Flexible Generalized Spatial Modulation for Visible Light Communications

Al-Nahhal, Mohamed; Başar, Ertuğrul; Uysal, Murat

doi:10.1109/tvt.2020.3047652

“…In order to demonstrate the effectiveness of the proposed scheme, we have provided a comparison with the recent work on flexible generalized SM (FGSM) in [7]. For fairness, Photonics Journal Fig.…”

Section: Numerical Results and Insightsmentioning

confidence: 99%

“…Similar investigations on integrating adaptive modulation schemes with SM appeared also in [10], [22], [23]. Finally, in order to enhance the error rate performance of adaptive SM schemes, the authors of [7] proposed a flexible SM scheme that changes the modulation sizes over the LEDs and the number of active LEDs.…”

Section: Introductionmentioning

confidence: 91%

“…On the other hand, a photo detector (PD) is utilized at the receiver in order to retrieve the original signal, a process known as direct detection (DD). However, VLC systems suffer from the limited modulation bandwidth of LEDs in addition to the constraints imposed by IM/DD schemes that, unlike RF communications, require the transmitted signals to be positive and real-valued [6], [7]. Hence, the implementation of spectrally efficient modulation schemes that overcome these limitations is of paramount importance for the design of efficient high data rate VLC systems [5], [7]- [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Effective Spatial Modulation Based Scheme for Indoor VLC Systems

Naser

¹

,

Bariah

²

,

Muhaidat

³

et al. 2022

IEEE Photonics J.

7

0

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We propose an enhanced spatial modulation (SM)based scheme for indoor visible light communication systems. This scheme enhances the achievable throughput of conventional SM schemes by transmitting higher order complex modulation symbol, which is decomposed into three different parts. These parts carry the amplitude, phase, and quadrant components of the complex symbol, which are then represented by unipolar pulse amplitude modulation (PAM) symbols. Superposition coding is exploited to allocate a fraction of the total power to each part before they are all multiplexed and transmitted simultaneously, exploiting the entire available bandwidth. At the receiver, a two-step decoding process is proposed to decode the active light emitting diode index before the complex symbol is retrieved. It is shown that at higher spectral efficiency values, the proposed modulation scheme outperforms conventional SM schemes with PAM symbols in terms of average symbol error rate (ASER), and hence, enhancing the system throughput. Furthermore, since the performance of the proposed modulation scheme is sensitive to the power allocation factors, we formulated an ASER optimization problem and propose a sub-optimal solution using successive convex programming (SCP). Notably, the proposed algorithm converges after only few iterations, whilst the performance with the optimized power allocation coefficients outperforms both random and fixed power allocation.

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“…In order to demonstrate the effectiveness of the proposed scheme, we have provided a comparison with the recent work on flexible generalized SM (FGSM) in [7]. For fairness, Fig.…”

Section: Numerical Results and Insightsmentioning

confidence: 99%

“…Ro(ϕ rℓ )Ts(φ rℓ )g(φ rℓ ) cos(φ rℓ ), 0 φ rℓ φc, 0, otherwise, (7) where A denotes the PD area, d rℓ is the distance between the ℓ th LED and the r th PD, ϕ rℓ is the angle of transmission from the ℓ th LED to the r th PD, φ rℓ is the incident angle with respect to the receiver, and φ c is the field of view (FoV) of the PD. Furthermore, T s (φ rℓ ) and g(φ rℓ ) denote the gains of the optical filter and concentrator, respectively, whereas g(φ rℓ ) can be expressed as follows:…”

Section: System and Channel Modelsmentioning

confidence: 99%

An Effective Spatial Modulation Based Scheme for Indoor VLC Systems

Naser¹,

Bariah²,

Muhaidat³

et al. 2022

Preprint

0

View full text Add to dashboard Cite

We propose an enhanced spatial modulation (SM)based scheme for indoor visible light communication systems. This scheme enhances the achievable throughput of conventional SM schemes by transmitting higher order complex modulation symbol, which is decomposed into three different parts. These parts carry the amplitude, phase, and quadrant components of the complex symbol, which are then represented by unipolar pulse amplitude modulation (PAM) symbols. Superposition coding is exploited to allocate a fraction of the total power to each part before they are all multiplexed and transmitted simultaneously, exploiting the entire available bandwidth. At the receiver, a two-step decoding process is proposed to decode the active light emitting diode index before the complex symbol is retrieved. It is shown that at higher spectral efficiency values, the proposed modulation scheme outperforms conventional SM schemes with PAM symbols in terms of average symbol error rate (ASER), and hence, enhancing the system throughput. Furthermore, since the performance of the proposed modulation scheme is sensitive to the power allocation factors, we formulated an ASER optimization problem and propose a sub-optimal solution using successive convex programming (SCP). Notably, the proposed algorithm converges after only few iterations, whilst the performance with the optimized power allocation coefficients outperforms both random and fixed power allocation.

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BER performance of MIMO based NOMA‐VLC system with imperfect SIC

Dixit

¹

,

Kumar

²

2021

Trans Emerging Tel Tech

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In this article, multiple‐input multiple‐output (MIMO) technique is employed with non‐orthogonal multiple access‐visible light communication (NOMA‐VLC) systems, namely MIMO‐NOMA‐VLC, to develop a low error and high data rate network. In particular, a multi‐user downlink MIMO‐NOMA‐VLC system with equal gain combiner (EGC) at the receiver is proposed. The on‐off keying (OOK) and L‐pulse position modulation (L‐PPM) is adopted for performance analysis. The imperfect successive interference cancellation (SIC) scenario is also considered to emphasize the practicability of the system. The closed‐form expressions for bit‐error‐rate (BER) of the proposed MIMO‐NOMA‐VLC system are derived with perfect and imperfect SIC. Specifically, two and three‐user scenarios are considered for detailed analysis. The MIMO‐NOMA‐VLC system with EGC combiner at the receiver completely outperforms the single‐input single‐output (SISO‐NOMA‐VLC) system. The proposed MIMO‐NOMA‐VLC system provides the best error performance at the power allocation co‐efficient assigned to far user of 0.3. Further, the error performance of the proposed MIMO‐NOMA‐VLC system is investigated for the system parameters such as diversity order, modulation order, user count and so forth. The derived analytical results are verified with the Monte‐Carlo simulation results.

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Flexible Generalized Spatial Modulation for Visible Light Communications

Cited by 15 publications

References 14 publications

An Effective Spatial Modulation Based Scheme for Indoor VLC Systems

An Effective Spatial Modulation Based Scheme for Indoor VLC Systems

An Effective Spatial Modulation Based Scheme for Indoor VLC Systems

BER performance of MIMO based NOMA‐VLC system with imperfect SIC

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