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http://dx.doi.org/10.7840/KICS.2011.36A.2.91

Dual NLMS Type Feedback Interference Cancellation Method in RF Repeater System  

Park, Won-Jin (경희대학교 전자전파공학과)
Park, Yong-Seo (경원대학교 전기공학과)
Hong, Een-Kee (경희대학교 전자전파공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.36, no.2A, 2011 , pp. 91-99 More about this Journal
Abstract
Several repeater systems are used to enhance the cell coverage to location such as shadow and rural areas in mobile systems. But the general RF repeater solutions are not suitable for high power outdoor environment because it has the weakness such as self oscillation problem With adoption of a adaptive digital filter technology, feedback interference cancellation repeater prevents oscillation by detecting and canceling the unwanted feedback signal between transmission and receiver antenna. In this paper, dual NLMS based interference cancellation method is proposed and the step size adaptation can be implemented by the estimation of the feedback channel Doppler frequency characteristics. The performance of the proposed algorithm is quantified via analysis and simulation for the static and multipath fading feedback channels.
Keywords
Dual NLMS; Step Size; Doppler Frequency; RF Repeater; Cancellation;
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