USE OF RF REFERENCE IN A DIGITAL BASEBAND INTERFERENCE CANCELLATION REPEATER
First Claim
1. A wireless repeater having a first antenna and a second antenna to receive an input signal and transmit an amplified signal, the input signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first antenna and the second antenna, the repeater comprising:
- a first receiver circuit coupled to the first antenna to receive the input signal and generating a digitized input signal;
a first transmitter circuit coupled to generate the amplified signal to transmit on the second antenna based on a digitized transmit signal;
a second receiver circuit coupled to receive at least a portion of a signal to be transmitted prior to transmission over the second antenna and to generate a digitized transmit reference signal; and
a repeater baseband block coupled to the first receiver circuit, the second receiver circuit, and the first transmitter circuit, the repeater baseband block operative to receive the digitized input signal from the first receiver circuit, to access a feedback signal estimate, and to cancel the feedback signal estimate from the digitized input signal to generate the digitized transmit signal for the first transmitter circuit, the repeater baseband block including a channel estimation block to estimate the feedback channel and to provide a feedback channel estimate, the channel estimation block using the digitized transmit reference signal as a reference signal for channel estimation.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless repeater includes an echo canceller to cancel an estimated feedback amount from an input signal and a reference receiver to sample a portion of the transmit signal prior to over-the-air transmission for use as the reference signal for channel estimation. More accurate channel estimation is obtained by using the reference signal from the reference receiver as the reference signal accounts for distortions in the transmitter circuit of the repeater.
58 Citations
22 Claims
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1. A wireless repeater having a first antenna and a second antenna to receive an input signal and transmit an amplified signal, the input signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first antenna and the second antenna, the repeater comprising:
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a first receiver circuit coupled to the first antenna to receive the input signal and generating a digitized input signal; a first transmitter circuit coupled to generate the amplified signal to transmit on the second antenna based on a digitized transmit signal; a second receiver circuit coupled to receive at least a portion of a signal to be transmitted prior to transmission over the second antenna and to generate a digitized transmit reference signal; and a repeater baseband block coupled to the first receiver circuit, the second receiver circuit, and the first transmitter circuit, the repeater baseband block operative to receive the digitized input signal from the first receiver circuit, to access a feedback signal estimate, and to cancel the feedback signal estimate from the digitized input signal to generate the digitized transmit signal for the first transmitter circuit, the repeater baseband block including a channel estimation block to estimate the feedback channel and to provide a feedback channel estimate, the channel estimation block using the digitized transmit reference signal as a reference signal for channel estimation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless repeater having a first antenna and a second antenna to receive an input signal and transmit an amplified signal, the input signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first antenna and the second antenna, the repeater comprising:
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first means for receiving the input signal from the first antenna and for generating a digitized input signal; means for generating the amplified signal to transmit on the second antenna based on a digitized transmit signal; second means for receiving at least a portion of a signal to be transmitted prior to transmission over the second antenna and generating a digitized transmit reference signal; and means for receiving the digitized input signal from the first receiver circuit and generating the digitized transmit signal, the means including a means for estimating the feedback channel and providing a feedback channel estimate using the digitized transmit reference signal as a reference signal for channel estimation.
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16. A method for providing echo cancellation in a wireless repeater in a wireless communication system, comprising:
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receiving an input signal at a first antenna of the repeater, the input signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first antenna and a second antenna; generating a digitized input signal; cancelling a feedback signal estimate from the digitized input signal; generating a digitized transmit signal based on the digitized input signal; generating an amplified signal based on the digitized transmit signal; transmitting the amplified signal on the second antenna; receiving at least a portion of a signal to be transmitted prior to transmission over the second antenna and generating a digitized transmit reference signal; and estimating a feedback channel between the first antenna and the second antenna using the digitized transmit reference signal as a reference signal for channel estimation and providing a feedback channel estimate. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification