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A Channel Estimation Method for Multipath Feedback Interference Signal Cancellation of RF Repeaters  

Lee, Sang-Dae (서강대학교 전자공학과 디지털전송연구실)
Park, Jin (서강대학교 전자공학과 디지털전송연구실)
Sung, Won-Jin (서강대학교 전자공학과 디지털전송연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.2A, 2008 , pp. 98-106 More about this Journal
Abstract
To reduce the outage probability and to increase the transmission capacity, the importance of repeaters in cellular systems keeps increasing. Unlike optical repeaters which require wireline connections, RF repeaters are easy to install, have low limitations in location and also have a reduced operational expense such as the optical fiber maintenance cost. On the other hand, RF repeaters suffer the interference due to the feedback signals between the transmitter and receiver antennas, hence require an extra interference cancellation method when the amount of the feedback signal reduction by using the shielding is not sufficient. In this paper, a channel estimation method for two-path feedback interference signals in the ICS (Interference Cancellation System) repeaters using baseband signal processing is proposed and its performance is evaluated. When compared with the conventional method which estimates each multipath individually, the proposed method achieves 10 dB performance gain in terms of the normalized mean-squared-error.
Keywords
RF Repeaters; Channel Estimation; Interference Cancellation; Feedback interference; Multipath Channel; Cellular Systems;
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