Researching | MISO visible light communication system utilizing hybrid post-equalizer aided pre-convergence of STBC decoding

Journals >Chinese Optics Letters >Volume 16 >Issue 6 >Page 060604 > Article

Chinese Optics Letters
Vol. 16, Issue 6, 060604 (2018)

MISO visible light communication system utilizing hybrid post-equalizer aided pre-convergence of STBC decoding

Liang Qiao, Xingyu Lu, Shangyu Liang, Jiao Zhang, and Nan Chi^*

Author Affiliations

Shanghai Institute for Advanced Communication and Data Science, Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai 200433, China

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DOI: 10.3788/COL201816.060604 Cite this Article Set citation alerts

Liang Qiao, Xingyu Lu, Shangyu Liang, Jiao Zhang, Nan Chi. MISO visible light communication system utilizing hybrid post-equalizer aided pre-convergence of STBC decoding[J]. Chinese Optics Letters, 2018, 16(6): 060604 Copy Citation Text

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Abstract

In this Letter, we propose a modified hybrid linear and nonlinear post-equalizer to aid pre-convergence of space–time block coding (STBC) decoding in the formulated multiple-input-single-output (MISO) visible light communication (VLC) model. Meanwhile, we present a channel estimation algorithm, as the existing method is suboptimal. Experiments demonstrate that a data rate of 1 Gbit/s is easily achieved in 1.3 m indoor free space transmission with the bit error rate (BER) limited to

3.8 \times 10^{3}

. Correspondingly, the Q factor can be improved to 3.13 dB compared to the pure linear equalizer case.

Y (t) = H (t) \cdot [\begin{matrix} x_{1} (t) & - x_{2}^{*} (t) \\ x_{2} (t) & x_{1}^{*} (t) \end{matrix}] + N (t),

(1)

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y (m) = \sum_{i = 0}^{N - 1} h_{i} (m) \cdot x (m - i) + \sum_{i = 0}^{N - 1} \sum_{k = i}^{N - 1} h_{i k} (m) \cdot x (m - i) \cdot x (m - k),

(2)

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y (m) = \sum_{i = 0}^{N - 1} w_{i} (m) \cdot x (m - i) + \sum_{i = 0}^{N I - 1} \sum_{k = i}^{N I - 1} w_{i k} (m) \cdot x (m - i) \cdot x (m - k) .

(3)

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δ_{I} = | | | | y_{I} (m) | - σ_{1} | - σ_{2} | - σ_{3} | - σ_{4} δ_{Q} = | | | | y_{Q} (m) | - σ_{1} | - σ_{2} | - σ_{3} | - σ_{4},

(4)

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γ (m + 1) = γ (m) + μ \cdot (δ_{I} \cdot M_{I} + j \cdot δ_{Q} \cdot M_{Q}) Z^{*} (m),

(5)

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\tilde{X} (t) = H^{- 1} (t) \cdot Y (t) + \tilde{N} (t) = [\begin{matrix} h_{1} (t) & h (t) \\ h_{2}^{*} (t) & - h_{1}^{*} (t) \end{matrix}] \cdot Y (t) + \tilde{N} (t) .

(6)

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[\begin{matrix} h_{s_n} (t) & h_{s_n + 1} (t) \\ h_{s_n + 1}^{*} (t) & - h_{s_n}^{*} (t) \end{matrix}] = [\begin{matrix} c & c \\ c & - c \end{matrix}] .

(7)

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H^{- 1} (t) = \sum_{n = 1}^{N} [\begin{matrix} h_{n} (t) & h_{n + 1} (t) \\ h_{n + 1}^{*} (t) & - h_{n}^{*} (t) \end{matrix}] .

(8)

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\sum_{n = 1}^{N} \min {‖ h_{n} (t) ‖ - ‖ h_{n}^{*} (t) ‖, ‖ h_{n + 1} (t) ‖ - ‖ h_{n + 1}^{*} (t) ‖} \leq ε .

(9)

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H_{opt}^{- 1} (t) = [\begin{matrix} h_{s n} (t) & h_{s n} (t) \\ h_{s n}^{*} (t) & - h_{s n}^{*} (t) \end{matrix}] .

(10)

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\tilde{X} (t) = H^{- 1} (t) \cdot Y (t) + \tilde{N} (t) = [\begin{matrix} h_{s n} (t) & h_{s n} (t) \\ h_{s n}^{*} (t) & - h_{s n}^{*} (t) \end{matrix}] \cdot Y (t) + \tilde{N} (t) .

(11)

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Liang Qiao, Xingyu Lu, Shangyu Liang, Jiao Zhang, Nan Chi. MISO visible light communication system utilizing hybrid post-equalizer aided pre-convergence of STBC decoding[J]. Chinese Optics Letters, 2018, 16(6): 060604

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