A power-efficient ZF precoding scheme for multi-user indoor visible light communication systems

Zhao, Qiong; Fan, Yangyu; Deng, Lijun; Kang, Bochao

doi:10.1016/j.optcom.2016.09.065

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Many approaches have been proposed to provide multi-user communication in VLC systems. One of these is to use multiple input single output (MISO) and multiple input multiple output (MIMO) techniques with zero-forcing pre-coding schemes to reduce the effects of co-channel interference (CCI) between transmitters [3][4][5]. Other approaches utilise multiple access dimensions to support multi-user communication in VLC systems.…”

Section: Introductionmentioning

confidence: 99%

WDM for multi‐user indoor VLC systems with SCM

et al. 2019

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A system that employs wavelength division multiplexing (WDM) in conjunction with sub-carrier multiplexing (SCM) tones is proposed to realise high data rate multiuser indoor visible light communication (VLC). The SCM tones, which are unmodulated signals, are used to identify each light unit, to find the optimum light unit for each user and to calculate the level of the co-channel interference (CCI). WDM is utilised to attain a high data rate for each user. In this study, multi-colour (four colours) laser diodes are utilised as sources of lighting and data communication. One of the WDM colours is used to convey the SCM tones at the beginning of the connection to set up the connection among receivers and light units (to find the optimum light unit for each user). To evaluate the performance of the VLC system, two types of receivers are proposed: an array of nonimaging receivers and an array of non-imaging angle diversity receivers. In this study, the effects of diffuse reflections, CCI and mobility on the system performance are considered.

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Section: Introductionmentioning

confidence: 99%

WDM for multi‐user indoor VLC systems with SCM

et al. 2019

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“…Recently, there have been several contributions to the multiuser TPC in VLC [15][16][17][18][19][20][21]. The authors of [15][16][17][18] investigated the zero-forcing (ZF) TPC strategies under various design criteria for multiuser VLC systems. In particular, [18] also included an optimal TPC scheme under the max-min fairness criterion.…”

Section: Introductionmentioning

confidence: 99%

Multiuser Transmit Precoding Design for Dimming Compatible Visible Light Communications

Xue

et al. 2019

Applied Sciences

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In multiuser visible light communication (VLC) systems, many transmit precoding (TPC) techniques have been investigated to suppress multiuser interference. However, these conventional works restrict their modulation to the special case of zero mean, which inherently limits their application to some popular modulations associated with the non-zero mean in VLC, such as pulse position modulation (PPM). Since the modulation with non-zero mean leads to more intricate optical power constraints and design objective functions than the case of zero mean, the TPC design that can support a general modulation is still an open problem. In the paper, we conceive of a general solution of the TPC scheme combined with dimming control for multiuser VLC systems, which is capable of mitigating multiuser interference, while at the same time, achieving the desired dimming level. The proposed scheme is applicable to a wide range of modulations in VLC, such as pulse amplitude modulation (PAM), PPM, and so on. Simulation results demonstrate that the proposed scheme outperforms the traditional pseudo-inverse-based zero-forcing TPC in terms of bit error rate (BER).

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