主要有两种选择，直接序列扩频和跳频扩频。
There are two main alternatives, Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum.
直接序列扩频通过扩展干扰频谱降低有效干扰功率进行抗干扰，跳频则主要是通过频点跳变的方式躲避干扰。
DSSS system combats the jamming by reducing the effective power of jamming, and FH system does through the frequency hopping to avoid jamming.
在扩频通信技术中，直接序列扩频和跳频是应用最广的两种扩频技术。
In the spread spectrum communication, direct sequence spread spectrum (DSSS) and frequency hopping (FH) are the two kinds of most widely used spread spectrum technologies.
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