Non-orthogonal multiple access (NOMA) for indoor visible light communications

Kızılırmak, Refik Çağlar; Rowell, Corbett; Uysal, Murat

doi:10.1109/iwow.2015.7342274

Cited by 128 publications

(107 citation statements)

References 10 publications

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“…Likewise, it was shown in [29] that NOMA also outperforms OFDMA in terms of the achievable data rate in the downlink of VLC systems. It is noted here that the majority of the reported contributions on optical NOMA assume perfect knowledge of the channel fading coefficients.…”

Section: A Related Literaturementioning

confidence: 93%

On the Performance of Visible Light Communication Systems With Non-Orthogonal Multiple Access

Marshoud¹,

Sofotasios²,

Muhaidat³

et al. 2017

IEEE Trans. Wireless Commun.

156

101

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Visible light communications (VLC) have been recently proposed as a promising and efficient solution to indoor ubiquitous broadband connectivity. In this paper, non-orthogonal multiple access, which has been recently proposed as an effective scheme for fifth generation (5G) wireless networks, is considered in the context of VLC systems, under different channel uncertainty models. To this end, we first derive a novel closed-form expression for the bit-error-rate (BER) under perfect channel state information (CSI). Capitalizing on this, we quantify the effect of noisy and outdated CSI by deriving a simple approximated expression for the former and a tight upper bound for the latter. The offered results are corroborated by respective results from extensive Monte Carlo simulations and are used to provide useful insights on the effect of imperfect CSI knowledge on the system performance. It was shown that, while noisy CSI leads to slight degradation in the BER performance, outdated CSI can cause detrimental performance degradation if the order of the users' channel gains change as a result of mobility.

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Section: A Related Literaturementioning

confidence: 93%

On the Performance of Visible Light Communication Systems With Non-Orthogonal Multiple Access

Marshoud¹,

Sofotasios²,

Muhaidat³

et al. 2017

IEEE Trans. Wireless Commun.

156

101

View full text Add to dashboard Cite

show abstract

“…However, these works simply reflect a scenario with multiple light emitting diodes (LEDs) in an indoor environment; real high-speed OFDM-based communications has not been considered. Other research investigated optical OFDM transmission and compared the achievable capacities of NOMA and OFDMA [48]. It also analyzed the impact of cancellation error in SIC receivers for VLC systems.…”

Section: Noma In Visible Light Communicationsmentioning

confidence: 99%

“…But it needs explicit analysis to understand the outage behaviors of cell-edge users. Other NOMA works, for example, NOMA with VLC [48] and NOMA with coding [52,53], can be further investigated to analyze outage performance.…”

Section: G Outage Probability Analysismentioning

confidence: 99%

Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges

Islam

Avazov

Dobre

et al. 2017

IEEE Commun. Surv. Tutorials

2,102

1,162

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Abstract-Non-orthogonal multiple access (NOMA) is one of the promising radio access techniques for performance enhancement in next-generation cellular communications. Compared to orthogonal frequency division multiple access (OFDMA), which is a well-known high-capacity orthogonal multiple access (OMA) technique, NOMA offers a set of desirable benefits, including greater spectrum efficiency. There are different types of NOMA techniques, including power-domain and code-domain. This paper primarily focuses on power-domain NOMA that utilizes superposition coding (SC) at the transmitter and successive interference cancellation (SIC) at the receiver. Various researchers have demonstrated that NOMA can be used effectively to meet both network-level and user-experienced data rate requirements of fifth-generation (5G) technologies. From that perspective, this paper comprehensively surveys the recent progress of NOMA in 5G systems, reviewing the state-of-the-art capacity analysis, power allocation strategies, user fairness, and user-pairing schemes in NOMA. In addition, this paper discusses how NOMA performs when it is integrated with various proven wireless communications techniques, such as cooperative communications, multiple-input multiple-output (MIMO), beamforming, space-time coding, and network coding, among others. Furthermore, this paper discusses several important issues on NOMA implementation and provides some avenues for future research. I. INTRODUCTIONFrom analog phone calls through to all Internet Protocol services, including voice and messaging, each transition has been encouraged by the need to meet the requirements of the new generation of mobile technology. Subsequently, mobile communications technology is presently facing a new challenge, giving birth to a hyper-connected society through the emergence of fifth-generation (5G) services. With enormous potential for both consumers and industry, 5G is expected to roll out by 2020. From the next-generation radio access technology viewpoint, a step change in data speed and a significant reduction in end-to-end latency is a major concern for 5G, since the rapid development of the mobile Internet and the Internet of Things (IoT) exponentially accelerates the demand for high data-rate applications. In particular, many of the industry initiatives that have progressed with work on 5G declare that the network-level data rate in 5G should be 10-20 Gbps (that is, 10-20 times the peak data rate in 4G), and the user-experienced data rate should be 1 Gbps (100 times the user-experienced data rate in 4G). They also set the latency (end-to-end round-trip delay) at 1 millisecond (one-fifth of the latency in 4G).The underlying physical connection in a cellular network is called radio access technology, which is implemented by a radio access network (RAN). A RAN basically utilizes a channel access technique to provide the mobile terminals with a connection to the core network. The design of a suitable multiple access technique is one of the most important aspects in improvi...

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“…As discussed before, the sum rate of NOMA users can always be expressed as (18), regardless of their decoding order. Therefore, the average sum rate of NOMA users can be calculated as (32) shown at the top of the next page, where step (a) follows by the definition of instantaneous sum rate in (18), applying [39, Eq. (4.337.2)], and defining eEi(t) e t Ei(−t), ∀t > 0.…”

Section: B Average Sum Ratementioning

confidence: 99%

“…For example, a two-user downlink power-domain NOMA system, also referred to as multiuser superposition transmission, has been proposed for inclusion in the Third Generation Partnership Project (3GPP) long-term evolution advanced (LTE-A) standard [11]. Motivated by this, power-domain NOMA has been explored in various directions, including multiple-input multiple-output systems [12], cooperative transmission [13], simultaneous wireless information and power transfer [14]- [16], ultrareliable and low-latency communications [17], visible-light communications [18], and millimeter-wave (mmWave) communications [19], (see, e.g., [3] for a comprehensive survey).…”

Section: Introductionmentioning

confidence: 99%

Uplink Non-Orthogonal Multiple Access Over Mixed RF-FSO Systems

Jamali

Mahdavifar

2020

IEEE Trans. Wireless Commun.

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In this paper, we consider a relay-assisted uplink non-orthogonal multiple access (NOMA) system. In this system, two radio frequency (RF) users are grouped for simultaneous transmissions, over each resource block, to an intermediate relay.The relay then forwards the amplified version of the users' aggregated signals, in the presence of multiuser interference, to a relatively far destination. In order to cope with the users' everincreasing desire for higher data rates, a high-throughput freespace optics (FSO) link is employed as the relay-destination backhaul link. It is assumed that the FSO backhaul link is subject to Gamma-Gamma turbulence with pointing error. Also, a Rayleigh fading model is considered for the user-relay access links. Under these assumptions, we derive closed-form expressions for the outage probability and tractable forms, involving only onedimensional integrals, for the ergodic capacity. Moreover, the outage probability and ergodic capacity analysis are extended to the conventional RF-backhauled systems in the presence of multiuser interference to both relay and destination nodes, and Rician fading for the relay-destination RF link. Our results reveal the superiority of FSO backhauling for high-throughput and high-reliability NOMA systems compared to RF backhauling. This work can be considered as a general analysis of dual-hop uplink NOMA systems as well as the first attempt to incorporate power-domain NOMA in mixed RF-FSO systems.

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Non-orthogonal multiple access (NOMA) for indoor visible light communications

Cited by 128 publications

References 10 publications

On the Performance of Visible Light Communication Systems With Non-Orthogonal Multiple Access

On the Performance of Visible Light Communication Systems With Non-Orthogonal Multiple Access

Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges

Uplink Non-Orthogonal Multiple Access Over Mixed RF-FSO Systems

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