FREQUENCY DOMAIN FEEDBACK CHANNEL ESTIMATION FOR AN INTERFERENCE CANCELLATION REPEATER INCLUDING SAMPLING OF NON CAUSAL TAPS
First Claim
1. A method for estimating a feedback channel for a wireless repeater in a wireless communication system, the wireless repeater having a first antenna and a second antenna to receive a receive signal and transmit an amplified signal, the receive signal being a sum of a remote signal to be repeated and a feedback signal resulting from the feedback channel between the first and second antenna of the wireless repeater, the method comprising:
- using blocks of N samples of the amplified signal as a pilot signal;
using blocks of N samples of the receive signal;
estimating the feedback channel between the first antenna and the second antenna using frequency domain channel estimation using samples of the pilot signal and samples of the receive signal;
generating a time domain feedback channel estimate from the frequency domain channel estimation, the time domain feedback channel estimate having N taps; and
retaining M1 causal taps and M2 non-causal taps in the time domain feedback channel estimate, the M1 causal taps being the first M1 taps of the channel estimate and the M2 non-causal taps being the last M2 taps of the channel estimate.
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Accused Products
Abstract
A method for estimating a feedback channel for a wireless repeater uses frequency domain channel estimation on samples of a pilot signal and samples of a receive signal. The pilot signal samples may be delayed to align the largest channel tap to a given reference time. A time domain feedback channel is generated by retaining both the causal taps and the non-causal taps of the channel estimate.
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Citations
21 Claims
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1. A method for estimating a feedback channel for a wireless repeater in a wireless communication system, the wireless repeater having a first antenna and a second antenna to receive a receive signal and transmit an amplified signal, the receive signal being a sum of a remote signal to be repeated and a feedback signal resulting from the feedback channel between the first and second antenna of the wireless repeater, the method comprising:
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using blocks of N samples of the amplified signal as a pilot signal; using blocks of N samples of the receive signal; estimating the feedback channel between the first antenna and the second antenna using frequency domain channel estimation using samples of the pilot signal and samples of the receive signal; generating a time domain feedback channel estimate from the frequency domain channel estimation, the time domain feedback channel estimate having N taps; and retaining M1 causal taps and M2 non-causal taps in the time domain feedback channel estimate, the M1 causal taps being the first M1 taps of the channel estimate and the M2 non-causal taps being the last M2 taps of the channel estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A machine-readable medium comprising instructions, which, when executed by a machine, cause the machine to perform operations, the instructions comprising:
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using blocks of N samples of an amplified signal as a pilot signal; using blocks of N samples of a receive signal; estimating the feedback channel between a first antenna and a second antenna of a wireless repeater using frequency domain channel estimation and using samples of the pilot signal and samples of the receive signal; generating a time domain feedback channel estimate from the frequency domain channel estimation, the time domain feedback channel estimate having N taps; and retaining M1 causal taps and M2 non-causal taps in the time domain feedback channel estimate, the M1 causal taps being the first M1 taps of the channel estimate and the M2 non-causal taps being the last M2 taps of the channel estimate.
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11. A computer-readable medium including program code stored thereon, comprising:
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program code to use blocks of N samples of an amplified signal as a pilot signal; program code to use blocks of N samples of a receive signal; program code to estimate the feedback channel between a first antenna and a second antenna of a wireless repeater using frequency domain channel estimation and using samples of the pilot signal and samples of the receive signal; program code to generate a time domain feedback channel estimate from the frequency domain channel estimation, the time domain feedback channel estimate having N taps; and program code to retain M1 causal taps and M2 non-causal taps in the time domain feedback channel estimate, the M1 causal taps being the first M1 taps of the channel estimate and the M2 non-causal taps being the last M2 taps of the channel estimate.
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12. A wireless repeater, comprising:
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a first antenna and a second antenna configured to receive a receive signal and transmit an amplified signal, the receive 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; and a channel estimation module configured to estimate the feedback channel between the first antenna and the second antenna using frequency domain channel estimation and using a signal indicative of the amplified signal as a pilot signal and using blocks of N samples of the pilot signal and blocks of N samples of the corresponding receive signal, to generate a time domain feedback channel estimate from the frequency domain channel estimation, and to retain M1 causal taps and M2 non-causal taps in the time domain feedback channel estimate, the M1 causal taps being the first M1 taps of the channel estimate and the M2 non-causal taps being the last M2 taps of the channel estimate. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A wireless repeater, comprising:
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first and second means configured to receive a receive signal and transmit an amplified signal, the receive signal being a sum of a remote signal to be repeated and a feedback signal resulting from a feedback channel between the first and second means; and third means for estimating the feedback channel between the first and second means using frequency domain channel estimation and using a signal indicative of the amplified signal as a pilot signal and using blocks of N samples of the pilot signal and blocks of N samples of the corresponding receive signal, for generating a time domain feedback channel estimate from the frequency domain channel estimation, and for retaining M1 causal taps and M2 non-causal taps in the time domain feedback channel estimate, the M1 causal taps being the first M1 taps of the channel estimate and the M2 non-causal taps being the last M2 taps of the channel estimate.
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Specification