Note 为达到特殊的目的，带宽利用是可用带宽的 合理使用. 复用(multiplexing)可获得效率，扩频 (spreading)可以到保密与抗干扰 Efficiency can be achieved by multiplexing;privacy and anti-jamming can be achieved by spreading. 6.2 6.2 为达到特殊的目的，带宽利用是可用带宽的 合理使用. 复用(multiplexing)可获得效率，扩频 (spreading)可以到保密与抗干扰 Efficiency can be achieved by multiplexing; privacy and anti-jamming can be achieved by spreading. Note