Symbol Timing Estimation under Large Frequency Offset and Low Signal to Noise Ratio in OFDM Systems
大频偏低信噪比条件下OFDM系统中的符号定时估计

Symbol timing estimation is one of key problems in OFDM systems. In this paper a new symbol timing estimation algorithm based on a training symbol is proposed. The study shows that the new algorithm is not affected by carrier frequency offset basically, and has strong characteristic of resisting noise. Through adopting this algorithm the timing error is shortened to a half of the sample time interval. Furthermore the frequency-domain training symbol can be used to estimate carrier frequency offset, so only a training symbol is needed to complete joint acquisition of symbol timing and carrier frequency offset.