CAJ | 학술논문

利用单个照明灯具内多个LED灯芯，在不同驱动电压条件同时并行发送不同数据，经过可见光信道叠加传输数据后，接收端由单一PD检测汇聚的多路光强信号，再按照各个灯芯驱动电压差异检测恢复出各个灯芯的数据，从而实现数据成倍的高速传输。针对叠加传输中LED驱动电压非负特性，提出了基于开关键控OOK调制的接收端检测算法，在此基础上提出了针对LED电光转换非线性的信噪比演进和规划的联合功率分配方案。仿真表明该方案在牺牲一定信噪比的条件下使叠加高速通信中LED的驱动电压工作在线性范围内，并且获得和未规划时相同的误比特率性能；与低码率的多灯芯恒定驱动电压方案相比，该方案传输效率更高。
이용단개조명등구내다개LED등심，재불동구동전압조건동시병행발송불동수거，경과가견광신도첩가전수수거후，접수단유단일PD검측회취적다로광강신호，재안조각개등심구동전압차이검측회복출각개등심적수거，종이실현수거성배적고속전수。침대첩가전수중LED구동전압비부특성，제출료기우개관건공OOK조제적접수단검측산법，재차기출상제출료침대LED전광전환비선성적신조비연진화규화적연합공솔분배방안。방진표명해방안재희생일정신조비적조건하사첩가고속통신중LED적구동전압공작재선성범위내，병차획득화미규화시상동적오비특솔성능；여저마솔적다등심항정구동전압방안상비，해방안전수효솔경고。
Multiple LED wicks are used in a single lamp to send disparate data under different driving voltages at the same time.At the receiver,a single photodiode(PD)is used to detect the convergence light intensity signals after superpo-sition transmission in visible light channel.Finally,data can be detected and separated by the divergence of driving volta-ges.Thus the data rate that is multiple times of a single LED wick can be realized.Due to the nonnegative characteristics of LED driving voltage,the detecting algorithm of the receiver based on on-off keying (OOK)modulation is proposed. Meanwhile,joint power allocation scheme of the Signal to noise ratio(SNR)evolution and programing for the electro-optical conversion nonlinearity of LED are proposed.The simulation shows that sacrifice in SNR could make LED work within the linear range of superposition high-speed communication.And the system could achieve the same bit error rate(BER)per-formance as the un-programming scheme.Comparing with the low-rate scheme under the constant driving voltage of multiple LED wicks,the proposed scheme is more efficient.