摘要
针对室内可见光通信链路性能提高问题,提出了一种适用于室内可见光通信的高效混合调制方案。该混合调制方案通过将频谱高效的多维无载波幅度相位(CAP)调制与功率高效的多脉冲位置调制(MPPM)相结合,利用MPPM的不同脉冲时隙信息控制CAP信号的传输。基于Lambertian光照模型,推导了高斯信道下N维DCO(DC offset)-CAP-MPPM方案的误码率(SER)解析表达式,仿真验证了其准确性。此外,对比分析了该混合调制方案与传统MPPM及多维DCO-CAP方案的性能优劣。通过数值仿真,分析了脉冲占比、调制阶数以及CAP维度等参数对混合调制方案误码性能的影响,仿真结果表明,混合多维DCO-CAP-MPPM方案在可以提供灵活的多址接入功能基础上,通过选择合适参数,可以得到优于传统MPPM或CAP调制的误码性能。
In this study,an efficient hybrid modulation scheme suitable for indoor visible light communication is proposed to improve the performance of the indoor visible light communication links.The multi-dimensional carrierless amplitude and phase(CAP)modulation technique exhibiting high spectral efficiency and the multi-pulse position modulation(MPPM)technique exhibiting high power efficiency are combined in the proposed hybrid modulation scheme.The transmission intervals of the CAP signals are controlled by the different pulse time slots of MPPM.Based on Lambertian illumination model,the theoretical symbol error rate(SER)expression of the multi-dimensional DCO(DC offset)-CAP-MPPM scheme over the Gaussian channel is derived and verified via simulation.In addition,the performances of the proposed,ordinary MPPM and multi-dimensional DCO-CAP schemes are comparatively analyzed.The numerical results denote that the SER performance of hybrid modulation is related to its pulse ratio,modulation level,and CAP dimensions.Flexible multiple access can be achieved using multi-dimensional DCO-CAP-MPPM modulation.The SER performance of the hybrid scheme is better than those of the ordinary MPPM and CAP mudulation obtained using appropriately selected parameters.
作者
王旭东
刘莹
吴楠
林彬
Wang Xudong;Liu Ying;Wu Nan;Lin Bin(Information Science Technology College,Dalian Maritime University,Dalian,Liaoning 116026,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2020年第6期256-268,共13页
Chinese Journal of Lasers
基金
国家自然科学基金(61371091,61971083)
大连科技创新基金(2019J11CY015)。
关键词
光通信
可见光通信
无载波幅度相位调制
多脉冲位置调制
误码率
optical communications
visible light communication
carrierless amplitude and phase modulation
multi-pulse position modulation
symbol error rate
