大规模MIMO系统中基于动态天线选择的无比率编码协作传输方法研究

In large-scale multiple-input multiple-output (MIMO) systems, plenty of codebooks have to be stored both at the transmitter and the receiver in advance for fixed-rate channel coded cooperation, due to the dynamic cooperative antennas. The rateless coded cooperation based on dynamic antenna selection is proposed in this project. The main contents of this project include three aspects. Firstly, combined with classical antenna selection algorithm, the downlink of large-scale MIMO systems over the random time-varying channels are established. And the dynamic antenna selection algorithm is proposed, considering the channel state information. The existence of the optimal number of selected antennas to maximize the energy efficiency is also proved through the mathematical derivation. Secondly, the number of antenna is investigated in dynamic antenna selection algorithm. And the rateless coded cooperation based on dynamic antenna selection is proposed, which can be adapt to the dynamic cooperative systems by exploiting the rateless characteristic. The cascaded rateless coded cooperation is also constructed in GF(q). Finally, the degree distribution is explored in rateless coded cooperation, and the optimization algorithm is proposed to achieve high performance and low complexity. Through the studies in this project, the restriction of implementation complexity in fixed-rate coded cooperation is broken through, providing technical supports for boosting the engineering implementation of large-scale MIMO systems.

大规模MIMO系统固定码率的编码协作方法，在动态天线选择子集中协助传输时，收发双方需要存储众多数目的编译码矩阵实现复杂度高。本项目提出基于动态天线选择的无比率编码协作方法。结合经典天线选择方法，针对随机时变无线信道下大规模MIMO下行链路系统进行建模分析，提出引入信道状态时变特性的动态天线选择方法，证明能效最大化时最优天线数的存在；研究动态天线选择方法中发送天线阵列的变化，基于无比率编码协作的码率无率性自适应于动态协作系统的思想，提出基于动态天线选择的无比率编码协作方法，研究多进制GF(q)域下级联无比率编码协作方法的构造；研究度分布函数对无比率编码协作方法的影响，提出优化算法，修正基于动态天线选择的无比率编码协作方法，获得高性能低复杂度的系统实现。本项目拟通过对上述问题的研究，解决固定码率的编码协作方法对系统实现复杂度较高的制约，为大规模MIMO技术的工程实现提供理论支撑。

大规模MIMO系统固定码率的编码协作方法，在动态天线选择子集中协助传输时，收发双方需要存储众多数目的编译码矩阵。针对此问题，本项目提出了基于动态天线选择的无比率编码协作方法，证明了能量效率最大化时最优天线数的存在。其次，本项目研究了动态天线选择方法中发送天线阵列的变化，基于无比率编码协作的码率无率性自适应于动态协作系统的思想，研究了多进制GF(q)域下多用户传输系统/基站间协作传输系统的差错性能。最后，本项目在研究度分布函数对基于动态天线选择的无比率编码协作传输方案差错性能影响的基础上，引入天线选择和功率分配对能量效率的影响，研究了天线选择和功率分配的联合迭代优化算法。