OFDM Timing Offset Estimation with Efficient Methodology and Observation of Different Modulation Schemes

In this paper, a new and efficient approach for Orthogonal Frequency-Division Multiplexing (OFDM) timing offset error estimation has been presented without using pilot signal. The effect of timing offset on bit error rate (BER) has been analyzed using BPSK, QPSK, 8-PSK modulation scheme and an analytical expression has been derived using probabilistic equation to estimate timing offset. This will guide us to determine the best modulation scheme and also the actual length of CP which allows more spectral efficient OFDM system. Simulation results show that when SNR is decreased BER increases and BPSK shows superior performance among other modulation schemes, when SNR is lower and in presence and absence of timing offset. The analytically derived estimator is precise and useful.