The main reason why the SS communication can pick up weak signal in the strong noise environment, is the function of spreading and despreadingspectrum.
扩频通信之所以能实现强噪声环境中弱信号的提取，主要是扩频和解扩的作用。
2
Direct sequence spread spectrum (DSSS) and despreading first structure is most advantageous of all kinds of spread spectrum techniques.
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。
3
In this paper, a blind despreading algorithm is proposed for the synchronous multi-user long-code Direct Sequence spread Spectrum (DS-SS) signals in low signal to Noise Ratio (SNR) scenarios.