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A modified LMS filter for interference cancellation system

In repeaters in wireless cellular networks, feedback signals from the service antennas to the receiving antennas may cause oscillation so that they break the system operations. For predictive elimination of feedback signals, an interference cancellation method employing LMS (Least Mean Square) filter is proposed. The feedback signals to the input antenna removes the feedback signals using the auto-correlation with the output signals. For predictive elimination of feedback signals more stably and quickly, the number of LMS filter taps and filter coefficient (μ) can be controlled.