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随着通信技术的发展,频谱资源日趋紧张.超窄带通信体制的出现极大地提高了系统频谱利用率,但需借助于特殊的超窄带滤波器方能实现.然而超窄带滤波理论并未获得学术界的一致认同,其实现也难以验证.本文提出了一种新的超窄带调制方式–随机脉冲位置键控(random pulse position keying,RPPK),通过对其功率谱分析发现,RPPK调制信号功率谱中基本不含多余离散谱线,避免了超窄带滤波器的使用.因此,RPPK理论更为清晰,实现更加简单.仿真和分析表明,RPPK频谱利用率可高达100bit/s/Hz;当接收端采用最佳接收时,其性能与BPSK相近,优于其余的超窄带调制方式;同时,RPPK亦能提供用户多址接入和通信保密性.
With the development of communication technology, the spectrum resources are becoming more and more nervous.The emergence of ultra-narrowband communication system has greatly improved the system spectrum utilization, but it needs special ultra-narrow band filter to achieve.However, the theory of ultra-narrowband filter has not obtained academic It is difficult to verify its realization.A new type of ultra-narrowband modulation, called random pulse position keying (RPPK), is proposed in this paper. Power spectrum analysis shows that the power spectrum of RPPK modulated signal So the RPPK theory is clearer and easier to implement.The simulation and analysis show that the utilization rate of RPPK spectrum can be as high as 100 bit / s / Hz. When the receiver The best receiver, its performance and BPSK similar to better than the rest of the ultra-narrowband modulation; the same time, RPPK also provides users with multiple access and communication confidentiality.