One-Shot Blind Channel Estimator for OFDM with Multi-Antenna Reception

Abstract

In the recent literature, Saci et al. [1] proposed a novel blind channel estimator for Orthogonal Frequency Division Multiplexing (OFDM) systems, denoted as One Shot Blind Channel Estimator (OSBCE). However, the OSBCE is designed and its performance is analyzed for Single-Input Single-Output OFDM (SISO-OFDM). Therefore, of aim of this work is to extend the design and performance evaluation of the OSBCE, to the multiple receiving antenna case, i.e., Single-Input Multiple-Output OFDM (SIMO-OFDM) systems, where we show that SIMO OSBCE can be designed in different variations based on the channel behavior as a function of the Euclidean distance between the symbols used in the OSBCE structure. The mean-squared error (MSE) performance of the OSBCE for SIMO-OFDM is evaluated for different design structures and compared against the pilot-based OFDM system. Moreover, degradation in the system performance as the Euclidean distance between the OSBCE system-related symbols is presented and discussed. The obtained results show that the OSBCE for SIMO-OFDM can achieve reliable estimates, which are equivalent to pilot-based systems, yet with the gain of improved spectral efficiency. Moreover, the OSBCE achieves those reliable estimates with an equivalent complexity to that of the pilot-based scheme for particular OSBCE structures.