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Preamble Design for OFDM-based WLAM Systems with Multiple Transmit/Receive Antennas  

이서구 (연세대학교 전기전자공학과 정보통신SCO설계연구실)
정윤호 (연세대학교 전기전자공학과)
김재석 (연세대학교 전기전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.2A, 2004 , pp. 202-213 More about this Journal
Abstract
In this paper, we propose a preamble structure and synchronization/channel estimation methods for OFDM-based multiple antenna WLAN systems that have 200Mbps transmit rate. With the proposed preamble structure, multiple antenna WLAN systems are backward-compatible with IEEE 802.11a systems which use the same 5㎓ band and synchronization performance is better than that of single antenna OFDM systems. For channel estimation, the preamble overhead is small and performance degradation by timing synchronization error that causes the critical problem of conventional comb-type multiple antenna channel estimation method also can be minimized by frequency domain phase recovery. Synchronizer and channel estimator for proposed preamble structure are implemented and verified using Verilog HDL. For the system with 4 transmit antennas and 4 receive antennas, about 150K gates are needed for synchronizer and 12K gates for channel estimator.
Keywords
channel estimation; multiple antenna; preamble; synchronization; WLAN;
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