摘要
在无线通信系统中,不同场景下有不同的传播模型。为了研究发射分集技术对抗多径效应的性能,文中总结了无线通讯系统中室外场景下的传播模型。针对传统的Okumura-Hata传播模型来研究不同环境下发射信号的功率损耗,在接收端计算各信号副本的接收功率,通过与预设的接收功率门限作比较,得出每个信号副本以及各副本等增益合并后的信号可用性,从而研究发射分集对于信号可用性的提升作用。仿真结果表明,分集技术能明显提升接收机接收信号的可用性。
In the wireless communication system, there are different propagation models under different scenarios. In order to study the performance of transmit diversity technology against muhipath effects, this paper summarizes the propagation model of the outdoor scenes in the wireless communication system. The emitted signal power loss of the traditional Okumura Hata propagation model, under different environments is studied, the copies of signal received power at the receiving end is calculated and compared with the preset received power threshold to obtain the signal availability of each copy and the copy of the equal gain combination in order to study the improvement of the signal availability by the transmit diversity. The simulation results show that the diversity technology can significantly improve the availability of the receiver signal.
出处
《电子科技》
2016年第11期19-21,共3页
Electronic Science and Technology
基金
全国大学生科技创新重点基金资助项目(201310252003)
关键词
无线通信
传播模型
分集技术
多径效应
wireless communication
propagation model
diversity technique
muhipath effect
