SINGLE CHANNEL FULL DUPLEX WIRELESS COMMUNICATION
First Claim
1. A single channel full duplex wireless communication system, comprising:
- a processor;
a transmitter coupled to the processor, the transmitter transmitting a transmission signal via a transmission path;
a receiver coupled 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, the transmission signal causing self-interference;
a secondary transmission path coupled to the transmitter; and
the processor estimating a first transfer function and feeding the secondary transmission path with the transmission signal adjusted by the first transfer function in such a way that the secondary transmission path signal reduces the transmission signal leaked to the reception path;
a combining element coupled to the receiver, the combining element being configured to combine the transmission signal with the adjusted secondary transmission path signal, thereby removing at least a fraction of the self-interference; and
a primary transmission feedback path and a secondary transmission feedback path, the primary transmission feedback path output being modified by a second transfer function and the secondary transmission feedback path output being modified by a third transfer function, such that combining of the modified primary transmission feedback path output and the modified secondary transmission feedback path output to the reception path output reduces the remaining fraction of the self-interference.
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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.
80 Citations
30 Claims
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1. 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; a receiver coupled 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, the transmission signal causing self-interference; a secondary transmission path coupled to the transmitter; and the processor estimating a first transfer function and feeding the secondary transmission path with the transmission signal adjusted by the first transfer function in such a way that the secondary transmission path signal reduces the transmission signal leaked to the reception path; a combining element coupled to the receiver, the combining element being configured to combine the transmission signal with the adjusted secondary transmission path signal, thereby removing at least a fraction of the self-interference; and a primary transmission feedback path and a secondary transmission feedback path, the primary transmission feedback path output being modified by a second transfer function and the secondary transmission feedback path output being modified by a third transfer function, such that combining of the modified primary transmission feedback path output and the modified secondary transmission feedback path output to the reception path output reduces the remaining fraction of the self-interference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of improving signal-to-interference ratio in a single channel full duplex wireless communication system, comprising:
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transmitting a transmission signal via a transmission path; receiving 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 transmission and received signals, the transmission signal causing self-interference; estimating, by a processor, a first transfer function; feeding, by the processor, a secondary transmission path with the transmission signal adjusted by the first transfer function in such a way that the secondary transmission path signal reduces the transmission signal leaked to the reception path, thereby removing at least a fraction of the self-interference, the secondary transmission path being coupled to the transmitter; combining, by a combining element coupled to the receiver, the transmission signal with the adjusted secondary transmission path signal; estimating, by the processor, a second transfer function and a third transfer function; modifying, by the processor, a primary transmission feedback path output signal with the second transfer function and a secondary transmission feedback path output signal with the third transfer function; and adding, by the processor, of the modified primary transmission feedback path output and the modified secondary transmission feedback path output to the reception path output, thereby canceling the remaining fraction of the self-interference. - View Dependent Claims (10, 11, 12)
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13. 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 comprising 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 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 transmitter and to the combining element; and the processor estimating a first transfer function and feeding the secondary transmission path with at least a portion of the transmission signal adjusted by the first transfer function 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; 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 (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of reducing self-interference caused by one or more transmission signals in a single channel full duplex wireless communication apparatus, comprising the steps of:
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transmitting one or more transmission signals using a transmitter, the transmitting occurring via one or more transmission paths coupled to the transmitter, wherein one or more portions of the one or more transmission signals are leaked; receiving one or more received signals using a receiver, the one or more received signals including leakage from the one or more transmission signals, the receiver comprising one or more combining elements and one or more reception paths, wherein at least one combining element is coupled to an input of the receiver, wherein the receiver produces one or more output signals, the one or more output signals including self-interference, the self-interference being caused by the leakage from the one or more transmission signals; generating one or more first cancellation signals;
the generating of one or more first cancellation signals further including;estimating, by a processor, a first transfer function; feeding, by the processor, one or more secondary transmission paths with one or more portions of the one or more transmission signals adjusted by the first transfer function to produce one or more first intermediate signals at output(s) of the one or more secondary transmission paths, each one of the one or more secondary transmission paths being coupled to the transmitter and to the one or more combining elements of the receiver; obtaining the one or more first cancellation signals from the one or more first intermediate signals; combining, using the one or more combining elements within the receiver, the one or more received signals with the one or more first cancellation signals in the one or more combining elements of the receiver, thereby reducing the self-interference in the one or more output signals; generating one or more second cancellation signals;
the generating of one or more second cancellation signals further including;estimating a second transfer function, the second transfer function being estimated by a processor; generating one or more second intermediate signals, the second intermediate signals being generated by obtaining portions of the one or more transmission signals; using one or more secondary transmission feedback path output signals, wherein inputs to the one or more secondary transmission feedback paths are coupled to the outputs of the one or more secondary transmission paths; and modifying the one or more second intermediate signals with the second transfer function to obtain the one or more second cancellation signals; and combining, in the processor, the one or more second cancellation signals with the one or more output signals from the receiver, thereby further reducing the self-interference in the one or more output signals. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification