Bounds and joint estimators for channel, phase noise, and timing error in communication systems using statistical framework

摘要

Bounds and joint estimators for channel and phase noise, together with timing error in the communication systems are described in this paper. We consider the wireless communication systems using Orthogonal Frequency Division Multiplexing (OFDM) with Multiple Input Multiple Output (MIMO) techniques. A MIMO-OFDM system having the influence from impairments of the channel, timing, and phase is modeled. Also, a modified signal model is developed, with the timing error embedded in the channel. Derivation of Bayesian bounds for the estimation error is done. We propose a joint Bayesian estimator for channel and phase noise with timing ambiguity in a MIMO-OFDM single-user communication system. A modified algorithm with low complexity is also developed. The analysis of the estimation performance variation due to change in the number of antennas is done. Further, the consequence of channel statistics and noise information inaccuracy on estimator performance is analyzed. (C) 2018 Elsevier Ltd. All rights reserved.