可见光并行高速通信交织分多址技术研究

Interleave-Division Multiple-Access for High-Speed Visible Light Communication in Parallel

商用发光二极管(LED)调制带宽受限制约着可见光通信的传输速率,而灯具内通常有多个LED灯芯,为此提出了通过多个灯芯同时作为通信信源,利用交织分多址技术并行叠加,单一光电检测器(PD)接收的高速传输方案。由于LED驱动电压非负、PD只检测光强信息,为此提出了基于单载波开关键控(OOK)调制的发送传输结构、接收端多LED检测和重复码译码算法;研究了可见光OOK调制的信噪比(SNR)性能估计算法;仿真中,与等条件的多载波直流(DC)偏置光正交频分复用相比较,该方案在误码率(BER)、抗非线性等性能上更优。

The transmission rate of the commercial light emitting diode is limited by modulation bandwidth in visible light communication. While there are more than one light emitting diode （LED） wicks in a lamp, so a high-speed transmission system scheme that the multi-LED wicks transmit data in a single lamp simultaneously, which utilizes the interleave-division multiple-access technology to superimpose mode in parallel and uses a single photodiode to receive data, is designed. As the driving voltage of LED is non-negative and photoelectric detector （PD） only detects the light intensity information, the transmitter structure, the receiver detection algorithm of multi-LED wicks and the decoding algorithm of repetition code based on single carrier on-off keying （OOK） modulation are proposed. And the signal noise ratio （SNR） performance evaluation algorithm based on OOK modulation is researched. Finally, compared with the multi-carrier direct current （DC）-biased optical orthogonal frequency division multiplexing under the same conditions in the simulation, the proposed scheme is more superior in the performance of anti-nonlinearity and bit error ratio （BER）.