Open AccessJoint statistical framework for the estimation of channel and SFO in OFDM systems
Author(s) -
Jose Renu,
Hari K.V.S.
Publication year - 2017
Publication title -
iet signal processing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.384
H-Index - 42
ISSN - 1751-9683
DOI - 10.1049/iet-spr.2016.0580
Subject(s) - orthogonal frequency division multiplexing , estimator , cramér–rao bound , algorithm , channel (broadcasting) , maximum a posteriori estimation , computer science , joint (building) , bayesian probability , statistics , estimation theory , mathematics , maximum likelihood , artificial intelligence , telecommunications , engineering , architectural engineering
Joint estimation of channel and sampling frequency offset (SFO) in orthogonal frequency division multiplexing (OFDM) systems, using Bayesian framework, is shown in this study. Hybrid Cramér–Rao lower bounds (HCRLBs) for the estimation of SFO together with channel are obtained. The significance of Bayesian approach in the formulation of joint estimator is shown by comparing HCRLB with the corresponding standard CRLB. The authors propose a joint maximum a posteriori (JMAP) algorithm for the estimation of channel and SFO in OFDM, utilising the prior statistical knowledge of channel. To reduce the complexity of JMAP estimator, a modified MAP algorithm, which has no grid searches, is also proposed. Also, they analyse the effect of inaccurate knowledge of channel statistics and signal‐to‐noise ratio on the estimation accuracy. The estimation methods are analysed by numerical simulations and resultant conclusions validate the better performance of the proposed algorithms when compared with previous algorithms.