D2D系统中带QoS约束的多天线选择及性能分析

本文研究了蜂窝直通通信（Device-to-Device，D2D）系统中基站端多天线选择问题，即在基站传输过程中选择多于一根天线进行传输。借助于次序统计的相关结论，本文分析了该D2D系统的整体性能。本文首先针对基站内的激活用户和D2D用户分别推导了概率密度函数和累积密度函数，进而得到了D2D系统的整体中断概率。基于推导结果，本文提出了一种基于服务质量（Quality of Service，QoS）约束的多天线选择方案来进一步提高基站端的能效，其中所需的天线数根据QoS约束和发送信噪比来确定。论文最后通过仿真验证了所做推导的正确性，以及展示了本文所提方案相对于最优天线选择的优势。 

Performance Analysis of Multiple Antenna Selection with QoS Constraint in D2D networks

This paper investigates the multiple antenna selection at base station in device-to-device (D2D) cellular networks, where more than one antenna participates in the data transmission. With the help of order statistics, the overall performance of the D2D system is analyzed. By deriving the probability density function (PDF) and cumulative density function (CDF) of the receive signal of the active user and D2D user respectively, the overall outage probability of the D2D system is obtained. With the derivation results, a quality of service (QoS) based multiple antenna selection scheme is proposed to further improve the energy efficiency at the base station of the D2D system, where the number of selected transceiver antennas is determined by both of the QoS constraint and transmit signal-to-noise ratio (SNR). Finally, the Monte Carlo simulation results show the accuracy of the derivation in the paper and the advantage of proposed scheme to the best antenna selection.