Long-Term CSI Based Multi-User Scheduling for Collaborative Spatial Multiplexing in Mobile-WiMAX

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Lee, Jin-Woo; Lee, Yong-Hwan
Issue Date
ITA workshop'09. Information Theory and Applications Workshop, Feb. 2009
collaborative spatial multiplexingergodic sum-ratefeedback signaling overheadmobile-WiMAX systemreceive correlationscheduling complexity
In this paper, we propose a multi-user scheduling scheme to maximize the ergodic sum-rate of the
uplink of a multi-user multiple-input multiple-output wireless system. The proposed scheduling scheme
only utilizes the receive correlation information of users without instantaneous channel state information
(CSI). It can be applied to the collaborative spatial multiplexing mode specified in the IEEE 802.16e
mobile-WiMAX system, where the number of users in transmission is limited to the number of receive
antennas of the BS at each time slot. An upper-bound analysis and numerical results show that the
proposed scheduling scheme outperforms conventional random scheduling scheme in terms of the ergodic
sum-rate without loss of opportunity fairness. Moreover, the proposed scheduling scheme can provide an
ergodic sum-rate comparable to full-CSI based scheduling scheme in the presence of user mobility, while
significantly reducing the feedback signaling overhead.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Others_전기·정보공학부
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