Inter-frame, fine frequency/phase synchronization for simple space-time-coded OFDM receivers

Abstract

This paper proposes an enhanced receiver (Rx) configuration for Multiple-Input, Multiple-Output (MIMO) OFDM systems, operating under the composite effect of PHase Noise (PHN), Residual Frequency Offset (RFO) and the transmission channel, herein modeled as quasi-static but unknown. The proposed Rx identifies the different impairments by exploiting their different time constants and compensates for each one accordingly. It includes a novel inter-frame Fine Frequency Synchronization (FFS) scheme, which is closely coupled to an intra-frame adaptive phase synchronizer/channel estimator. The proposed scheme is evaluated for a 2×2, Alamouti Space-Time Code (STC), and is shown to provide significant performance gain. The theory can be employed with any other STC scheme. © 2007 IEEE.