空间相关信道下分布式MIMO系统中的STBC-VBLAST组合方案

在空间相关信道下分布式多输入多输出(D-MIMO)系统中,提出了一种新的空时分组编码(STBC)和垂直分层空时编码(VBLAST)组合方案.为充分利用D-MIMO系统的拓扑结构和空间相关信道的特性,在下行D-MI-MO系统的每个分布式天线(DA)簇内采用STBC,而在不同DA簇之间采用VBLAST.同时,为了降低系统复杂度并节省总发射功率,采用了基于最小传播路径衰落准则的天线选择方案.仿真结果证明,对比于传统VBLAST方式,所提出的STBC-VBLAST组合方案能显著降低系统误比特率(BER)并提高空间相关信道下BER性能的鲁棒性.因此,该组合方案是实现空间相关信道下D-MIMO系统下行分集与复用的折衷的一种有效方案.

Combined STBC and VBLAST Scheme for Distributed MIMO Systems on Spatial Correlated Channels

A novel combined space-time block code(STBC)and vertical bell-labs layered space time(VBLAST)scheme is developed in this paper for the distributed multiple-input multiple-output(D-MIMO)system on spatial correlated channels.Considering the topological structure of D-MIMO system and the characteristic of the spatial correlated channels,STBC is utilized within each distributed antenna(DA)port while VBLAST is adopted between largely spaced DA ports.In order to decrease the computational complexity and save the total transmit power,a transmit antenna selection scheme by the strategy of minimum propagation path loss is investigated as well.The simulation results prove that the proposed STBC-VBLAST scheme can improve the BER performance obviously compared with conventional VBLAST scheme and keep the BER performance robust over spatial corrected channels.Based on the results of this paper,the proposed STBC-VBLAST scheme appears to be an effective solution to achieve a good trade off between diversity and multiplexing for downlink D-MIMO systems.