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A design and implementation of timing and frequency synchronization for OFDM-based WLAN

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3 Author(s)
Hun-Sik Kang ; Short-Range Wireless Transm. Team , ETRI, Daejeon, South Korea ; Sok-kyu Lee ; Sin-Chong Park

This paper presents a design and implementation on timing and frequency synchronization for OFDM-based WLAN. Synchronization in OFDM-based receiver is critical for performance and needs a great deal of hardware resources. Based on the discovered symmetries between real and imaginary values in short preamble of IEEE 802.11, applying the symmetries of a short preamble can reduce the hardware complexities of a matched filter to 30% of multipliers and 80% of adders necessary for an existing cross-correlator. For frequency synchronization, we also propose the phase estimation method using a binary search to identify the phase of a complex short preamble. It does not need to employ divider or memory to find out the phase. The OFDM-based WLAN PHY containing the proposed synchronization block is implemented on a field-programmable gate array of XCV8000, and its utilization factor amounts to about 25% of all slices.

Published in:

Industrial Electronics & Applications, 2009. ISIEA 2009. IEEE Symposium on  (Volume:2 )

Date of Conference:

4-6 Oct. 2009