摘要
提高通信信号的频谱利用率是通信理论研究的一个重要课题,传统方式采用多进制调制来提高每波特码元包含的信息量,而超窄带通信则是通过减小信号带宽来达到该目的。与现有的超窄带通信理论立足于设计频谱能量集中的调制波形不同,通过对传统基带信号进行理想低通滤波,产生理想带限的超窄带信号,再基于线性方程组求解的方法对信号进行解调,从而实现超窄带通信。该方法产生的超窄带信号是理想带通信号,能够达到较高的频率利用率,但是要求足够高的信噪比才能够应用。
To improve the communication signal spectrum efficiency is an important topic of research in communication theory. Traditional methods axe based on the M-ary modulation to increase the amount of information contained in each symbol, while ultra-narrow-band communication is achieved by reducing the signal bandwidth. Different from the existing narrowband communication theory based on the design of the modulation waveform, a new narrowband communication theory is proposed in this paper, which makes the traditional base- band signal pass through the ideal low-pass filter, and creates an ideal band-limited naxrowband signal And then the linear equations axe solved to demodulate the signal, so the ultra-narrow-band commtmication is achieved. The ultra-narrow-band signal is ideal band-limited to improve spectrum efficiency, but the new system requires high signal-to-noise ratio.
出处
《中国科技论文》
CAS
北大核心
2013年第7期595-598,共4页
China Sciencepaper
基金
中央高校基本科研业务费专项资金资助项目(2013QN143)
关键词
通信与信息系统
超窄带通信
理想带限信号
方程组求解
communication and information system
ultra-narrow-band communication
ideal band-limited signal
solution of line-ar equations
