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Robust synchronization signal design in machine-type communication

Timing detection is the very first step and the very important part in wireless communication systems. In current LTE system, a ZC-based primary synchronization signal (PSS) is used to obtain the right timing due to its good autocorrelation property. However, the frequency offset in some machine-type communication(MTC) scenarios is very large due to the low cost requirement that the crystal oscillator is cheap and inaccurate. Large frequency offset will remove the "perfect" autocorrelation of ZC and may cause irreducible timing error. A robust PSS design based on a couple of ZC sequences which are conjugated is proposed in this paper to diminish the frequency offset effect. The simulation results demonstrate our proposed PSS could work well under large frequency offset and is better than the differentiation operation in the MTC scenario.