C hannel Estimation, Carrier Recovery, and Data Detection in the Presence of Phase Noise in O FD M Relay Systems
Abstract: Due to its time-varying nature, oscillator phase noise can significantly degrade the performance of the channel estimation, carrier recovery, and data detection blocks in high-speed wireless communicationsystems. In this paper, we propose a new data-aided joint channel, carrier frequency offset (CFO) and phase noise estimator for orthogonal frequency division multiplexing (OFDM) relay systems. For the data transmission phase, we propose a new itera&ve receiver that tracks phase noise and detects the transmi'ed symbols. Addi&onally, we derive the hybrid CramĂŠr-Rao lower bound for evaluating the performance of channel estimation and carrier recovery algorithms in OFDM relay networks. Extensive simulations demonstrate that the application of the proposed estimation and receiver blocks significantly improves the performance of OFDM relay networks in the presence of phase noise and CFO.