摘要
针对频率资源有限,通信数据业务所需带宽不断增大造成的频率资源短缺现象。本文以超窄带调制技术EBPSK为研究对象,建立了EBPSK功率谱密度的数学模型。对EBPSK已调信号的PSD曲线进行仿真,分析了调制角度和跳变持续时间等调制参数对已调信号PSD性能的影响,以及在特定带宽下EBPSK的能量百分比。同时,研究EBPSK信号频谱利用率与信号相关性、衰减频带和误码率的关系,以正确选择EBPSK信号带宽,使系统性能最优。研究结果表明:EBPSK信号能量高度集中在中心频率周围,理论上可以实现超窄带通信,频谱利用率较高。
Due to the frequency resource is limited,the bandwidth required by communication data services is continuously increased,it causes resource shortage of frequency.The ultra narrow band modulation technology EBPSK was as a studying target,the mathematical model of EBPSK power spectral density was established in this paper.Simulated PSD curve of the EBPSK signal,the impact of modulation parameters on the performance of PSD signal was analysised,which include modulation phase and phase jump duration,and the percentage of energy of EBPSK signal in specified bandwidth.Meanwhile,the relationship between the EBPSK signal spectrum utilization and the signal correlation,attenuation band and the error rate was researched to choice EBPSK signal bandwidth,it makes the system performance best.The results showed that the energy of EBPSK signal is highly concentrated in the center frequency,it can realize the ultra narrowband communication and high spectrum utilization.
出处
《现代科学仪器》
2013年第4期153-159,共7页
Modern Scientific Instruments
关键词
超窄带调制
EBPSK
PSD
频谱利用率
Ultra narrow bandwidth modulation
Extended BPSK
Power spectral density
Spectrum utilization
