室内可见光通信频域均衡技术DSP方法对比分析

Comparison studies of DSP schemes with frequency domain equalization for visible light communication

对3种室内可见光通信传输技术的数字信号处理方法(DSP),包括正交频分复用(OFDM)、单载波频域均衡(SCFDE)与单载波频分复用(SCFDM)进行了对比分析.通过峰值功率比(PAPR)和计算复杂度比较了3种方法的优劣.分析结果表明,SCFDE和SCFDM具有较低的PAPR,但SCFDM计算复杂度较高.此外,还使用白光LED灯针对3种调制解调方法建立了实验模型.实验结果表明,在VLC传输系统中,由于低PAPR特性,使得SCFDE和SCFDM在误码率(BER)和Q值方面的性能优于OFDM.

In this paper, we investigate and compare the performance of three digital signal processing （DSP） based transmission technologies for indoor visible light communication （VLC）. These schemes include orthogonal frequency division multiplexing （OFDM）, single carrier frequency domain equalization （SCFDE）, and singlecarrier frequency division multiplexing （SCFDM）. Particularly, we analyze their peak-to-average power ratio （PA- PR） and computational complexity for comparison.Our results indicate that SCFDE and SCFDM system have rela- tively low PAPR while SCFDM has the highest complexity. Besides, we present a hardware prototype for the three modulation methods using a white LED lamp. Experimental results show that, due to their low PAPR, SCFDE and SCFDM outperform OFDM in aspects of bit error rate （BER） and Q factor performances in VLC transmission.