计算机网络cdma编码实验,计算机网络CDMA练习题(Computer network CDMA exercises).doc...

计算机网络CDMA练习题(Computer network CDMA exercises)

计算机网络CDMA练习题(Computer network CDMA exercises)

The first chapter

What are the three main standards of 3G?

The second chapter

2.1 explain how the code division multiple access works?

2.2 what are the three key technologies of cdma?

2.3 why must the code division be combined with spread spectrum technology?

The system wants to transmit C = 64kbit/s data, the signal noise ratio s/N = 15dB, what is the theoretical channel bandwidth? What is the channel bandwidth if the signal-to-noise ratio is equal to -10db?

2.5 a spread spectrum communication system of the spread spectrum signal bandwidth W and information is W = 20 MHZ bandwidth B, B = 10 KHZ, such as system loss LS = 3 db, the receiver output letter receiver output signal-to-noise ratio (S/N) > = 10 db, then the system of spread spectrum gain and interference tolerance is how much?

11 what is spread spectrum gain? What is its physical significance?

What are the interference tolerance? What does the system's interference tolerance mean?

What are the characteristics of the spread-spectrum communication system?

What is direct sequence spread spectrum communication? What is the anti-interference mechanism of direct sequence ampliation communication?

16. How does direct sequence spread spectrum communication combine with multi-address?

17 what is frequency hopping? How does frequency-hopping spread spectrum communication system make up?

Why is the frequency amplifable communication system resistant to interference?

Chapter iii code sequence

What characteristics should the ideal address code and spread code have?

What is the two Walsh? How is it generated?

Why can't the Walsh code be used as a spread code?

Try to write the walshard matrix of 8.

5 what is m sequence? How is it generated?

6. What is the period of the m sequence generated by the 4-step shift register? How many m sequences are there?

There is an m sequence that generates a polynomial of G4 (x) = 1 + x1 + x4, and try to draw the corresponding generation circuit

网上的有关这个实验课的代码都写得不正确,我特意整理了一份,直接可以运行的代码,注释详细,输出人性化看得懂 实验CDMA编码 1、实验题目:CDMA编码 2、实验内容: (1) 设全部8比特二进制数集合为M。随机生成8比特码片m1。 (2) 计算与m1正交的所有8比特码片集合M1。 (3) 在集合M-M1中随机选取码片m2。 (4) 计算与m2正交的所有8比特码片M2 (5) 以此类推,计算出所有8比特互相正交的码片集合M1、M2、…… 3、实验报告内容: (1) CDMA信道复用原理。 (2) 随机生成的的5个互不正交的码片M1、M2、M3、M4、M5。 (3) 获取与某个码片正交的全部码片的算法。 (4) 记录与M1正交的码片数量及10个与M1正交的码片,不足10个的记录全部码片,互为反码的记为一个。 (5) 记录与M2正交的码片数量及10个与M2正交的码片,不足10个的记录全部码片,互为反码的记为一个。 (6) 记录与M3正交的码片数量及10个与M3正交的码片,不足10个的记录全部码片,互为反码的记为一个。 (7) 记录与M4正交的码片数量及10个与M4正交的码片,不足10个的记录全部码片,互为反码的记为一个。 (8) 记录与M5正交的码片数量及10个与M5正交的码片,不足10个的记录全部码片,互为反码的记为一个。 (9) 比较与M1、M2、M3、M4、M5正交的码片总数并简单分析原因。
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