摘要
在单次散射条件下,研究了非视线紫外光散射通信系统的信道特性。分析了传输损耗与光源发散角、接收视场和收发仰角等系统几何参数之间的关系,结果表明传输损耗随收发仰角的增大而增大,增加接收视场可以降低损耗;针对两种不同情况讨论了损耗随光源发散角的变化关系,发现发散角对损耗的影响较小,可根据应用场合适当确定.研究了信道的多径传输现象及其对系统性能的影响,结果表明多径传输引起的脉冲展宽将导致码间干扰的产生,限制系统的通信速率,并定量讨论了 NRZ 码和 RZ 码两种情况下码间干扰的影响,发现相对于 NRZ 码,采用 RZ 码可以有效地减轻码间干扰,获得更高的通信速率.
Based on the assumption of single-scattering,the channel properties of non-line-of-sight(NLOS)UV communication systems are studied.Correlations between path loss and parameters of system,including source divergence angle,receiver field of view,and apex angles of transmitter and receiver in an UV scattering communication system,are analyzed.Moreover,multipath propagation is investigated,and expressions for impulse response and intersymbol interference-induced digital signal-to-noise ratio penalty of NLOS UV communications are introduced.The results suggest that parameters of system should be designed according to specified situation,and RZ format is more suitable for the UV scattering communications than NRZ format.
出处
《红外与激光工程》
EI
CSCD
北大核心
2006年第z2期226-230,共5页
Infrared and Laser Engineering
关键词
光散射通信
紫外
非视线
损耗
多径传输
Optical scattering communication
UV
Non-line-of-sight
Path loss
Multipath propagation
