CDMA2000码序列(短码、长码WALSH码

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1、教学目标掌握CDMA2000中使用的三种码字的作用了解WALSH码和PN码是如何产生的掌握WALSH码和PN码的特点1教学重点掌握CMDA2000中使用的三种码字的作用掌握WALSH码和PN码的特点2教学难点WALSH码和PN码是如何产生的WALSH码和PN码的特点3一、walsh码字及相关性的概念二、PN码字的产生及作用4一、walsh码字及相关性的概念CDMA2000扩频码的选择Walsh码的定义Walsh码的产生相关性正交函数Walsh码在CDMA中的应用5扩频码速率：1.2288Mcps；扩频码：前向为Walsh

2、码和PN短码，反向为PN长码。扩频码的使用是扩频通信的关键点CDMA2000扩频码的选择6Walsh码的定义Walsh码的定义Walsh函数是一种非正弦波的完备正交函数系统，可用哈达玛矩阵H通过递推关系构成。由于它仅有可能的取值是＋1和－1（或0和1），比较适合于用来表达和处理数字信号。Walsh函数具有理想的互相关特性。在Walsh函数中，两两之间的互相关函数为“0”，亦即它们之间是正交的。7WALSHCODES#----------------------------------64-ChipSequence----

3、--------------------------------------000000000000000000000000000000000000000000000000000000000000000001010101010101010101010101010101010101010101010101010101010101010120011001100110011001100110011001100110011001100110011001100110011301100110011001100110011001100

4、11001100110011001100110011001100110400001111000011110000111100001111000011110000111100001111000011115010110100101101001011010010110100101101001011010010110100101101060011110000111100001111000011110000111100001111000011110000111100701101001011010010110100101101001

5、01101001011010010110100101101001800000000111111110000000011111111000000001111111100000000111111119010101011010101001010101101010100101010110101010010101011010101010001100111100110000110011110011000011001111001100001100111100110011011001101001100101100110100110010

6、11001101001100101100110100110011200001111111100000000111111110000000011111111000000001111111100001301011010101001010101101010100101010110101010010101011010101001011400111100110000110011110011000011001111001100001100111100110000111501101001100101100110100110010110

7、01101001100101100110100110010110160000000000000000111111111111111100000000000000001111111111111111170101010101010101101010101010101001010101010101011010101010101010180011001100110011110011001100110000110011001100111100110011001100190110011001100110100110011001100

8、101100110011001101001100110011001200000111100001111111100001111000000001111000011111111000011110000210101101001011010101001011010010101011010010110101010010110