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一般来说,在数字移动通信中,多径衰落会引起振幅、相位变化,从而导致信号传输特性明显变坏。分集技术是克服这种衰落的方法之一。其中时间分集比较简单,容易实现,主要用在数字信号传输上。本文提出了按照接收电平选择和输出数据的所谓检波后选择方式来实现时间分集的新方案,并从理论、实验两方面研究了它的效果。文章首先阐述了新时间分集技术的工作原理,然后以 MCK 延迟检波方式为倒,分析了时间分集技术改善误码率的效果。最后通过使用瑞利衰落模拟器的室内实验和在东京市内所做的室外移动实验,进一步验证了它的效果。
In general, multipath fading causes amplitude and phase changes in digital mobile communications, resulting in significantly degraded signal transmission characteristics. Diversity technology is one way to overcome this decline. One of the time diversity is relatively simple, easy to implement, mainly used in digital signal transmission. In this paper, we propose a new scheme to realize time diversity according to the so-called detection and selection method of receiving and selecting data and outputting data. The effect of the scheme is studied both theoretically and experimentally. The article first describes the working principle of the new time diversity technique, and then uses the MCK delay detection method as the inverse, analyzes the effect of time diversity technology to improve the bit error rate. Finally, the indoor experiment using the Rayleigh fading simulator and the outdoor moving experiment done in Tokyo are further validated.