SINGLE CHANNEL FULL DUPLEX WIRELESS COMMUNICATION
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Accused Products
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.
8 Citations
60 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 coupled to the processor, the transmitter transmitting a transmission signal via a transmission path;
wherein a portion of the transmission signal is leaked;a receiver coupled 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 transmitter and the receiver utilize one channel, at the same time, to transmit and receive said transmission and received signals with no separation between frequencies used for the transmitting and the receiving, wherein the at least one combining element is coupled to an input of the receiver and wherein the at least one reception path is coupled 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 coupled to the processor and to the at least one 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, and wherein a first cancellation signal is generated 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. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method of reducing self-interference in a single channel full duplex wireless communication apparatus, comprising the steps of:
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transmitting, by a transmitter, a transmission signal via a transmission path, said transmission signal fed to an input of the transmission path; receiving a received signal by a receiver including at least one combining element and at least one reception path, wherein the at least one combining element is coupled to an input of the receiver and the at least one reception path is coupled to an output of the receiver, the transmission path and the reception path utilizing one channel, at the same time, to transmit and receive the transmission and received signals, with no separation between frequencies used for the transmitting and the receiving, and wherein a portion of the transmission signal is leaked, said leakage causing self-interference in the output signal from the receiver; estimating, by a processor, a first transfer function, wherein the first transfer function has an input comprising at least a portion of the transmission signal fed to the input of the transmission path, and an output comprising the input adjusted by the first transfer function in such a way so as to reduce the self-interference in the received signal; feeding, by the processor, an input of a secondary transmission path with the output from the first transfer function, the secondary transmission path being coupled to the processor, further wherein a first intermediate signal is produced at an output of the secondary transmission path; generating a first cancellation signal based upon the first intermediate signal; and combining, in the at least one combining element, the first cancellation signal with the received signal so as to reduce the self-interference in the output signal from the receiver. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 25, 56, 57, 58, 59, 60)
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Specification