A Comparative Performance Assessment between Pre-equalization and Post-equalization Techniques in m-CAP Indoor VLC Systems with Bit Loading
سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 650
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شناسه ملی سند علمی:
WACOWC01_005
تاریخ نمایه سازی: 11 شهریور 1397
چکیده مقاله:
This paper demonstrates the superiority of zero-forcing (ZF) pre-equalizer over post-equalizer for the multi-band carrierless amplitude and phase (m-CAP) modulation cheme in the visible light communications (VLC) system. The VLC channel is generated based on iterative site-based modeling for a medium sized room. For the LED bandwidth of 3.5 MHz and different number of subcarriers m = {1, 2, 5} we show the bit error rate (BER) and the error vector magnitude (EVM) of m-CAP with ZF pre- and post-equalizer for a system bandwidth of 15 MHz. Results show that, a BER of 10-4 can be achieved for the pre-equalized m-CAP system, which is well below the 7% forward error correction(FEC) BER limit of 3.8×10-3.
کلیدواژه ها:
Visible light communications ، Multi-band carrierless amplitude and phase modulation ، ZF pre-equalizer ، ZF postequalizer ، Iterative site-based method ، Bit loading
نویسندگان
Mahdi Nassiri
Department of Electrical Engineering, University of Guilan, Rasht, Iran
Saeed Ashouri
Department of Electrical Engineering, University of Guilan, Rasht, Iran
Gholamreza Baghersalimi
Department of Electrical Engineering, University of Guilan, Rasht, Iran
Zabih Ghassemlooy
Optical Communications Research Group, Faculty of Engineering and Environment, Northumbria University, Newcastle, UK