| Summary: | 碩士 === 國立成功大學 === 工程科學系 === 102 === Synchronization is critical in the design of an OFDM receiver. Large timing offsets result in a loss of orthogonality between subcarriers, ISI, and severe bit error degradation. To minimize this degradation, standards incorporate preambles intended for all OFDM acquisition functions including automatic gain control (AGC) and synchronization. However, the IEEE 802.11 specification adopts Golay sequences as the preambles, which have special autocorrelation properties. Accordingly, conventional synchronization algorithms using the matched filter cannot be applied in Golay sequences. To address this issue, this paper presents a design and implementation on timing synchronizer for Golay sequences. In order to improve the synchronization performances of OFDM systems, we propose a novel and efficient algorithm according to the special autocorrelation properties of Golay sequences. The performance is evaluated by the register-transfer-level (RTL) model which is implemented on FPGA. Finally, the hardware architecture is implemented and verified by Wireless Open-Access Research Platform.
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