论文标题
缓冲辅助的多端继电器系统的替代分布式波束形成
Alternate Distributed Beamforming for Buffer-Aided Multi-Antenna Relay Systems
论文作者
论文摘要
在本文中，链接选择将以半双链（HD）双跳合作系统进行研究，并在继电器上具有多个天线。对缓冲辅助的多Antenna继电器系统进行了替代分布式波束形成（ADB）方案，其中继电器分为两组，其中一组接收了从源来广播的相同信息，而另一组通过每个时段中的分布式光束将通用消息传输到目的地。值得注意的是，无需瞬时通道状态信息（CSI）确定用于接收和传输的继电器。提供了对瑞利褪色中提出的方案可实现的吞吐量的理论分析，并得出了近似封闭形式的表达式。给出仿真结果以验证理论分析。通过数值结果，与现有的链接选择策略相比，固定的调度ADB方案可实现可实现的吞吐量的显着改善。还表明，对于ADB方案，增加每个继电器配备的天线数量的吞吐量性能优于增加带有单个天线的继电器数量时，当继电器上的天线总数固定时。
In this paper, link selection is investigated in half-duplex (HD) dual-hop cooperative systems with multiple antennas at the relays. Alternate distributed beamforming (ADB) scheme is revisited for buffer-aided multi-antenna relay systems, in which the relays are divided into two groups, with one group receiving the same information broadcast from the source and the other group transmitting the common messages to the destination via distributed beamforming in each time slot. It is worth noting that the relays used for reception and transmission are determined without the need of instantaneous channel state information (CSI). Theoretical analysis of the achievable throughput of the proposed scheme in Rayleigh fading is provided and the approximate closed-form expressions are derived. Simulation results are given to verify the theoretical analysis. Through numerical results, it is shown that compared with existing link selection policies, the fixed scheduling ADB scheme achieves a significant improvement in achievable throughput. It is also shown that for the ADB scheme, the throughput performance of increasing the number of antennas equipped at each relay is better than that of increasing the number of relays equipped with a single antenna when the total number of antennas at the relays is fixed.
