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A Channel Estimation Technique Based on Pilot Tones for OFDM Systems with a Symbol Timing Offset  

Park, Chang-Hwan (중앙대학교 전자전기공학부 디지탈통신연구실)
Kim, Jae-Kwon (연세대학교 원주캠퍼스 디지털통신 연구실)
Lee, Hee-Soo (한국전자통신연구원)
Cho, Yong-Soo (중앙대학교 전자전기공학부 디지탈통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.10A, 2007 , pp. 992-1003 More about this Journal
Abstract
In this paper, a channel estimation technique based on pilot tones, which does not degrade channel estimation performance even with the existence of symbol timing offset (STO) in OFDM systems, is proposed. The proposed technique performs channel estimation by interpolating channels with respect to amplitude and phase with a minimum computational complexity, differently from the conventional interpolation techniques. The proposed technique requires neither the estimation of fine STO in advance nor trigonometric operation for phase interpolation, signifying a significant reduction in computational complexity. Since the performance of the proposed technique does not depend on the STO present in OFDM systems. It can be directly applied to the following areas in OFDM-based communication system: elimination of fine STO estimation step in the synchronization procedure, elimination of STO estimation step in multiuser uplink, and channel estimation in multi-hop relay system. It is verified by computer simulation that the proposed technique can improve the performance of channel estimation significantly in the presence of STOs, compared with previous channel estimation techniques based on pilot tones.
Keywords
OFDM; Symbol Timing Offset; Channel Estimation; Pilot; Interpolation;
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