Self-interference cancellation
First Claim
1. A system for full-duplex signal shaping for a full-duplex radio comprising:
- An analog self-interference cancellation component, coupled to a transmit line and a receive line of the full-duplex radio, that removes a first portion of self-interference from a receive signal of the full-duplex radio;
the analog self-interference cancellation component comprising;
a plurality of signal paths, each signal path including a delay element and a scaling element, wherein each signal path receives a sampled transmit signal and outputs a delayed and weighted transmit signal;
a combiner that combines the delayed and weighted transmit signals of the plurality of signal paths to form a self-interference signal representative; and
a controller that controls parameters of the scaling elements; and
A digital filter engine, coupled to the transmit line and the receive line of the full-duplex radio, that removes a second portion of self-interference from the receive signal.
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Accused Products
Abstract
A wireless communication device includes, in part, an analog interference cancellation circuit and a controller. The analog cancellation circuit includes a multitude of delay paths each including a delay element and a variable attenuator. The controller dynamically varies the attenuation level of each of the variable attenuators in accordance with the frequency response characteristic of that attenuator to remove a portion of a self-interference signal present in a signal received by the device. The device measures the frequency response characteristic of the communication channel, used in determining the attenuation levels, via one or more preamble symbols. A second portion of the self-interference signal is removed by the device using a multitude of samples of a transmitted signal and a multitude of samples of a signal to be transmitted.
151 Citations
20 Claims
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1. A system for full-duplex signal shaping for a full-duplex radio comprising:
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An analog self-interference cancellation component, coupled to a transmit line and a receive line of the full-duplex radio, that removes a first portion of self-interference from a receive signal of the full-duplex radio;
the analog self-interference cancellation component comprising;a plurality of signal paths, each signal path including a delay element and a scaling element, wherein each signal path receives a sampled transmit signal and outputs a delayed and weighted transmit signal; a combiner that combines the delayed and weighted transmit signals of the plurality of signal paths to form a self-interference signal representative; and a controller that controls parameters of the scaling elements; and A digital filter engine, coupled to the transmit line and the receive line of the full-duplex radio, that removes a second portion of self-interference from the receive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for full-duplex signal shaping for a full-duplex radio comprising:
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receiving a receive signal of a full-duplex radio; performing analog self-interference cancellation to remove a first portion of self-interference from the receive signal;
wherein performing analog self-interference cancellation comprises receiving a transmit signal of a full-duplex radio;
generating a set of delayed versions of the transmit signal;
scaling the set of delayed versions of the transmit signal to produce a set of delayed and scaled signals;
combining the set of delayed and scaled signals to create a combined signal; and
subtracting the combined signal from the receive signal; andperforming digital self-interference removal to remove a second portion of self-interference from the receive signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification