EFFECT OF PER-USER THRESHOLD SCHEDULING OVER DIFFERENT FADING CHANNELS

In this paper, we investigate scheduling algorithm for the downlink of a multiple input multiple output (MIMO) multiuser wireless system. A scheduling scheme is proposed that exploits multiuser diversities available in the channel. A scheduling scheme with per-user threshold in MIMO systems is proposed and then analyzed for various fading channels. The conventional scheduling scheme uses a common feedback threshold for all the users and analyzed for Single-Input and Single-Output systems. The proposed scheme constructs a sequence of feedback threshold, such that, each user compares its instantaneous Signal-to-Noise Ratio (SNR) with their corresponding threshold in the sequence. The threshold is a function of long-term average SNR of the users as well as the number of users involved in the process. Numerical and simulation results show that, due to the flexibility of the per-user feedback threshold, fairness is obtained. Also, the system capacity of the proposed scheme is better than the conventional scheme. Finally, the performances of different fading channels are evaluated and compared.