In this paper, multiuser scheduling algorithms are evaluated for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) networks. These scheduling schemes allocate M [number of transmit antennas at base station (BS)] number of independent data streams from BS to the M most favourable users experiencing the highest signal-to-interference-plus-noise-ratio (SINR). Here, SINR is used to convey the channel state information (CSI) to the BS. We have investigated the system throughput and feedback overhead attained by these scheduling schemes for different scenarios as: (a) the maximum CSI is sent to the BS by every user and (b) the maximum CSI sent to the BS corresponding to every BS antenna. The overall feedback overhead incurred by MIMO-OFDM system increases linearly with number of users, number of subcarriers and number of transmit antennas. Hence, to reduce the feedback overhead, a scheme is proposed where users with SINR values greater than or equal to a predefined threshold value are only allowed to feedback the channel state information to BS. The relation between system throughput and various thresholds is also studied. The achievable system throughput results are validated by comparing the probability density function of achieved SINR values by different scheduling schemes.

本文针对多输入多输出（MIMO）正交频分复用（OFDM）网络评估了多用户调度算法。这些调度方案分配M [从基站（BS）到发射天线的数量]从BS到M的独立数据流的数量最优惠的用户体验到最高的信号干扰加噪声比（SINR）。这里，SINR用于将信道状态信息（CSI）传送到BS。我们已经研究了通过这些调度方案针对不同场景获得的系统吞吐量和反馈开销，这些情况是：（a）每个用户向BS发送最大CSI，以及（b）与每个BS天线对应的最大CSI发送给BS。MIMO-OFDM系统产生的总反馈开销随用户数量，子载波数量和发射天线数量线性增加。因此，为了减少反馈开销，提出了一种方案，其中具有SINR值大于或等于预定阈值的用户仅被允许将信道状态信息反馈给BS。还研究了系统吞吐量与各种阈值之间的关系。通过比较不同调度方案获得的SINR值的概率密度函数，可以验证可达到的系统吞吐量结果。