A Novel Sampling Synchronization Scheme for OFDM-Based System with Unified Reference Clock

Date Added: Dec 2012
Format: PDF

Due to the constraint of cost and size for mobile wireless communication terminals, many Orthogonal Frequency Division Multiplexing (OFDM)-based systems required the same crystal driving the sampling and the channel frequencies, which leads to the challenge of a more comprehensive sampling clock synchronization scheme needed. In this paper, the effect of sampling clock error on the system performance was analyzed by dividing it into Sampling clock Frequency Offset (SFO) and Sampling Timing Error (STE). After that, the authors proposed a two-stage scheme of sampling clock synchronization based on theoretical derivation: the preliminary SFO was jointly acquired with the carrier frequency offset by using the improved preamble-aided algorithm, the timing drift resulted from residual SFO and STE was tracked based on a phase looped lock.