Effect of Synchronization Error on Optical Spatial Modulation

Olanrewaju, Hammed G.; Popoola, Wasiu O.

doi:10.1109/tcomm.2017.2726067

Cited by 16 publications

(10 citation statements)

References 34 publications

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“…To illustrate the performance of SPPM and without any loss of generality, we consider: N t = [2,4] and L = [2,8], RX coordinate: (x, y, z) = (1.8, 2, 0)m, and the TX coordinates as provided in Table I. For a fair comparison, the system is designed to achieve equal bit rate for all values of L. For the case of N t = 2, using transmitters TX1 and TX4, the plots of the SER against the SNR per bit, γ b = γ c /M , are depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The SM scheme encodes part of the total bits transmitted per symbol on the index of the activated TX, while the rest are conveyed by the transmitted digital signal modulation. SM has emerged as a low-complexity MIMO technique with a potential to support high data rate and energy-efficient wireless communication [8]. A detailed comparison of optical SM (OSM) technique with other MIMO techniques such as repetition coding (RC) and spatial multiplexing (SMUX) is available in [9].…”

Section: Introductionmentioning

confidence: 99%

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Performance of Optical Spatial Modulation in Indoor Multipath Channel

Olanrewaju

Thompson

Popoola

2018

IEEE Trans. Wireless Commun.

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In this paper, the performance of optical spatial modulation (OSM) in the indoor multipath optical wireless channel is investigated. Multipath propagation of the transmitted signal results in the temporal dispersion which causes intersymbol interference (ISI) especially in high-speed communications. OSM schemes have been investigated in line-of-sight (LOS) channels. However, given the recent trend in Gigabits per second communication, there is need to investigate the impact of the neglected higher-order reflections. Two variants of OSM are explored as case studies: optical space shift keying (OSSK) and spatial pulse position modulation (SPPM). The multipath-induced ISI is modelled to account for the spreading of the transmitted signal, and the analytical upper bound on the symbol error rate of both OSM schemes in multipath channel is derived. The derived analytical bounds are validated by closely matching simulation results. Furthermore, using the spatial distributions of the multipath-induced power penalty, the LOS channel response and the delay spread across the room, we demonstrate how the interaction between these parameters impacts error performance. Multipath-induced ISI has a significant adverse impact on the performance of OSM schemes, particularly on the detection of the activated transmitter as the incurred ISI can alter the channel gain of the received symbol.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Optical Spatial Modulation in Indoor Multipath Channel

Olanrewaju

Thompson

Popoola

2018

IEEE Trans. Wireless Commun.

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“…In [23], a collaborative constellation based generalized SM encoding was presented. In [24], the impact of synchronization error on optical SM was analyzed. In [25], an iterative combinatorial symbol design algorithm was proposed for generalized SM in VLC.…”

Section: Introductionmentioning

confidence: 99%

On the Secrecy Rate of Spatial Modulation-Based Indoor Visible Light Communications

Wang

Lin

et al. 2019

IEEE J. Select. Areas Commun.

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In this paper, we investigate the physical-layer security for a spatial modulation (SM) based indoor visible light communication (VLC) system, which includes multiple transmitters, a legitimate receiver, and a passive eavesdropper (Eve). At the transmitters, the SM scheme is employed, i.e., only one transmitter is active at each time instant. To choose the active transmitter, a uniform selection (US) scheme is utilized. Two scenarios are considered: one is with non-negativity and average optical intensity constraints, the other is with non-negativity, average optical intensity and peak optical intensity constraints. Then, lower and upper bounds on the secrecy rate are derived for these two scenarios. Besides, the asymptotic behaviors for the derived secrecy rate bounds at high signal-to-noise ratio (SNR) are analyzed. To further improve the secrecy performance, a channel adaptive selection (CAS) scheme and a greedy selection (GS) scheme are proposed to select the active transmitter. Numerical results show that the lower and upper bounds of the secrecy rate are tight. At high SNR, small asymptotic performance gaps exist between the derived lower and upper bounds. Moreover, the proposed GS scheme has the best performance, followed by the CAS scheme and the US scheme.

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“…In [12], the performance of SM was compared with that of optical spatial multiplexing and optical repetition coding. The effect of synchronization error on optical SM was investigated in [13]. In [14], an active-space, collaborative constellation-based generalized SM MIMO encoding scheme was proposed.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Spatial Modulation for Visible Light Communications With an Arbitrary Number of Transmitters

Wang

Zhu

et al. 2018

IEEE Access

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As a power and bandwidth efficient modulation scheme, the optical spatial modulation (SM) technique has recently drawn increased attention in the field of visible light communications (VLC). To guarantee the number of bits mapped by the transmitter's index at each timeslot is an integer, the number of transmitters (i.e., light-emitting diodes) in the SM based VLC system is often set be a power of two. To break the limitation on the required number of transmitters and provide more design flexibility, this paper investigates the SM based VLC with an arbitrary number of transmitters. Initially, a channel adaptive bit mapping (CABM) scheme is proposed, which includes three steps: bit mapping in space domain, bit mapping in signal domain, and the channel adaptive mapping. The proposed CABM scheme allows operation with an arbitrary number of transmitters, and is verified to be an efficient scheme through numerical results. Based on the CABM scheme, the information-theoretical aspects of the SM based VLC are analyzed. The theoretical expression of the mutual information is first analyzed. However, it is very hard to evaluate system performance. To obtain more insights, a lower bound of the mutual information is derived, which is in closedform. Both theoretical analysis and numerical results show that the gap between the mutual information and its lower bound is small. Finally, to further improve the system performance, the precoding scheme is proposed for the SM based VLC. Numerical results show that the system performance improves dramatically when using the proposed precoding scheme.

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Effect of Synchronization Error on Optical Spatial Modulation

Cited by 16 publications

References 34 publications

Performance of Optical Spatial Modulation in Indoor Multipath Channel

Performance of Optical Spatial Modulation in Indoor Multipath Channel

On the Secrecy Rate of Spatial Modulation-Based Indoor Visible Light Communications

Adaptive Spatial Modulation for Visible Light Communications With an Arbitrary Number of Transmitters

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