Robust Cyclic Space-Frequency Filtering for BICM-OFDM With Outdated CSIT
In this paper, the authors introduce robust Cyclic Space - Frequency (CSF) filtering for systems combining Bit - Interleaved Coded Modulation (BICM) and Orthogonal Frequency Division Multiplexing (OFDM). The proposed robust CSF filtering scheme exploits outdated Channel State Information at the Transmitter (CSIT) and takes into account the reliability of the CSIT via a Bayesian model. Based on an upper bound on the worst - case pairwise error probability they formulate the optimization problem for the robust CSF filters which can be solved exactly for certain special cases. For the general case, the authors obtain an approximate solution by solving a related problem with additional constraints.