Statistical CSIT Aided User Scheduling for Broadcast MU-MISO System

Cao, Qi and Sun, Yanjing and Ni, Qiang and Li, Song and Tan, Zefu (2017) Statistical CSIT Aided User Scheduling for Broadcast MU-MISO System. IEEE Transactions on Vehicular Technology, 66 (7). pp. 6102-6114. ISSN 0018-9545

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Abstract: Recent studies show that the statistical channel state information (SCSI) helps to largely increase the capacity of communication systems when the instantaneous perfect CSI (IPCSI) is unavailable. In this paper, we consider multi-user multipleinput- single-output (MU-MISO) broadcast channels where the transmitter has the knowledge of SCSI. The major issue concerned in our work is to improve the average group-rate of the whole system by scheduling users over different time slots. With SCSI at the transmitter side, we are able to precode signals and hence compute the theoretical achievable group-rate of arbitrary user groups. Based on the group-rates, we propose tier-2 Munkres user scheduling algorithm (T2-MUSA) which leads to higher average group-rate than existing algorithms with generally better fairness. The optimality of the proposed algorithm in energy-fair user scheduling space is proved and we derive a lower bound of a special case to verify the validity of our simulations. In addition, many conventional user scheduling algorithms maintain queue stability by solving a weighted sum-rate (WSR) problem, using queue lengths to represent weight coefficients. Inspired by T2-MUSA we propose a QoS-based Munkres user scheduling algorithm (QB-MUSA) aimed at stabilizing queue lengths and maximizing throughput. In results, we show that QB-MUSA exhibits higher throughput than the conventional weighted sumrate (WSR) based algorithm.

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Journal Article
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IEEE Transactions on Vehicular Technology
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?? automotive engineeringapplied mathematicscomputer networks and communicationselectrical and electronic engineeringaerospace engineering ??
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10 Mar 2017 10:06
Last Modified:
21 Mar 2024 00:43