摘要
针对传统MIMO(多输入多输出)系统容量受限的问题,引入3D(三维)MIMO系统模型,将多小区联合传输技术应用于3D MIMO系统以提高系统容量。结合香农理论推导出采用单小区传输和多小区联合传输时的信干噪比,采用简单易实现的迫零预编码算法,分析了基站天线下倾角、用户与基站之间的距离以及小区中的用户数对系统传输速率的影响。仿真结果表明,适当调整基站天线下倾角可以提高系统传输速率,验证了采用多小区联合传输比单小区传输在提高系统传输速率方面具有更优的性能。
In order to solve the problem of limited capacity in traditional MIMO system, the 3D MIMO system model is intro- duced in this paper. The multieell eoordinated transmission technology is applied to the 3D MIMO system to improve the sys- tem capacity. According to the Shannon theory, we derive the expression of signal to interference plus noise ratio in single-cell transmission and multi-cell joint transmission, respectively. Then we adopt the Zero Forcing （ZF） preeoding algorithm, and analyze theinfluenees of the base station antenna down tilt, the distance between the user and the base station, the number of users for the system transmission rate. Simulation results show that appropriate adjustments to the base station antenna tilt can improve the transmission rate of the system. It is also verified the multieell coordinated transmission has better performance in increasing the throughput of the system, whencompared to the single-cell transmission.
出处
《光通信研究》
北大核心
2016年第6期72-75,共4页
Study on Optical Communications
