摘要
采用直接序列扩频技术,使通信信号具有频谱可控的特征,实现认知用户与授权用户共存的通信系统,可较好地解决目前频谱利用率低的问题。在信道带宽内空闲频段较少的情况下,采用码位移技术,可实现以更多的具有不同频谱特征的序列进行多进制传输。
The technology of DSSS(Direct Sequence Spread Spectrum)realize the signal spectrum features what can be controlled the coexistence between cognitive users and authorized users, and improve the spectrum utilization. In the cases of less idle frequencies band, using CSK(Code Shift Keying) can achieve different spectrum sequences for M-ary transfers.
出处
《自动化技术与应用》
2013年第4期32-35,共4页
Techniques of Automation and Applications
关键词
认知无线电
直接序列扩频
码位移
复合序列
cognitive radio
direct sequence spread spectrum
code displacement
composite sequence