Adaptive echo cancellation for an on-frequency RF repeater...

Details Adaptive echo cancellation for an on-frequency RF repeater... Adaptive echo cancellation for an on-frequency RF repeater...

2009-05-19

2011-12-06

Donovan, Lincoln (Department: 2816)

Telecommunications

Carrier wave repeater or relay system

Monitoring

Reexamination Certificate

active

08073385

ABSTRACT:
An adaptive echo cancellation system and method employing an algorithm suitable for a digital repeater with sub-band filtering is disclosed. Cross- and auto-correlation measurements used to estimate the residual coupling are computed from normalized cross and power spectrums which avoid the problems associated with narrow bandwidth signal components. The normalized cross- and power spectra are additionally masked in frequency to reduce the influence of interfering spectral components outside of the passband of the sub-band filter. Regularization of the iterative estimation process is applied to maintain stability and compensate for the bandwidth reduction associated with the sub-band filter and the spectral mask.

REFERENCES:
patent: 6996229 (2006-02-01), Gunther
patent: 2002/0181699 (2002-12-01), Pham et al.
U.S. Appl. No. 12/009,667, filed Jan. 22, 2008, Braithwaite et al.

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