关键词: 无线通信, 传播模型, 分集技术, 多径效应

Abstract:

In the wireless communication system, there are different propagation models under different scenarios. In order to study the performance of transmit diversity technology against multipath 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.

Key words: wireless communication, propagation model, diversity technique, multipath effect