New Subcarrier Allocation for Uplink-OFDMA under Time-Varying Channels

作者：Kim Kwanghoon^*; Park Hyuncheol; Kwon Hyuck M

来源：IEEE Transactions on Communications, 2013, 61(1): 7-12.

DOI：10.1109/TCOMM.2012.100512.110011

• Time-varying channels
• multiuser interference
• inter-carrier interference
• successive interference cancelation
• OFDMA

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 highspeed 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.

• 出版日期2013-1