Iterative baseband correction of phase noise in OFDM systems for transmission over multi-path and AWGN channels

Abstract

In this paper, we present a novel iterative approach for canceling the phase noise generated by imperfect local oscillators in Orthogonal Frequency Division Multiplexing receivers. After the cancellation of Common Phase Error (CPE), an iterative technique is introduced which estimates Inter- Carrier Interference (ICI) components in the frequency domain and cancels their contribution in the time domain. Simulations are conducted in order to investigate the influence of several parameters, such as the modulation scheme, the number of carriers and the phase noise bandwidth on the system's performance. Channel coding is used in conjunction with our iterative algorithm, for the correction of residual errors. Simulation results are presented for the case of AWGN and multi-path fading channels. In this paper, we propose a novel iterative procedure for correcting the phase noise induced by imperfect oscillators on the OFDM signal, based on a low-complex estimation of frequency components followed by a cancellation in the time domain. The paper is organized as follows: We begin by a brief presentation of the transceiver baseband system in the presence of phase noise. Then, we describe our iterative algorithm for the correction of the different phase noise components. Finally, we present the results obtained by our simulations for different system configurations or channel conditions.