Wireless repeater with adaptive equalizer and phase noise compensator for LTE-Advanced uplink

Abstract

In this paper, we propose adaptive equalizer and phase noise compensator in order to effectively cancel feedback channel and phase noise in wireless repeater system based on LTE-Advanced uplink system. In a repeater system, the performance got worse caused by feedback channel and phase noise. In order to cancel feedback channel, we use adaptive equalizer such as NLMS and RLS. And block type pilot is a common pilot pattern in LTE-Advanced uplink standard. So the phase noise compensator exploits block type pilot. Instead of estimating phase noise in other algorithms, the proposed method directly estimates the interference components caused by phase noise and improves estimation accuracy. After that, we reconstruct the interference matrix and suppress the interferences by the inverse matrix method. BER performance of proposed method is satisfied with 12.5dB at 10−4.