canceller unit; and a control unit; wherein the interference canceller unit comprises; a duplex coupler with an antenna port, an input port, a first and a second output port and a return port; and a first adaptive filter; wherein the duplex coupler being is arranged to; receive a transmit signal at the input port and output a first part of the transmit signal at the antenna port, and suppress leakage of the transmit signal to the first output port; and output a second part of the transmit signal at the second output port to be received by the first adaptive filter; wherein the first adaptive filter is arranged to output a first filtered signal to the return port; wherein the duplex coupler is further arranged to receive a receive signal comprising a payload signal at the antenna port, and to output a combination of the receive signal and the first filtered signal as an interference suppressed receive signal on the first output port; and wherein the control unit is arranged to use the interference suppressed receive signal to adapt the first adaptive filter by a first control signal to make the interference suppressed receive signal equal to the payload signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A microwave transceiver for the simultaneous transmission and reception of microwave signals on at least partly overlapping frequency bands, the microwave transceiver comprising:
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a modem unit; and duplex unit comprising an interference canceller unit and a control unit; wherein the modem unit is arranged to generate a basic transmit signal and to receive a processed receive signal; wherein the control unit of the duplex unit is arranged to generate a control signal based on a second control signal generated by the modem unit, wherein the microwave transceiver further comprises a second adaptive filter and a transmit component; wherein the transmit component is arranged to receive the basic transmit signal from the modem and to generate a transmit component output signal arranged to be divided into the transmit signal of the duplex unit and into an input signal of the second adaptive filter; wherein the microwave transceiver is further arranged to delay the interference suppressed receive signal of the duplex unit by a pre-determined amount set in relation to the delay of the second adaptive filter, and to also obtain as the processed receive signal a combination of the delayed interference suppressed receive signal and a second filtered signal from the second adaptive filter; wherein the modem unit is further arranged to adapt the second adaptive filter by a second control signal, and to generate the second control signal to make the processed receive signal equal to the payload signal. - View Dependent Claims (11, 12, 13)
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14. A method for the simultaneous transmission and reception of microwave signals on at least partly overlapping frequency bands, the method comprising:
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receiving, in a duplex coupler, a microwave transmit signal; transmitting, from said duplex coupler, a first part of the microwave transmit signal via an antenna; filtering, by a first adaptive filter, a second part of the microwave transmit signal in order to generate a first filtered signal; receiving a receive signal comprising a payload signal via the antenna; determining a combination of the first filtered signal and the composite signal to obtain an interference suppressed receive signal; using the interference suppressed receive signal as a received microwave signal; and adapting the first adaptive filter by the received microwave signal in order to make the interference suppressed receive signal equal to the payload signal. - View Dependent Claims (15, 16)
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Specification