1. New Subcarrier Allocation for Uplink-OFDMA under Time-Varying Channels.
- Author
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Kim, Kwanghoon, Park, Hyuncheol, and Kwon, Hyuck M.
- Subjects
FREQUENCY-division multiple access ,TIME-varying systems ,INTERFERENCE channels (Telecommunications) ,SIGNAL-to-noise ratio ,PERFORMANCE evaluation ,DOPPLER effect ,SILICON carbide ,DETECTORS - Abstract
Inter-carrier interference (ICI) and multiuser interference (MUI) occur in an uplink orthogonal frequency division multiple access system if a channel between a mobile user and a base station is rapidly time-varying. To reduce the ICI and MUI, this letter proposes a subcarrier allocation method. The key idea is to allocate a high-speed user's subcarrier near a low-speed user's one. Then, a wide Doppler spread of a high-speed user can be spilled over a low-speed user's subcarrier band with insignificant influence, and the signal-to-interference-plus-noise ratio (SINR) at each high-speed user's subcarrier can be maximized. This can provide a significant performance improvement of multiuser detection in an uplink-OFDMA. [ABSTRACT FROM PUBLISHER]
- Published
- 2013
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