Information theoretical results have shown that Distributed Antenna Systems (DAS) can obtain higher capacity than Co-located Antenna Systems (CAS). In this paper,we investigate a downlink port selection and power allocation scheme in Distributed Multiple-Input Multiple-Output (D-MIMO) systems,where Distributed Antenna (DA) ports randomly locate in the cell. The contri-bution of this paper can be summarized as two parts. Firstly,we analyze how antenna correlation af-fects power allocation in D-MIMO systems. Secondly,based on large scale fading and antenna corre-lation,a low-complexity port selection and power allocation scheme is proposed. In the proposed scheme,we take both large scale fading and antenna correlation into consideration. Moreover,User Equipment (UE) only needs to feedback the rank of transmit antenna correlation matrix,which will not increase system complexity too much. Simulation results verify the capacity improvement based on the proposed power allocation scheme.
为克服串行RapidIO(Serial RapidIO,SRIO)互连系统中由于硬件实现的失误和恶劣环境造成的大量噪声与电磁干扰(Electromagnetic interference,EMI),提出了作为现有SRIO规范扩展的鲁棒传输协议(Robust trans portprotocol,ROTP)。ROTP用速率转换和模式转换提高SRIO性能。速率转换可提高恶劣环境下的系统平均吞吐量,模式转换可有效减少对反馈信道的使用。仿真与分析表明,ROTP方法可有效增强SRIO在恶劣环境下的鲁棒性,提高系统性能。
