针对低压电力线的噪声影响数据通信的问题,在分析了低压电力线的噪声特性和频谱特征的基础上,提出采用240 k Hz为载波中心频率,传输速率9600 bps的BFSK调制方式,给出了BFSK解调算法,分析了BFSK接收性能。仿真和实测结果表明,在信噪比-10...针对低压电力线的噪声影响数据通信的问题,在分析了低压电力线的噪声特性和频谱特征的基础上,提出采用240 k Hz为载波中心频率,传输速率9600 bps的BFSK调制方式,给出了BFSK解调算法,分析了BFSK接收性能。仿真和实测结果表明,在信噪比-10 d B时,设计的BFSK调制解调器的误码率约为0.3%。展开更多
理论推导了等概率二元码判决时误码率和判决电平的关系,推导表明误码率随着判决门限偏离最佳值急剧升高,因而提出了一种新颖的自适应判决电路,可以使判决门限跟随被判决信号的变化自动调整到最佳值.电路采用SM IC 0.35μm CM O S工艺设...理论推导了等概率二元码判决时误码率和判决电平的关系,推导表明误码率随着判决门限偏离最佳值急剧升高,因而提出了一种新颖的自适应判决电路,可以使判决门限跟随被判决信号的变化自动调整到最佳值.电路采用SM IC 0.35μm CM O S工艺设计,并给出了芯片针对于27MH z无线FSK信号的接收判决这一具体应用的测试结果.展开更多
A novel method to generate binary frequency shift-keying(BFSK) radio frequency(RF) signals in optical domain is proposed.In the proposed system,an optical short pulse train is converted into super-Gaussian RF pulses w...A novel method to generate binary frequency shift-keying(BFSK) radio frequency(RF) signals in optical domain is proposed.In the proposed system,an optical short pulse train is converted into super-Gaussian RF pulses with high frequency based on optical pulse shaping by two Mach-Zehnder fiber interferometers(MZIs).And the generated RF signals are coded using a fast electro-optic switch.By properly designing the MZIs,BFSK RF signals with desired code pattern and modulation index can be generated.A theoretical model for describing the system is developed,and the generation of BFSK RF signals in millimeter-wave regime is demonstrated via simulations.展开更多
文摘针对低压电力线的噪声影响数据通信的问题,在分析了低压电力线的噪声特性和频谱特征的基础上,提出采用240 k Hz为载波中心频率,传输速率9600 bps的BFSK调制方式,给出了BFSK解调算法,分析了BFSK接收性能。仿真和实测结果表明,在信噪比-10 d B时,设计的BFSK调制解调器的误码率约为0.3%。
文摘理论推导了等概率二元码判决时误码率和判决电平的关系,推导表明误码率随着判决门限偏离最佳值急剧升高,因而提出了一种新颖的自适应判决电路,可以使判决门限跟随被判决信号的变化自动调整到最佳值.电路采用SM IC 0.35μm CM O S工艺设计,并给出了芯片针对于27MH z无线FSK信号的接收判决这一具体应用的测试结果.
基金supported by the National Natural Science Foundation of China (No. 61032005)the Postdoctoral Science Foundation under Grant of China (No.2012M510442)
文摘A novel method to generate binary frequency shift-keying(BFSK) radio frequency(RF) signals in optical domain is proposed.In the proposed system,an optical short pulse train is converted into super-Gaussian RF pulses with high frequency based on optical pulse shaping by two Mach-Zehnder fiber interferometers(MZIs).And the generated RF signals are coded using a fast electro-optic switch.By properly designing the MZIs,BFSK RF signals with desired code pattern and modulation index can be generated.A theoretical model for describing the system is developed,and the generation of BFSK RF signals in millimeter-wave regime is demonstrated via simulations.
