On Timing and Frequency Offset Estimation for OFDM Systems

A new training symbol weighted by the PN sequence was designed and an efficient timing and frequency offset estimation scheme for orthogonal frequency division multiplexing systems was proposed. The timing synchronization is accomplished by using the piecewise symmetric conjugate of the primitive training symbol and the good autocorrelation of the PN weighted factor. After the time synchronization is finished, the PN weighted factor is removed and the renewed training symbol is used to estimate the frequency offset. Compared with conventional schemes, the proposed scheme can achieve a significantly smaller mean square error and provide a wider frequency acquisition range.