摘要
当大气散射紫外光(UV)信道中的数据速率上升时,码间干扰(ISI)效应将严重影响信道传输效率。文中结合已有实测噪声和脉冲响应实验结果,对UV信道中由延迟扩展引起的ISI效应进行了建模,利用直接序列展频技术(DSSS)来抑制多径传输引起的ISI,进而降低了误码率(BER)并提升了系统的传输性能。通过对误BER与扩频因子、采样频率、数据速率的数值模拟,结果表明:DSSS调制可以有效减少系统的ISI效应,提高高数据率UV通信系统的性能。
When the data rate in atmospheric scattering ultraviolet(UV)channel increases,the inter-symbol interference(ISI)effect will seriously affect the channel transmission efficiency.Based on the experimental results of measured noise and impulse response,the ISI effect caused by delay spread in UV channel is modeled.DSSS is used to suppress the ISI caused by multipath transmission,thereby reducing the BER and improving the transmission performance of the system.Through the numerical simulation of BER,spread spectrum factor,sampling frequency and data rate,the results show that DSSS modulation can effectively reduce the ISI effect of the system and improve the performance of high data rate UV communication system.
作者
刘微雨
LIU Wei-yu(Shaanxi Xueqian Normal University,Xi’an 710100,China)
出处
《信息技术》
2020年第3期109-113,共5页
Information Technology
