A new multiplierless symbol synchronization algorithm for IEEE802.11x WLANs

This paper presents an efficient multiplierless timing synchronization algorithm for OFDM symbols in WLANs following 802.11x protocols which requires using numerous multipliers to correlate the received training sequence with local long training sequence in FH (frame header). The proposed algorithm approximates and quantifies the value of the long training sequence elements to the nearest value of integer power of 2 based on the IEEE 802.11x protocols, then the multiplication can be directly simplified as a shift operation in the correlator of symbol synchronization section. The presented algorithm doesn´t need to incorporate any multiplication or addition when comparing with the existing algorithms. Besides, its implementation complexity is drastically reduced by merely utilizing the logic resources in FPGA. A simulation was carried out in the Simulink platform, and the results shows that the proposed algorithm performs almost the same as the traditional technique with multiply correlators. However, it performs much better at given low SNR than the existing multiplierless correlators algorithm.