This chapter is a base of next chapter . mathematics theory and pseudo stochastic code theory for spread spectrum modulation sequence are introduced , and simulink experiment and analysis about correlation performance of the most common use spectrum modulation sequence are processed , these experiment contact to performance parameters of the spread spectrum sequence . the correlation performance and address quantity are compared between m sequence and gold sequence 本章是第五章的理论基础，介绍了扩频调制序列的数理基础和伪随机码理论，同时联系调制序列的性能指标对最常用的两种扩频调制序列的相关性能进行了仿真研究和分析讨论，比较了m序列和gold序列互相关特性和地址数。
Since 1997 , a special class , namely , the basic science class , has been in operation in the school of science , every year accepting 50 entering undergraduate students having high enthusiasm in science . these students take intensive courses in science and mathematics throughout the 4 years as undergraduates in tsinghua 1997年以来，学校还举办理科本科生“基础科学班” ，每年从全国高考生和校内刚入学的非理科本科新生中招收50名左右对理科特别有兴趣的学子，实施强化数理基础的专项教学计划，培养有志献身数学和自然科学事业的优秀人才。
