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Adaptive Interference Cancellation System for Multi-hop Cellular Networks

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Unwanted feedback between the donor (receive) and coverage (service) antennas of a relay (repeater) are created by the radio echoes from the local scatters and direct path antenna isolation limitations. These radio echoes create interference not only in the incoming signal from the base station, but also cause instability in the repeater. In this paper, we present an interference cancellation system (ICS) for the multi-hop cellular networks. We propose a novel multiple-tap radio echo suppressor to give better performance. Our proposed architecture requires few taps and the complexity is greatly reduced. Interference cancellation ability of the ICS is confirmed using a test bench realized on a Xilinx Virtex-4 FPGA platform.

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