Block-Based PAM with Frequency Domain Equalization in Visible Light Communications

被引：0
|
作者：
Grobe, Liane [1 ]
Langer, Klaus-Dieter [1 ]
机构：
[1] Heinrich Hertz Inst Nachrichtentech Berlin GmbH, Fraunhofer Inst Telecommun, D-10587 Berlin, Germany
来源：
2013 IEEE GLOBECOM WORKSHOPS (GC WKSHPS) | 2013年
关键词：
optical wireless communications (OWC); visible light communications (VLC); light emitting diode (LED); pulse amplitude modulation (PAM); frequency domain equalization (FDE);
D O I：
暂无
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
In this paper, we analyze block-based pulse amplitude modulation with frequency domain equalization (block-based PAM-FDE) for visible light communications (VLC) in realistic application scenarios. Typical effects of the VLC-channel, such as different frequency responses of the LED together with the wireless optical propagation channel are included. We consider a measured LED response from our experimental system reaching a noticeable extended 3 dB cutoff freqeuncy of 6 0 MHz. Further simulations are then based on a 6 0 MHz low-pass approximation. To consider multipath propagation, two common models for diffuse and non-directed line-of-sight (LOS) conditions are used. We illustrate the influence of the transmitter and propagation characteristics and observe in general significant gains by using a higher system bandwidth while the modulation order is increased only if the received power is very high. We show that in a mobile scenario with variable receiving power, depending on the availability and strength of the LOS-path, optimization of both the symbol rate and the modulation format will be the key parameters enabling efficient and reliable highspeed transmission using block-based PAM-FDE.
引用
收藏
页码：1070 / 1075
页数：6
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