Experimental demonstration of an adaptive orthogonal frequency division multiplexing visible light communication system

Xinyue Guo; Xin Li

doi:10.3788/COL201614.110604

Journals >Chinese Optics Letters >Volume 14 >Issue 11 >Page 110604 > Article

Chinese Optics Letters
Vol. 14, Issue 11, 110604 (2016)

Experimental demonstration of an adaptive orthogonal frequency division multiplexing visible light communication system

Xinyue Guo^* and Xin Li

Author Affiliations

Shanghai Key Lab of Modern Optical Systems, School of Optical-Electrical and Computing Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

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DOI: 10.3788/COL201614.110604 Cite this Article Set citation alerts

Xinyue Guo, Xin Li. Experimental demonstration of an adaptive orthogonal frequency division multiplexing visible light communication system[J]. Chinese Optics Letters, 2016, 14(11): 110604 Copy Citation Text

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Abstract

We propose and experimentally demonstrate a simple visible light communication system by combining an adaptive transmission technique with orthogonal frequency division multiplexing. In the adaptive transmission scheme, power allocation is performed in such a way as to maximize the channel capacity under electric power constraints, and adaptive modulation is then introduced to achieve the maximum data rate given a target bit error rate. Experimental results show that spectrum efficiency can be greatly improved through this adaptive transmission technique.

\max_{P (1) \dots P (N)} \sum_{k = 1}^{N} C (k) = \sum_{k = 1}^{N} \log (1 + \frac{{| H (k) |}^{2} P (k)}{N_{0}}),

(1)

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\sum_{k = 1}^{N} P (k) = N P (k) \geq 0 k = 1, \dots, N,

(2)

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P (k) = {(\frac{1}{λ} - \frac{N_{0}}{{| H (k) |}^{2}})}^{+} = {\begin{cases} \frac{1}{λ} - \frac{N_{0}}{{| H (k) |}^{2}}, & if \frac{1}{λ} - \frac{N_{0}}{{| H (k) |}^{2}} \geq 0 \\ 0, & otherwise \end{cases},

(3)

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BER \leq 0.2 \exp (- 1.5 \frac{γ}{M - 1}), if M \geq 4,

(4)

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BER \leq 2 \exp (- 1.5 \frac{γ}{M - 1}), if M < 4,

(5)

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M (k) = ⌊ 1 - \frac{1.5 γ (k)}{\log (5 {BER}_{T})} ⌋, if M \geq 4,

(6)

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M (k) = ⌊ 1 - \frac{1.5 γ (k)}{\log (0.5 {BER}_{T})} ⌋, if M < 4,

(7)

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Xinyue Guo, Xin Li. Experimental demonstration of an adaptive orthogonal frequency division multiplexing visible light communication system[J]. Chinese Optics Letters, 2016, 14(11): 110604

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