Low complexity timing synchronisation for high speed wireless local area networks. (1st January 2012) - Viswanathan, Sathish
In this paper, we propose a low complexity coarse timing offset (CTO) and fine timing offset (FTO) estimation algorithm for the MIMO-OFDM-based 802.11n wireless local area network (WLAN) systems. For synchronisation purposes, the preamble of the high throughput mixed mode has a short training field (STF) and a long training field (LTF). Using the STF, an efficient coarse and fine timing estimation algorithm has been proposed for the mixed mode. Since the same STF structure is also used for the green field mode, the proposed technique is applicable for both modes. Effectively, a single coarse and fine timing estimation algorithm can be implemented for all the high throughput modes of 802.11n enabled systems. The performance of the proposed CTO estimator is compared with the performance of the conventional autocorrelation-based technique. Extensive simulation results show that the proposed CTO estimator performs better at lower signal-to-noise ratio (SNRs).