在Matlab下实现直扩仿真。九阶扩频序列。相关解扩。(Implementation of direct spread simulation under Matlab. Nine order spread spectrum sequence. Correlation despreading.)

差分能量检测直扩程序，直扩的基础上加了差分编码和能量检测，而不是相关检测。(Differential energy detection DSSS, based on DSSS, adds differential encoding and energy detection instead of correlation detection.)