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提出了一种聪明的TD-LTE MIMO操作模式,它结合了波束成形技术和闭环反馈MIMO的优点。当eNB获得UE上行SRS参考信号的信道信息,L1进行基于码本的信道估计量化和标签化。L1将标签上传到L2,L2基于标签进行多用户调度,这样较好地解决了基于迫零的UE配对和L1/L2间跨层资源分配这两个问题。L1无需更多计算便可生成波束成形的预编码矩阵。同时,提出了在可接受的次优性能下一种易实现的一般性框架。为了达到目标,给出了新的码本设计标准和快速预编码矩阵的生成算法。
A clever TD-LTE MIMO mode of operation is proposed that combines the benefits of beamforming and closed-loop feedback MIMO. When the eNB obtains the channel information of the UE uplink SRS reference signal, L1 performs the codebook based channel estimation quantization and tagging. L1 uploads the label to L2, and L2 performs multi-user scheduling based on label, which solves the two problems of zero-crossing based UE pairing and L1 / L2 cross-layer resource allocation. L1 generates beamforming precoding matrices without further calculations. At the same time, a general framework that is easy to implement under acceptable sub-optimal performance is proposed. In order to achieve the goal, a new codebook design standard and a fast pre-coding matrix generation algorithm are given.