直接序列扩频接收机对本地载波的同步要求非常严格，以往所需电路复杂。
A direct sequence spread spectrum (DSSS) receiver has strict requirement on local carrier's synchronization, and always needs complex circuits.
文章重点讨论了本地载波解调中的直接数字频率合成器（DDFS）模块的设计。
The design of direct digital frequency synthesizer(DDFS)in the way of local carrier demodulation is mainly introduced.
最后用这些变量调节本地振荡频率，以跟踪载波频率。
Finally, these judged variables adjust the local oscillating frequency to track the carrier frequency by NCO.
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