Full-duplex self-interference cancellation systems
First Claim
1. A full-duplex transceiver for radio frequency (RF) communications, comprising:
- a digital signal processor that processes digital signals;
a transmit chain that receives a first digital baseband signal from the digital signal processor and converts the first digital baseband signal to a first RF signal for wireless transmission over a first antenna;
a receive chain that receives a second RF signal over a second antenna and converts the second RF signal to a second digital baseband signal, the second RF signal including self-interference;
an auxiliary receive chain that receives a portion of the first RF signal from the transmit chain and converts the portion of the first RF signal to an auxiliary digital baseband signal; and
a self-interference canceller that applies a channel transfer function to the auxiliary digital baseband signal to generate a cancellation signal and subtracts the cancellation signal from the second digital baseband signal, wherein the digital signal processor is configured to determine the channel transfer function based upon an estimate of a wireless channel between the first antenna and the second antenna and an estimate of a wired channel associated with the auxiliary receive chain.
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Accused Products
Abstract
Embodiments of full-duplex self-interference cancellation systems are described. In one embodiment, a full-duplex transceiver includes a digital signal processor that processes digital signals, a transmit chain that receives a first digital baseband signal from the digital signal processor and converts it to a first RF signal, a receive chain that receives a second RF signal and converts the second RF signal to a second digital baseband signal, and an auxiliary receive chain that receives a portion of the first RF signal and converts it to an auxiliary digital baseband signal. The transceiver may further include a self-interference canceller that applies a channel transfer function to the auxiliary digital baseband signal to generate a cancellation signal and subtracts the cancellation signal from the second digital baseband signal to cancel self-interference at the transceiver. The suppression of self-interference in the transceiver assists the transceiver to achieve higher efficiency in full-duplex communications.
26 Citations
18 Claims
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1. A full-duplex transceiver for radio frequency (RF) communications, comprising:
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a digital signal processor that processes digital signals; a transmit chain that receives a first digital baseband signal from the digital signal processor and converts the first digital baseband signal to a first RF signal for wireless transmission over a first antenna; a receive chain that receives a second RF signal over a second antenna and converts the second RF signal to a second digital baseband signal, the second RF signal including self-interference; an auxiliary receive chain that receives a portion of the first RF signal from the transmit chain and converts the portion of the first RF signal to an auxiliary digital baseband signal; and a self-interference canceller that applies a channel transfer function to the auxiliary digital baseband signal to generate a cancellation signal and subtracts the cancellation signal from the second digital baseband signal, wherein the digital signal processor is configured to determine the channel transfer function based upon an estimate of a wireless channel between the first antenna and the second antenna and an estimate of a wired channel associated with the auxiliary receive chain. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A full-duplex transceiver for radio frequency (RF) communications, comprising:
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a digital signal processor that processes digital signals; a transmit chain that receives a first digital baseband signal from the digital signal processor and converts the first digital baseband signal to a first RF signal for wireless transmission; a receive chain that receives a second RF signal and converts the second RF signal to a second digital baseband signal, the second RF signal including self-interference; an auxiliary receive chain that receives a portion of the first RF signal from the transmit chain and converts the portion of the first RF signal to an auxiliary digital baseband signal; and a self-interference canceller that applies a channel transfer function to the auxiliary digital baseband signal to generate a cancellation signal and subtracts the cancellation signal from the second digital baseband signal, wherein the digital signal processor is configured to determine the channel transfer function based upon an estimate of a wireless channel for wireless transmission and an estimate of a wired channel associated with the auxiliary receive chain. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of self-interference cancellation in a full-duplex transceiver, comprising:
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converting, with a transmit chain, a first digital baseband signal to a first RF signal for wireless transmission; receiving a second RF signal and converting, with a receive chain, the second RF signal to a second digital baseband signal, the second RF signal including self-interference; converting, with an auxiliary receive chain, a portion of the first RF signal to an auxiliary digital baseband signal; determining a channel transfer function based upon an estimate of a wireless channel for wireless transmission and an estimate of a wired channel associated with the auxiliary receive chain; generating a cancellation signal by applying the channel transfer function to the auxiliary digital baseband signal; and subtracting the cancellation signal from the second digital baseband signal. - View Dependent Claims (17, 18)
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Specification