摘要
在长距离同轴电缆数据传输过程中,由于信号传输的趋附效应及信道带宽的限制,传输基带信号时,高频信号会衰减,从而产生严重的码间干扰,限制信号传输的速度。在不使用复杂电路的情况下,对一种基于时域脉冲宽度调制(PWM)局部预加重技术进行研究,有效提高了信号传输的速度,并以二进制相移键控(BPSK)编码信号为例,通过仿真给出了PWM预加重的最佳位置,并通过眼图观察预加重后的信号传输质量。仿真结果证明,用此方法可有效克服信号的码间干扰问题,大大延长BPSK信号在线缆中的传输距离。
In the process of the coaxial cable of the long-distance data transmission, skin effect of signal transmission and channel bandwidth limits cause attenuation of the high frequency component of the signals during base band signal transmission, therefore produce severe inter-symbol interference and limit the speed of signal transmission. A new technique based on a Local Pulse-Width Modulation （PWM） pre-emphasis method is proposed, and the method can improve the speed of signal transmission without using complex circuit. Simulation results are given which can effectively eliminate the phenomenon of inter-symbol interference and extend the cable transmission distance.
出处
《电视技术》
北大核心
2014年第13期87-90,134,共5页
Video Engineering
基金
国家"863"计划项目(2011AA050526)
