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Mitigating Techniques for OFDMA System Based on SDD  

Park, Chang-Hwan (School of Electrical & Electronic Engineering, Chung-Ang University)
Ko, Yo-Han (School of Electrical & Electronic Engineering, Chung-Ang University)
Kim, Moo-Chul (School of Electrical & Electronic Engineering, Chung-Ang University)
Park, Kyung-Won (Advanced Mobile Technology Research Center, Korea Electronics Institute)
Jeon, Won-Gi (Advanced Mobile Technology Research Center, Korea Electronics Institute)
Paik, Jong-Ho (Advanced Mobile Technology Research Center, Korea Electronics Institute)
Lee, Seok-Pil (Broadcasting.Communication Convergence Research Center, Korea Electronics Technology Institute)
Cho, Yong-Soo (School of Electrical & Electronic Engineering, Chung-Ang University)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.8C, 2009 , pp. 742-749 More about this Journal
Abstract
In this paper, we propose mitigation techniques using time-domain shortening filter (TSF) and frequency-domain shortening filter (FSF) to overcome inter-block interference (IBn and inter-carrier interference (ICn due to the time difference of arrival (TDoA) and carrier frequency offset (CFO) between downlink and uplink signals from access point (AP) and subscriber station (SS) in synchronous digital duplexing (SDD)/orthogonal frequency division multiple access (OFDMA) systems for indoor wireless communication. The proposed TSF and FSF maximize SIR for shortening in time (SIRST) and SINR for shortening in frequency (SINRSF), respectively, by using channel impulse responses and timing information among stations, obtained from mutual ranging procedure. It is verified by computer simulation that the proposed TSF and FSF reduce effectively the effects of IBI and ICI in the SDD/OFDMA systems.
Keywords
SDD; OFDM; IBI; ICI; Shortening;
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