Mobile Channels Modeling And Their Applications In A Point To Multipoint Communication System

Mobile communication is booming recently due to its uniqueness, and weighs heavily in the future personal communication. Inevitably, the received signal is subject to multi-path fading and shadow effect. Thus, the mobile channel between base stations and mobile stations restricts the system's overall performance. Therefore, to explore signal's variation and propagation and establish channel model mean a lot to communication engineering. After inspecting the channel properties, engineers are able to designate the optimistic modulating, coding and multi-access modes, and eventually obtain the effective and reliable communication.Then content of this paper includes:①Firstly, on the basis of investigation in the references about multi-path propagation characteristics of wireless channels, the theoretic physical models and mathematics models, the wireless channel characteristics simulator was constructed. Then through analyzing the characteristics parameters of channels, the Tap-Delay-Line model (a new improved Jakes model) was designed.②According to the fading caused by delay spread, the mobile channels are divided into two kinds: non-frequency-selective(flat)fading channels and frequency-selective fading channels. For the two kinds of fading channels, the Rayleigh multi-path fading characteristics were simulated and analyzed.③For frequency-selective fading channels, on the basis of the Jakes simulation model, the channels characteristics of small-scale fading were simulated.④A channel model was developed according to the practical environment of a point to multipoint communication system. And then, according to the different values of parameters prescribed in COST207, the channel between center station and user station was simulated and analyzed.