2FSK调制解调实现通信原理课程设计

1、In order to ensure normal teaching order, protecting students healthy growth, ensuring that national (property) is not lost, to prevent or minimize the occurrence of safety accidents, follow the prevent, rescue each other, ensure safety and reduce losses principle, according to the local conditions,

2、 make the management system. 1, the principal is the responsibility of school safety, school security under the leadership of President security work leading group. The head teacher to the leadership team is responsible for, implementation of the accountability system. 2, school monthly student know

3、ledge about safety education, education should be diversified in the form every safety education for students of classes per week should be targeted. To carry on emergency issues dealing with education in General, self-help and mutual rescue knowledge. Emergency calls (such as 110, 119, 122, 120, an

4、d so on) use common sense in education. 3, the establishment of major accident reporting system. School students report major accident within an hour of education; student run and disappearances to report; report of the accident to a written report in triplicate, a correctional centre, a police stat

5、ion, a township peoples Government shall not conceal the accident. 4 week, teachers are on duty system, establish and improve the leadership values; strengthen the education, management of teaching activities in schools to ensure normal teaching order; responsible for school safety leadership always

6、 maintained close contact and district police stations, canvassing support from the police station on school safety and help. 5, strengthening teachers moral education, establish a dedicated love, improving education quality, observe the students psychological changes at any time and take preventive

7、 measures, no corporal punishment and covert corporal punishment on students, student out of the classroom, schools may not be. 6, units or departments use student Street propaganda or participate in the celebrations, as well as participating in other social work, without approval of the Correctiona

8、l Centre, school principals consent, without organization. Without the approval of relevant departments, may organize students to participate in fire fighting, disaster relief and so on. 7, schools should educate students to obey the school rules and regulations, on time, on time home to prevent acc

9、idents. 8, school to school inspections on a regular basis, found hidden in time, and in severe cases, it is hard to eliminate immediately closed, and reported to the local peoples Government, education, and rule of law section. 9, the school should always check the internal walls, retaining walls,

10、ponds, railings, handrails, doors, Windows, staircases and a variety of sports, extracurricular activities, facilities such as fire safety, infrastructure security, unsafe facility to immediately repair and demolition to ensure that teachers and students work, learn, live venues and facilities are s

11、afe and reliable. Song Lin Xiang Liu Jia ping elementary school March 2016 song Lin Xiang Liu Jia ping primary school fire safety systems to enhance fire safety, protection of public property and the life and property safety of teachers and students, school fire safety into day-to-day management, is

12、 developing the following fire safety system. 1, strengthen fire safety education of the whole school. According to the requirements of the Fire Services Act, so that everyone has of keeping fire control safety, protecting fire control facilities, fire prevention, reports of fire课 程 设 计 报 告课程名称： 通信系

13、统课程设计 设计名称： 2FSK调制解调仿真实现 姓 名： 学 号: 班 级： 指导教师： 起止日期： 编制本施工方案时，分析了本工程的工程特点，地质条件和设计要求，结合我公司其它工地施工经验及教训，本着创一流的质量Electricity lines, equipment inspections, found hidden in time for rectification, maintenance, and security. 9, do not use an open flame in the classroom, prohibit burning stove, lit candles,

14、mosquito repellent, no smoking, and banning messy wiring. Without using any household appliances is not allowed. 10, live on campus faculty members, must lead by example, and educate families and children ready to fire. 11, household use of gas in schools, to master proper usage, pay attention to th

15、e leak-proof, explosion-proof, fireproof, closing valve after use to ensure security. 12, dining room must be qualified, and annual testing of pressure vessels, to regularly check, the canteen workers must be certified, strictly by operation operation, gas tank and stove safety distance of 1.5 meter

16、s, to prevent accidents. 13, the adverse consequences caused by ignoring fire safety regulations, will be punished, until investigated for legal responsibility. Song Lin Xiang Liu Jia ping elementary school March 2016 Xiang Liu Jia ping elementary school, pine slopes surrounding safety management sy

17、stem 1 teachers and students, the surrounding area of the school governance covers personal and food hygiene, cultural events and other aspects, integrated governance shall obtain wide support and full cooperation of the community. On the surrounding environment in schools should be closely monitore

18、d. 2, school work at the same time, should pay attention to the safety management of school environment, should take the initiative to contact the district police station, the village Committee, Correctional Centre, Township government, business management and other departments to do a good job mana

19、gement. 3, teacher on duty with the exception of inspections in schools, should also pay attention to environmental inspections near the campus, found that the jobless migrants from rural areas, for example, harassment of students and a variety of accidents, according to different situations reporte

20、d school officials or the police station in a timely manner, to protect the safety of students. 4, every day before school, teachers remind students, pay attention to traffic safety. 5, should educate students to respect social ethics, and various regulations, maintaining public order, and fight the

21、 bad guys, and grasp the correct ways and means of maintaining and improving students self-care ability. 6, the establishment of emergency rescue teams of teachers in schools, on high alert and deployed. Song Lin Xiang Liu Jia ping elementary school March 2016 song Lin Xiang Liu Jia ping primary sch

22、ool teachers and students organizations out of safety management system organization activities between teachers and students, to draw up a precise plan and security measures must be signed by the school officials to review the programme of activities agreed upon Correctional Center agreed to implem

23、ent. Organization to the field relatively far or activities require approval by the Deputy Director of the Education Bureau in charge of security. 2, each activity should have a specific responsibility, pay attention to the persons age, physical match. Route 3, activities, location, field surveys sh

24、ould be carried out in advance. 4, activities for the means of transport should explain the situation to the school to comply with vehicle, safety requirements, before the line for repairs. 5, each activity must have security, emergency response plan for accidents. 6, picnics, hiking, picnic to pay

25、attention to fire prevention, food poisoning, prevention of fall accidents 7, the activities near the rivers, reservoirs, no measures or do not meet the security requirements of the Organization and not let students into the water课 程 设 计 任 务 书学生班级： 学生姓名： 学号： 设计名称： 2FSK调制解调仿真实现 起止日期： 指导教师： 要求：MATLAB编

26、程实现2FSK的调制解调。要求仿真输出：基带信号、2FSK信号和叠加噪声后的2FSK信号波形、解调器各点的信号波形课 程 设 计 学 生 日 志时间设计内容6.176.18查看设计题目，对现代通信原理和数字信号处理的相关内容进行复习6.196.20在已有知识的基础上、查阅资料，设计出总体实现方案6.216.22编写、调试程序，并结合理论验证程序的正确性 6.23基于理论知识和实践结果写课程设计报告6.25答辩课 程 设 计 考 勤 表周星期一星期二星期三星期四星期五课 程 设 计 评 语 表指导教师评语： 成绩： 指导教师： 年 月 日2FSK的调制解调仿真实现一、 设计目的和意义1、 熟练地

27、掌握matlab在数字通信工程方面的应用。2、 了解信号处理系统的设计方法和步骤。3、 理解2FSK调制解调的具体实现方法，加深对理论的理解，并实现2FSK的调制解调，画出各个阶段的波形。4、 学习信号调制与解调的相关知识。5、 通过编程、调试掌握matlab软件的一些应用，掌握2FSK调制解调的方法，激发学习和研究的兴趣；二、 设计原理12FSK介绍： 数字频率调制又称频移键控（FSK），二进制频移键控记作2FSK。数字频移键控是用载波的频率来传送数字消息，即用所传送的数字消息控制载波的频率。2FSK信号便是符号“1”对应于载频f1，而符号“0”对应于载频f2（与f1不同的另一载频）的已调波

28、形，而且f1与f2之间的改变是瞬间完成的。其表达式为：典型波形如下图所示。由图可见,2FSK信号可以看作两个不同载频的ASK信号的叠加。因此2FSK信号的时域表达式又可以写成：z 图1 原理框图22FSK调制原理2FSK调制就是使用两个不同的频率的载波信号来传输一个二进制信息序列。可以用二进制“1”来对应于载频f1，而“0”用来对应于另一相载频w2的已调波形，而这个可以用受矩形脉冲序列控制的开关电路对两个不同的独立的频率源w1、f2进行选择通。本次课程设计采用的是前面一种方法。如下原理图：图2 调制原理框图32FSK解调原理2FSK的解调方式有两种:相干解调方式和非相干解调方式，本次课程设计采

29、用的是相干解调方式。根据已调信号由两个载波f1、f2调制而成，相干解调先用两个分别对f1、f2带通的滤波器对已调信号进行滤波，然后再分别将滤波后的信号与相应的载波f1、f2相乘进行相干解调，再分别低通滤波、用抽样信号进行抽样判决器即可其原理如下：图3 相干解调原理框图三、 详细设计步骤1信号产生：二进制随机序列和两列频率不等的载波1)利用matlab 库函数产生10个二进制随机数，也就是我们的基波调制信号a。并画出其波形。2)产生两列余弦波tuf1和tuf2，频率分别为f1=20hz,f2=100hz；并画出其波形。2信号调制：产生2FSK信号和加入高斯噪声后的2FSK信号1)用二进制序列a去

30、调制f1和f2，产生2fsk信号，具体做法是用以a生成的方波信号g1a直接与tuf1相乘，用a取反后的方波g2a与tuf2相乘，再将两列信号相加。并画出其波形。2)调用matlab 库函数产生高斯噪声no，并与2fsk信号相加得到加入噪声后的sn信号。并画出其波形。3解调1)对于两列让sn通过两个带通滤波器H1和H2，他们分别以f1和f2为中心频率，并画出经过带通滤波器后的波形。2)对这两列波形分别相干解调乘以与他们同频同相的余弦波tuf1和tff2，画出此时的波形。3)让这两列波形再通过低通滤波器sw1和sw2得到这两列基带调制波形g1a和g2a.画出其波形。4)最后将两列波g1a和g2a通

31、过抽样判决器，画出其波形st，并与之前调制后的波形sn做对比。四、 设计结果及分析1信号产生 波形figure(1) 图4 figure(1) figure(1)分析：第一幅图现实了此时产生的二进制序列是，第二和第三幅图片是频率为20hz的载波tuf1和频率为100hz的载波tuf2的波形。2信号调制波形figure(2)图5 figure(2) figure(2)分析 由于产生的随即序列是，对比上面figure2可以看出，波形较疏的是tuf1，波形较密的是tuf2，上图呈现的序列是：，与调制波相符。3. 信号解调1) 波形figure(3) 图6 figure(3) figure(3)分析：

32、经过带通滤波器之后滤出了频率为f1和f2的载波，从figure(2)和figure(3)的对比可以看出这一步做对了。2) 波形figure(4) 图7 figure(4) figure(4)分析：这是两列信号经过相干解调乘以同频同相的载波之后得到的波形，可以看出figure(4)比figure(3)的波形更密了。3) 波形figure(5)图8 figure(5)figure(5)分析：经过低通滤波器之后，调制信号被滤出来了，第一幅为tuf1，滤波后的序列为：，与之前的调制信号相同。第二幅图为：，与调制信号相反，这是因为在程序中队调制信号取反之后才和tuf2相乘的。4) 波形figure(6)

33、图9 figure(6)figure(6)分析：经过抽样判决之后，恢复出来的基带信号是：，与调制信号一样，从原始波形也可以看出，解调后的波形与调制信号相同。2FSK调制解调实现。4. 课程设计程序：fs=2000; %抽样频率dt=1/fs;f1=20; %定义两列载波的频率f2=100;a=round(rand(1,10); %产生二进制随机序列g1=a;g2=a;g11=(ones(1,2000)*g1; %产生方波信号g1a=g11(:); g21=(ones(1,2000)*g2;g2a=g21(:);t=0:dt:10-dt;t1=length(t);tuf1=cos(2*pi*f1

34、.*t)tuf2=cos(2*pi*f2.*t)subplot(311)n=0:9;x=square(1,50);stem(0:9,a*x);grid;xlabel(二进制随机序列)ylabel(幅度)subplot(312);plot(t,tuf1);title(频率为f1的余弦波)ylabel(幅度)subplot(313);plot(t,tuf2);title(频率为f2的余弦波)ylabel(幅度)figure(2)fsk1=g1a.*tuf1;fsk2=g2a.*tuf2;fsk=fsk1+fsk2;no=0.01*randn(1,t1);%噪声sn=fsk+no;subplot(2

35、11);plot(t,fsk);title(2fsk波形)ylabel(幅度)subplot(212);plot(t,sn);title(加入高斯噪声后的2fsk波形)ylabel(幅度的大小)xlabel(t)figure(3) %FSK解调b1=fir1(101,10/800 20/800);b2=fir1(101,90/800 110/800); %设置带宽参数H1=filter(b1,1,sn); %b1为分子，1为分母，sn为滤波器输入序列H2=filter(b2,1,sn); %噪声信号同时通过两个滤波器subplot(211);plot(t,H1);title(经过带通滤波器H1后的波形) %画出经过H1滤波器后的波形ylabel(幅度);subplot(212);plot(t,H2); %画出经过滤波器二后的波形title(经过带通滤波器H2后的波形)ylabel(幅度)xlabel(t)sw1=H1.*H1;