On pilot design for channel estimation and MUI reduction in uplink OFDMA systems

Authors:
Wei-Chieh Huang;Xin-Zhe He;Chih-Peng Li;Hsueh-Jyh Li
Affiliations:
Graduate Institute of Communication Engineering, National Taiwan University, Taipei, Taiwan;Institute of Communications Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan;Institute of Communications Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan;Graduate Institute of Communication Engineering, National Taiwan University, Taipei, Taiwan
Venue:
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Year:
2009

Citing 3
Cited 0

Channel Estimation for OFDMA Uplink: a Hybrid of Linear and BEM Interpolation Approach

IEEE Transactions on Signal Processing
A time and frequency synchronization scheme for multiuser OFDM

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Channel-independent synchronization of orthogonal frequency division multiple access systems

IEEE Journal on Selected Areas in Communications

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Abstract

One of the major drawbacks of the orthogonal frequency division multiple access (OFDMA) system is the multi-user interference (MUI) induced by the carrier frequency offsets (CFOs). In sub-band based OFDMA systems, users occupy consecutive and non-overlapping frequency sub-bands. The pilots are usually placed on the edges of a sub-band for channel estimation. However, the channel estimation performance is seriously degraded by the MUI. Traditionally, the MUI is alleviated by inserting a guard sub-carrier between adjacent users. In this paper, a novel pilot architecture is proposed, where three pilots are placed on each edge of a sub-band and pilots of adjacent users are overlapped. The proposed architecture has the same bandwidth efficiency as that of the conventional guard sub-carrier insertion scheme and provides better channel estimation performance and MUI reduction.