SINGLE CHANNEL FULL DUPLEX WIRELESS COMMUNICATION
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Abstract
A single channel full duplex wireless communication system includes a processor, a transmitter, a receiver, a secondary transmission path, a combining element, a primary transmission feedback path and a secondary transmission feedback path. The transmitter transmits a transmission signal via a transmission path. The receiver receives a received signal via a reception path. The transmitter and the receiver utilize one channel to transmit and receive signals. The transmission signal causes self-interference. The processor estimates a first transfer function and feeds the secondary transmission path with the transmission signal adjusted by the first transfer function to reduce the transmission signal leaked to the reception path. The combining element combines the transmission signal with the adjusted secondary transmission path signal to remove the self-interference. The primary transmission feedback path output is modified by a second transfer function. The secondary transmission feedback path output is modified by a third transfer function.
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Citations
46 Claims
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1-30. -30. (canceled)
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31. A single channel full duplex wireless communication system, comprising:
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a processor; a transmitter connected to the processor, the transmitter transmitting a transmission signal via a transmission path; a receiver connected to the processor, the receiver receiving a received signal via a reception path, wherein the transmitter and the receiver utilize one channel, at the same time, to transmit and receive said transmission and received signals, wherein a portion of the transmission signal is leaked, said leakage causing self-interference in the received signal; a secondary transmission path connected to the processor; the processor estimating a first transfer function, wherein the input to the first transfer function is adjusted by the first transfer function so as to produce an output to reduce the self-interference in the received signal, and feeding the input of the secondary transmission path with the output from the first transfer function; and a combining element to combine the received signal with the output from the secondary transmission path, thereby removing at least a fraction of the self-interference. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A method of improving signal-to-interference ratio in a single channel full duplex wireless communication system, comprising:
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transmitting, by a transmitter, a transmission signal via a transmission path; receiving, by a receiver, a received signal via a reception path, the transmission path and the reception path utilizing one channel, at the same time, to transmit and receive the transmission and received signals, wherein a portion of the transmission signal is leaked, said leakage causing self-interference in the received signal; estimating, by a processor, a first transfer function, wherein the input to the first transfer function is adjusted by the first transfer function so as to produce an output to remove at least a fraction of the self-interference in the received signal; feeding, by the processor, the input of a secondary transmission path with the output from the first transfer function, the secondary transmission path being connected to the processor; and combining, by a combining element, the received signal with the output from the secondary transmission path, thereby removing at least a fraction of the self-interference. - View Dependent Claims (38, 39, 40)
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41. A single channel full duplex wireless communication system, comprising:
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a processor; a transmitter connected to the processor, the transmitter transmitting a transmission signal via a transmission path;
wherein a portion of the transmission signal is leaked;a receiver connected to the processor, the receiver receiving a received signal, the received signal including the leakage from the transmission signal, the receiver including at least one combining element and at least one reception path, wherein the at least one combining element is connected to an input of the receiver and wherein the at least one reception path is connected to an output of the receiver, wherein the receiver produces an output signal, the output signal including self-interference caused by the leakage from the transmission signal; a secondary transmission path connected to the processor and to the combining element; and the processor estimating a first transfer function, wherein the first transfer function has an input comprising the transmission signal fed to the input of the transmission path, and wherein the output of the first transfer function is fed to an input of the secondary transmission path to produce a first intermediate signal at an output of the secondary transmission path, wherein a first cancellation signal is obtained based upon the first intermediate signal, the first cancellation signal being subsequently combined with the received signal in the at least one combining element so as to reduce the self-interference in the output signal from the receiver; and a second cancellation signal being generated by modifying a second intermediate signal using a second transfer function, the second transfer function being estimated by the processor, the second intermediate signal being obtained based on at least one of the transmission signal and the first intermediate signal, the second cancellation signal being subsequently combined with the output signal from the receiver within the processor, thereby further reducing the self-interference in the output signal from the receiver. - View Dependent Claims (42, 43, 44, 45, 46)
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Specification