NDLI: Low-Complexity CFO Compensation for Uplink OFDMA Systems

Content Provider	IEEE Xplore Digital Library
Author	Chao-Yuan Hsu Wen-Rong Wu
Copyright Year	2006
Description	Author affiliation: Nat. Chiao Tung Univ., Hsinchu (Chao-Yuan Hsu; Wen-Rong Wu)
Abstract	Orthogonal frequency-division multiplexing multiple access (OFDMA) has been considered as a promising multiple access technique in OFDM-based communication systems. In the system, all users share subcarriers in a frequency-division multiplexing manner. Similar to OFDM systems, the carrier frequency offset (CFO) induces inter-carrier interference (ICI) degrading the system performance seriously. However, since the CFO for each user may be different, the compensation turns out much more complicated than that in OFDM systems. A simple method to this problem is the use of a direct zero-forcing (ZF) method which involves the inverse of a matrix. The required computational complexity becomes prohibitively high when the number of subcarriers is large. In this paper, we propose a low-complexity method to overcome the problem in an interleaved uplink OFDMA system. We explore the special structure of the CFO-induced interference matrix and develop a method to solve the matrix inversion problem with fast Fourier transform (FFT). The proposed method can reduce the required computational complexity from $O(N_{c}$ $^{3})$ to $O(N_{c}log_{2}N_{c}).$ From the simulations, we can see that the proposed method can perform as well as that of the direct ZF method while the required complexity is much lower
Sponsorship	IEEE COM
Starting Page	1
Ending Page	5
File Size	155274
Page Count	5
File Format	PDF
ISBN	1424403294
DOI	10.1109/PIMRC.2006.253948
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-11
Publisher Place	Finland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Computational complexity Degradation Frequency division multiplexing System performance Fast Fourier transforms Computational modeling Interference cancellation Land mobile radio Mobile communication
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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