摘要
基于接收信号强度估算定位距离时发光二极管之间发生功率的叠加——多址干扰问题,对码分多址技术与三边测量相结合的室内可见光定位所固有的多址干扰对可见光定位精度的影响进行深入分析。信号到达接收端的时间非同步,导致多址干扰不能完全消除从而引入定位误差。评估了walsh序列、m序列、gold序列引入的多址干扰对定位误差的影响以及不同的扩频比、发射功率对定位误差的影响。仿真实验表明,考虑接收信号的时间差情况,gold序列作为扩频码的定位效果更好,随着扩频比的增大,定位精度越来越好,当扩频比为1023时,gold序列的平均定位精度可达到0.0392m。
Based on the received signal strength estimated when positioning the distance between the light emitting diode overlap-multiple access interference problem,the combination of code division multiple access technology and the three sides of the indoor visible light positioning of the inherent multiple access interference of visible light positioning accuracy do a in-depth analysis.The signal arrives at the receiving end of the time asynchronous,leading to multiple access interference can not be completely eliminated to introduce positioning error.The effects of multiple access interference introduced by walsh sequence,m sequence and gold sequence on positioning errors and the influence of different spreading ratio and transmission power on positioning error were evaluated.The simulation results show that,considering the time difference of the received signal,the gold sequence is better positioned as the spreading code. As the spreading ratio increases,the positioning accuracy becomes better and better.When the spreading ratio is 1023,the gold sequence of average positioning accuracy can reach 0. 0392 m.
作者
张春艳
邵建华
聂帅
郭琛
ZHANG Chunyan;SHAO Jianhua;NIE Shuai;GUO Chen(School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China)
出处
《激光杂志》
北大核心
2018年第8期50-54,共5页
Laser Journal
基金
教育部博士点基金资助课题(No.2013102SBJ0265)
关键词
可见光定位
多址干扰
码分多址
噪声
visible light positioning
muhiple access interference
code division muhiple access
noise
