8 June 2017 White LED-based optical wireless link with improved transmission capacity using nonorthogonal multiamplitude phase frequency modulation
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Abstract
A nonorthogonal amplitude, phase, and frequency modulation (APFM) technique that can increase the transmission capacity of an optical wireless link based on white light-emitting diode (LED) is proposed. It is implemented by the simultaneous use of nonorthogonal frequency shift keying (FSK) and quadrature amplitude modulation (QAM). A white LED-based wireless link using a 64-APFM scheme is constructed to experimentally verify the proposed technique, where the 64-APFM scheme is implemented by the combination of nonorthogonal 4-FSK and 16-QAM. Two more bits per symbol are transmitted using the proposed scheme with the same bandwidth of QAM. No intercarrier interference effect is observed at the 0.02-% frequency spacing (0.001 MHz) for the used RF carrier (5 MHz) because the correlation between the received 64-APFM signal and only one carrier at a time is accomplished with the help of digital signal processing. 6 - Mbit / s ( 1 - Msymbol / s ) data are successfully transmitted through an optical wireless channel with a limited bandwidth of 1 MHz. This indicates that six bits per symbol can be transmitted using the proposed APFM technique at the same physical bandwidth as 16-QAM.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yong-Yuk Won, Sang Min Yoon, Dongsun Seo, "White LED-based optical wireless link with improved transmission capacity using nonorthogonal multiamplitude phase frequency modulation," Optical Engineering 56(6), 066103 (8 June 2017). https://doi.org/10.1117/1.OE.56.6.066103 . Submission: Received: 27 December 2016; Accepted: 22 May 2017
Received: 27 December 2016; Accepted: 22 May 2017; Published: 8 June 2017
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