扩频系统中性能最好的是直接序列扩频的先解扩后解调方式。
Direct sequence spread spectrum (DSSS) and despreading first structure is most advantageous of all kinds of spread spectrum techniques.
混沌键控(CSK)按解调方式通常分为相干解调的CSK与非相干解调的CSK。
Chaos Shift Keying (CSK) is generally divided into two categories by demodulation method as coherent detection CSK and non-coherent ones.
接着详细地介绍了北斗卫星的信号体制，对其调制解调方式作了深入地研究，对电文格式作了说明。
After that, the article introduces the signal system as well as modulation and demodulation of Beidou satellite, next, explain the telegram form elaborately.
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