摘要
对室内可见光通信系统(VLC)常用的单光源信道模型作出改进,提出一个环绕圆-角阵列的新型LED分布方案,使多用户在不同位置的信噪比差异降低90%,并构建具有反射链路的信道模型.提出采用RMS时延扩展方法分析新方案的多径延迟,利用迫零信道均衡(ZFE)降低码间串扰(ISI)程度.研究表明,新方案使SNR的位置分布更均匀,在考虑反射链路模型中,经信道均衡后达到接近无ISI的理想误码率(BER)性能.该分布方案及其复杂信道模型能满足多用户VLC需求,具有实际应用价值.
By analyzing the indoor Visible Light Communication system commonly used LEDs illuminationradiation,this paper investigates a circle-corners compensated distribution scheme of the LEDs.Our studies showthat the the SNR fluctuation under such an arrangement can reduced90%which guarantees that users can obtainalmost identical communication quality within better entire light intensity distribution.We use Root-Mean-Squaredelay spread to simulate the multipath delay which has reflections,then we investigate a more realistic channelmodel using Zero Forcing Equalization.Although the distribution scheme increasing the inter-symbolinterference(ISI),the bit error rate(BER)is also very close to that channel without any ISI in the system.Thescheme and the channel model reflect the actual needs of multi-user in VLC which has broad prospects forapplication.
作者
曾碧
洪国南
Zeng Bi;Hong Guo-nan(School of Computer Science, Guangdong University of Technology, Guangzhou 510006, China)
出处
《广东工业大学学报》
CAS
2017年第1期71-77,共7页
Journal of Guangdong University of Technology
基金
国家基金广东省联合基金重点资助项目(U1201251)
广东省产学研合作专项项目(2014B090904080)
关键词
可见光通信系统
信道模型
码间串扰
误码率
信道均衡
visible light communication system
channel model
inter symbol interference
bit error rate
channel equalization
