Interference mitigation and capacity enhancement using constraint field of view ADR in downlink VLC channel

Eldeeb, Hossien B.; Selmy, Hossam A. I.; ElSayed, Hany M.; Badr, Ragia I.

doi:10.1049/iet-com.2017.1174

Cited by 36 publications

(20 citation statements)

References 66 publications

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“…This work shows that with optimum combining, ADR is able to achieve an SINR performance close to that of interference-free systems. In [78], zero-forcing precoding was combined with ADR. This approach can noticeably improve the SINR performance, especially for LiFi cell-edge users.…”

Section: ) Specially Tailoredmentioning

confidence: 99%

Hybrid LiFi and WiFi Networks: A Survey

Soltani

Zhou

et al. 2021

IEEE Commun. Surv. Tutorials

175

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In order to tackle the rapidly growing number of mobile devices and their expanding demands for Internet services, network convergence is envisaged to integrate different technology domains. For indoor wireless communications, one promising approach is to coordinate light fidelity (LiFi) and wireless fidelity (WiFi), namely hybrid LiFi and WiFi networks (HLWNets). This hybrid network combines the high-speed data transmission of LiFi and the ubiquitous coverage of WiFi. In this paper, we present a survey-style introduction to HLWNets, starting with a framework of system design in the aspects of network architectures, cell deployments, multiple access and modulation schemes, illumination requirements and backhaul. Key performance metrics and recent achievements are then reviewed to demonstrate the superiority of HLWNets against stand-alone networks. Further, the unique challenges facing HLWNets are elaborated on key research topics including user behavior modeling, interference management, handover and load balancing. Moreover, the potential of HLWNets in the application areas is presented, exemplified by indoor positioning and physical layer security. Finally, the challenges and future research directions are discussed.

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Section: ) Specially Tailoredmentioning

confidence: 99%

Hybrid LiFi and WiFi Networks: A Survey

Soltani

Zhou

et al. 2021

IEEE Commun. Surv. Tutorials

175

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“…Clearly, for CFOV-ADR without CCI management, the detected signal on each PD is the one with highest received SINR while the other signals are considered as interfered signals. The SINR in this case is calculated from (28) as shown at the bottom of this page [39], where D j is the desired LED for which the SINR at PD i is calculated. Obviously, all received NLOS signals are considered as interfered signals as they arrive with different delays from decoded LOS signals.…”

Section: Performance Evaluationmentioning

confidence: 99%

Interference Mitigation Using Angular Diversity Receiver With Efficient Channel Estimation in MIMO VLC

et al. 2020

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Visible Light Communication (VLC) is a promising solution to meet the ever increasing demand for indoor data connectivity with high bit rates. VLC uses the license-free bands and provides high-speed connections unlike RF wireless communication. However; indoor VLC suffers from performance degradation due to either co-channel interference (CCI) or inter-symbol interference (ISI). In this paper, an interference management scheme is proposed for VLC Multi-Input Multi-Output (MIMO) based systems. The scheme reduces the number of interfered signals by using a constrained field-of-view angular diversity receiver CFOV-ADR and then uses least-square (LS) channel estimation with maximum-likelihood (ML) equalizer to resolve the interfered signals. The proposed interference mitigation scheme using constrained-FOV-ADR with channel estimation IM-CFOV-CE enables frequency reuse of one. The bit-error-rate (BER) is calculated at various room positions with different receiver's heights and rotation angles. The performance evaluation results reveal that the proposed system can achieve a higher number of downlink channels and superior BER performance than that of without CCI management. Also, the proposed scheme has been compared with Time Division Multiple Access (TDMA) technique, and achieves enhanced performance at all positions and orientations of the ADR. INDEX TERMS Angular diversity receiver (ADR), co-channel interference (CCI), interference mitigation, visible light communication (VLC).

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“…The basic idea of ADR is to use multiple photodetectors (PDs) that point in different directions with different normal unit vectors and incident angles, resulting in less correlated channel gain matrix between all LEDs and PDs. A further better variation of the conventional ADR is the constraint field of view ADR where the FOV angle of the ADR is optimized to also eliminate the line-ofsight (LOS) co-channel interference (CCI) in the downlink LC channel [42]. Furthermore, angle diversity transmitter (ADT) which contains multiple numbers of narrow beam IR-LEDs with different orientations, is used to improve the performance of LC systems [26], [40].…”

Section: Multi-user Uplink Lc System Modelmentioning

confidence: 99%

“…Additional simulation parameters are indicated in Tables. 1 and 2 which are taken similar to [42], [44], [51], [61]. It can be noted that the number of LEDs/PDs in the ADT/ADR of the considered LC system, same as the elevations of LEDs/PDs are assumed to be fixed to reduce the dimensions of the optimization problem.…”

Section: A Simulation Setupmentioning

confidence: 99%

Optimal Resource Allocation and Interference Management for Multi-User Uplink Light Communication Systems With Angular Diversity Technology

et al. 2020

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Light communication (LC) technology has been regarded as a promising candidate for future indoor wireless networks by providing safe, power-efficient, and high data rate communications needed for tomorrow's applications. Both visible light (VL) and infrared (IR) wavelengths can be utilized to design LC systems. It is often proposed that VL can be used to offload downlink traffic while near-IR is typically used in the uplink. In this paper, the uplink multiuser LC system is considered where the system performance is degraded by both inter-symbol interference (ISI) resulting from multipath reflections and inter-user interference (IUI) coming from neighboring users. To mitigate these limitations, an optimal fair resource allocation (OFRA) scheme is proposed which aims to improve the fairness among the users in terms of their received signal to interference plus noise ratios (SINRs) by implementing the angle diversity technology. Precisely, by assigning an ON/OFF state for each LED of the angle diversity transmitter (ADT), used by each user, the IUI can be significantly reduced. Also, the angle diversity receiver (ADR) is used to effectively mitigate the effects of ISI. The allocation matrix which achieves the highest fairness between different users is obtained for different scenarios of user distribution. Toward this, the exhaustive search (ES) method is used to obtain the optimal solution for the optimization problem under consideration. However, to reduce the time complexity of ES method, a quasi-optimal solution called sub-optimal fair resource allocation scheme SFRA is proposed. The sub-optimal solution is based on the genetic algorithm (GA) scheme. The simulation results reveal that both the OFRA and SFRA achieve almost the same performance. Moreover, the simulation results indicate the superior performance of the proposed OFRA scheme over the conventional single transmitter (ST) one.

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Interference mitigation and capacity enhancement using constraint field of view ADR in downlink VLC channel

Cited by 36 publications

References 66 publications

Hybrid LiFi and WiFi Networks: A Survey

Hybrid LiFi and WiFi Networks: A Survey

Interference Mitigation Using Angular Diversity Receiver With Efficient Channel Estimation in MIMO VLC

Optimal Resource Allocation and Interference Management for Multi-User Uplink Light Communication Systems With Angular Diversity Technology

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