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Frame Design and Throughput Evaluation for Practical Multiuser MIMO OFDMA Systems

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4 Author(s)
Yong-Up Jang ; Inst. for Inf. Technol. Convergence, Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea ; Jingon Joung ; Won-Yong Shin ; Eui-Rim Jeong

This paper describes the design of a time-division duplexing frame with a variety of pilots for multiuser multiple-input-multiple-output orthogonal frequency-division multiple access (MU-MIMO OFDMA) systems, where the base station and users are equipped with four and two transmitting and receiving antennas, respectively. In addition, a simplified scheduling algorithm for the MU-MIMO OFDMA is proposed, and its computational complexity is analyzed. The proposed scheduling algorithm shows comparable sum achievable rates to the optimal MU-MIMO OFDMA scheduling that searches for user pairs in an exhaustive manner, whereas its complexity is fairly reduced. Furthermore, to verify the performance of MU-MIMO OFDMA systems that employ the proposed frame structure and scheduling algorithm, a system-level comparison of the average cell throughputs between the proposed MU-MIMO and the conventional MIMO OFDMA systems is numerically performed in a practical cellular environment. As a result, vital information on how we can apply MU-MIMO OFDMA schemes in cellular environments is provided.

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Vehicular Technology, IEEE Transactions on  (Volume:60 ,  Issue: 7 )