两射线模型衰落仿真
一、仿真目的
移动传播环境是复杂的，实际上由于众多反射波的存在，在接收机端是大量多径信号的叠加，为了使问题简化，可以从最简单的两径传播模型分析出发，然后再考虑多径的情况。
二、仿真原理
两射线模型指一条直达路径（LOS）和一条反射路径的电波传播模型。设发射天线高度为，接收天线高度为，两天线间的水平距离为，如下图所示
直达射线的长度为
反射路径的长度为
传输函数为
为反射系数。
设，，仿真幅度大小与距离之间的关系
三、参考仿真代码
clear all
ht=10 hr=2
c=3e8 f=1e9 lambda=c/f
R=-1
d=1:0.5:10000
d1=sqrt(d.^2+(ht-hr)^2)
d2=sqrt(d.^2+(ht+hr)^2)
a1=exp(j*2*pi.*d1/lambda)./d1
a2=R*exp(j*2*pi.*d2/lambda)./d2
a=abs(a1+a2)
ld=log10(d) la=log10(a)
figure (4)
plot(ld,la)
xlabel( log10(距离) )
ylabel( log10(幅度) )
title( 两射线模型 )
Two ray model fading simulation
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某旅馆有n个等级的房间；第i等 级有a1个房间；每个房间有b1个床位（1≤i≤n）。旅馆管理系统提供如下服务：
为单身旅客分配床位。根据旅客性别要求（所需要房间等级 ），进行分配，若分配成功，输 出旅客ID、性别、房间等级、 房间号码；分配失败时，若所有等级均无空位，则输出“客满” ，若旅客需要的等级无空床位，但其他等级有床位，则输出“是否 愿意更改等级”的询问。若旅客愿意更改，则重新输入有关信息，再进行分配；否则，分配工作结束。
当单身旅客离店时回收床位 。根据旅客提供情况（房间等级、房间号码、床位号码）进行回收。
Grades in a hotel room with n the first grade i have a1-room each room has b1 beds (1 ≤ i ≤ n). Hotel management system provides the following services:
Distribution of beds for single travelers. According to passengers gender requirements (need room level), for distribution, if the distribution of success, the output passenger ID, gender, grade room, the room number allocation failure, if there was no space for all grades, the output is "full up", if the passenger required level of non-empty bed, but other levels of beds, the output is "willing to change the level of" inquiry. If passengers are willing to change, then re-enter the information, further distribution Otherwise, the distribution is completed.
When passengers check-out single bed when the recovery. According to passengers the situation (room level, room number, bed number) for recycling. (2010-04-30, WORD, 1552KB, 下载3次)
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This is the 97 wavelet and its upgrade process document, from a web site from top to bottom, on the word document. (2007-07-27, WORD, 22KB, 下载9次)