An improved timing offset estimation based on symmetric identical training symbol for OFDM systems

An efficient algorithm based on symmetric identical training symbol has been proposed for timing offset estimation in OFDM system. The scheme is based on the transmission of a training symbol composed of two identical halves that have symmetrical property in time domain. In this paper we improve this algorithm by adding phase shift to the second halve of training symbol at the receiver side. This makes timing offset estimation not only robust against carrier frequency offset (CFO), but also the channel and noise effect. Simulation results show the proposed method can improve the performance of timing offset estimation based on symmetric identical training symbol.