It mainly contains the digital modulate system, the SS communication theory and the direct sequence spread spectrum (DSSS) system.

主要是数字调制系统、扩展频谱通信原理和直接序列扩频系统等内容。

youdao

Direct sequence spread spectrum communications is one of the most typical spread spectrum modes.

其中直接序列扩频通信是目前使用最典型的扩频工作方式。

youdao

The performance of Direct Sequence Spread Spectrum(DSSS) in severe pulsed noise interference will be badly degraded when the duty factor is small.

当脉冲干扰占空比较小时，干扰能量集中，导致直接序列扩频（DSSS）系统的误码性能较差。

youdao

Main.net uses a related technology called direct sequence spread spectrum, or DSSS, to send its signals down the power line.

FORBES: Technology