• Chinese Optics Letters
  • Vol. 18, Issue 9, 090601 (2020)
Monette H. Khadr* and Hany Elgala
Author Affiliations
  • Electrical and Computer Engineering Department, University at Albany, New York 12222, USA
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    DOI: 10.3788/COL202018.090601 Cite this Article Set citation alerts
    Monette H. Khadr, Hany Elgala. Augmented communications: spectral efficiency and security enhanced visible light communications by design[J]. Chinese Optics Letters, 2020, 18(9): 090601 Copy Citation Text show less

    Abstract

    A plethora of physical-layer techniques aim to enhance the performance of communication systems in several ways. Spectral efficiency and security are on the top of the list of enhancements; however, both are isolated and antagonistic islands of research. Augmented communication (ACom) is introduced in this Letter as the first technique that aims to combine these two enhancements in visible light communications (VLCs). The dividends of the proposed concept are demonstrated via simulations and the performance is experimentally validated. Results show that ACom can simultaneously provide the high spectral efficiency and the resistance to eavesdropping, while introducing minimal signal-to-noise ratio penalties.
    x[n]=x=1Nk=0N1Xkej2πknN,(1)

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    Xk=XkmodN*=XNk*,(2)

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    s=s[n]=g(x[n]),(3)

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    g(x[n])=βx[n]+αb[n],(4)

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    ρ=N2log2M+η,(5)

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    px(x)=N(x;0;E[|Xk|2]),(6)

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    N(x;μ;σ2)12πσe(xμ)22σ2,(7)

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    ps(x)=N(x;α;β2σ2),(8)

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    E[s]=α,E[|s|2]=β2σ2+α2.(9)

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    BER=2(M1)Mlog2MQ(6log2MM21SNR),(10)

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    Q(m)mN(τ;0;1)dτ1φ(m),(11)

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    SNReff=SNREsEs+α2=EsN0EsEs+α2=EsN011+γ2,(12)

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    fuHi(u0Hi,,uN1Hi|x^Hi,Hi)=(12πσw)Nexp[12σw2n=0N1(unHi+bnHix^n,Hi)2],(13)

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    b^[n]=maxi[fuHi(u0Hi,,uN1Hi|x^Hi,Hi)]=maxin=0N1(unHi+bnHix^n,Hi)2.(14)

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    Monette H. Khadr, Hany Elgala. Augmented communications: spectral efficiency and security enhanced visible light communications by design[J]. Chinese Optics Letters, 2020, 18(9): 090601
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