LTE-A(增强型长期演进)系统上行引入了多天线传输技术来解决终端天线较少的问题。在这种技术背景下, 设计了一种上行传输模式自适应方法以提高系统性能。从传输模式间自适应、单双流自适应和MU-MIMO(多用户多输入多输出)与单天线传输之间的自适应三个方面进行了论述。系统级仿真表明, 基站根据信道条件的变化选择适当的传输方式可以有效地降低用户误码率, 提高系统吞吐量。

A multiple antenna transmission technology is introduced in the uplink of LTE-A systems to solve the problem of the limited number of end-user antennas. In such technical background, an adaptive algorithm for uplink transmission mode is designed to improve the system performance. The adaptation is discussed in three aspects, i.e. between transmission modes, single-dual stream and between MU-MIMO and single antenna transmission. The system simulation results show that selection of proper transmission mode in line with the changes of the channel conditions for the base station can effectively reduce the user BER and improve the system throughput.