PNS Algorithm and Simulink Design of Wireless OFDM ICS Repeater with Phase Noise

Abstract – In this paper, we have studied an ICS repeater based on OFDM system considered with phase noise effects by using Simulink. In wireless repeater system, in case of same frequency for transmitted and received signals, the feedback interference signal, which comes into the receive antenna from the transmit antenna of a radio repeater, causes the radio repeater go into feedback oscillation when the gain of a radio repeater is larger than the isolation. In addition, system performance will get worse if there are phase noise effects. Therefore, we propose adaptive feedback channel equalizer and phase noise compensator based on OFDM system in order to reduce feedback channel and phase noise effects. As a results of simulation using by Simulink, we found that ICS repeater with adaptive feedback equalizer and phase noise compensator shows much better performance than without phase noise suppression in case of QPSK and 16QAM. In QPSK, it showed about 5~6dB improvement, and types of 16QAM works about 7~8dB improvement.