蜂窝通信系统中天线选择在虚拟MIMO的应用
doi: 10.3724/SP.J.1146.2007.00378
Virtual MIMO with Antenna Selection for Mobile Cellular Communications
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摘要: 天线选择技术(AS)和虚拟MIMO(Virtual MIMO，VMIMO)技术都被广泛应用于只有一个无线射频(RF)模块的上行通信传输中。为了使两者的优势都得以发挥，该文提出将天线选择技术应用在虚拟MIMO系统中，该文中称作VMIMO-AS系统。然而，仅从被调度用户设备(User Equipment，UE)中选择最好的天线组成虚拟MIMO并不能确保系统获得最佳的性能。该文提出了VMIMO-AS系统中几种不同用户设备配对算法，并对这些算法就吞吐量性能和用户间公平度进行了比较。仿真结果表明第1个用户的选择需要应用AS原则，而考虑到复杂度和性能的折中，配对用户的选择则不需要应用AS原则。Abstract: Antenna Selection (AS) technique and Virtual MIMO(VMIMO) technique have been widely used in uplink transmission, where the User Equipment (UE) has two antennas but only one Radio Frequency (RF) link. With a view to fully take the advantages of these two techniques, in this paper we apply the AS technique in the VMIMO system, as VMIMO-AS system. However, when both the VMIMO and the AS are applied, always choose the better antennas from the users to form the VMIMO could not guarantee the optimal performance. In this paper, the UE pairing algorithms for the VMIMO system with antenna selection was studied. Different user pairing algorithms are proposed and their throughput and fairness performance are compared. Simulation results show that the first UE should be selected by using the AS technique. Comparably, the selection of the pairing user does not need the AS process, considering the trade-off between the complexity and performance.
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