Adaptive echo cancellation for an on-frequency RF repeater using a weighted power spectrum
First Claim
1. A wireless repeater, comprising:
- an input antenna for receiving an input signal;
an output antenna for outputting an amplified signal;
an amplifier for amplifying the received input signal and providing the output amplified signal to the output antenna;
a filter for applying a weighting function to a power spectrum of a measured signal in the wireless repeater thereby obtaining a weighted power spectrum of the measured signal; and
an internal feedback path for adaptively canceling an echo between the output antenna and the input antenna by implementing an adaptive algorithm based on an autocorrelation of the input signal employing the weighted power spectrum of the measured signal,wherein the filter reduces the width of the autocorrelation of the input signal.
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Abstract
A wireless repeater includes an input antenna for receiving an input signal, an output antenna for outputting an amplified signal, and an amplifier for amplifying the received input signal and providing the output amplified signal to the output antenna. Radiated coupling between the input and output antennas causes echoes to be transmitted by the repeater. A filter is used for applying a weighting function to a power spectrum of a measured signal in the wireless repeater thereby obtaining a weighted power spectrum of the measured signal. An internal feedback path is employed for adaptively canceling the echo by implementing an adaptive algorithm based on a autocorrelation of the input signal employing the weighted power spectrum of the measured signal.
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Citations
24 Claims
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1. A wireless repeater, comprising:
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an input antenna for receiving an input signal; an output antenna for outputting an amplified signal; an amplifier for amplifying the received input signal and providing the output amplified signal to the output antenna; a filter for applying a weighting function to a power spectrum of a measured signal in the wireless repeater thereby obtaining a weighted power spectrum of the measured signal; and an internal feedback path for adaptively canceling an echo between the output antenna and the input antenna by implementing an adaptive algorithm based on an autocorrelation of the input signal employing the weighted power spectrum of the measured signal, wherein the filter reduces the width of the autocorrelation of the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for echo cancellation in a wireless repeater, comprising:
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measuring a signal in a signal path of the wireless repeater; applying a spectral weighting function to a power spectrum of the measured signal to obtain a weighted power spectrum; obtaining an autocorrelation of the signal in the signal path of the repeater based on the weighted power spectrum; detecting an echo in the signal path based on the autocorrelation; and adaptively cancelling the echo in the signal path based on the detected echo, wherein the weighted power spectrum reduces the width of the autocorrelation. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A wireless communication system, comprising:
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a base station; and an on-frequency repeater for extending the base station coverage, wherein the on-frequency repeater comprises; an input antenna for receiving an input signal; an output antenna for outputting an amplified signal; an amplifier for amplifying the received input signal and providing the amplified output signal to the output antenna; and an internal feedback path for adaptively cancelling an echo between the input antenna and the output antenna, wherein the internal feedback path comprises; means for measuring a signal in the feedback path; means for obtaining a weighted power spectrum of the measured signal; means for obtaining a signal autocorrelation in the feedback path based on the weighted power spectrum; and means for adaptively cancelling the echo based on the obtained signal autocorrelation. - View Dependent Claims (23, 24)
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Specification