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Timing and frequency synchronization are the im- portant task in receiver. This paper proposes a timing synchro- nization and carrier frequency offset (CFO) estimation algorithm for orthogonal frequency division multiple access (OFDMA) downlink in IEEE 802.16e standard. This method has high per- formance and estimates CFO. The proposed scheme utilizes the conjugate symmetry property of preamble structure. Simulations are conducted for AWGN and multipath channels to demonstrate the performance of the proposed timing metric. Our proposed method can achieve reasonable performance at low SNR. Keywords—timing synchronization, carrier frequency offset estimation, IEEE 802.16, AWGN channel, multipath fading channel. In this paper, we propose a metric method that do timing synchronization and can estimate CFO by knowing preamble in receiver. The proposed method has high performance even in low SNR. The following sections of this paper are organized as follows: in Sect. 2, the system model and the conjugate symmetry character of BPSK-OFDM symbol are described. In Sect. 3, we present the existing methods. In Sect. 4, we introduce our proposed algorithm. In Sect. 5, simulation results are demonstrated and finally the conclusion is given in Section 6.

Timing Synchronization and Frequency Offset Estimation for OFDMA/TDD Mode in Downlink of IEEE 802.16-2004