Frequency synchronization and phase offset tracking in a real-time 60-GHz CS-OFDM MIMO system

The performance of an Orthogonal Frequency-Division-Multiplexing (OFDM)-based 60-GHz system can be strongly degraded due to carrier frequency impairment and Phase Noise (PN). In this paper we present a practical approach to the design of a frequency synchronization and phase offset tracking scheme for a 60-GHz, Non-Line-of-Sight (NLOS) capable wireless communication system. We first analyse the architecture of the 60-GHz system and propose a simple algorithm for Carrier Frequency Offset (CFO) estimation on the basis of numerical investigations. Then, we explore pilot based and blind tracking methods for mitigation of Residual Frequency Offset (RFO) and Common Phase Error (CPE). Provided are also analysis and implementation results on an Altera Startix III FPGA.