SCMA for downlink multiple access of 5G wireless networks

Nikopour, Hosein; Yi, Eric; Bayesteh, Alireza; Au, Kelvin; Hawryluck, Mark; Baligh, Hadi; Ma, Jun

doi:10.1109/glocom.2014.7037423

Cited by 198 publications

(89 citation statements)

References 6 publications

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“…In contrast, code-domain NOMA utilizes user-specific spreading sequences that are either sparse sequences or non-orthogonal cross-correlation sequences of low correlation coefficient. This can be further divided into a few different classes, such as low-density spreading CDMA (LDS-CDMA) [4,5], low-density spreading-based OFDM (LDS-OFDM) [6,7], and sparse code multiple access (SCMA) [8,9]. The use of low-density spreading sequences helps LDS-CDMA to limit the impact of interference on each chip of basic CDMA systems.…”

Section: Basic Concepts Of Nomamentioning

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

2,115

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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Section: Basic Concepts Of Nomamentioning

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

2,115

1,162

View full text Add to dashboard Cite

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“…Let us reconsider the average M-SEP of a MU, whose union bound was previously formulated in (30 [33] again, we obtain the conventional union bound of the average M-SEP for a MU, which may be formulated as…”

Section: Benefit Of Cloud Partitioning Of Synthetic Scma Codebookmentioning

confidence: 99%

“…In more depth, P u denotes the power available for the u th MU, while E U u=1 x u 2 represents the power averaged over all constellation points given by the sum 2 In SCMA encoder, the information bits destined for a MU may be further divided into multiple data streams. Each of the data stream requires a specific signature and hence invokes an additional column in the SCMA signature matrix, which was interpreted as occupying a SCMA layer in [22], [30]. Without loss of generality, throughout this paper, we assume that a MU only utilizes a single SCMA layer.…”

Section: A System Modelmentioning

confidence: 99%

“…For instance, Yu et al attempted to further narrow the performance discrepancy between the SCMA system and the single user system, employing more advanced lattices [27], while Xiao et al used more powerful iterative decoding algorithms [28]. As another important milestone, Chen et al further reduced the complexity [29], while the throughput of SCMA operating in downlink broadcast channels was studied by Nikopour et al [30]. However, only experimental results were shown.…”

Section: Introductionmentioning

confidence: 99%

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Cutoff Rate of Sparse Code Multiple Access in Downlink Broadcast Channels

Wang

et al. 2017

IEEE Trans. Commun.

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Abstract-For the sake of supporting massive connectivity in future 5G networks, non-orthogonal multiple access (NOMA) techniques are advocated. As a promising NOMA technique, in recent years sparse code multiple access (SCMA) has attracted substantial attention. However, there is a paucity of studies on the theoretical analysis of its error-freely achievable data rate, especially in the downlink context. Hence, we derive the cutoff rate of SCMA in downlink broadcast channels, which indicates the lower-bound of a system's errorfreely achievable rate. However, we will demonstrate that when considering the conventional categorization of pairwise error events, the accuracy of the cutoff rate rapidly degrades in the low-SNR region owing to the fact that multi-user SCMA systems typically encounter an extremely large constellation size. Alternatively, by invoking Bergmans' concept from 1973 in the categorization of pairwise error events, we obtain a more accurate cutoff rate both in the low-and the high-SNR regions. Moreover, we provide insights into the cutoff rate derivation process, which reveals some general guidelines for designing a beneficial codebook, capable of improving SCMA with respect to its original low-density signature (LDS) based counterpart.

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“…In Korea, Samsung tested and verified the technical feasibility of millimeter wave in the bands of about 28 GHz [2]. Other possible candidate technologies such as massive MIMO [3], novel multiple access [4], and new channel coding [5][6][7] have attracted more and more interest. The International Telecommunication Union (ITU) has also started its study on the International Mobile Telecommunication system towards 2020 (IMT-2020) since 2013 [8].…”

Section: Introductionmentioning

confidence: 99%

5G: Vision and Requirements for Mobile Communication System towards Year 2020

Liu

Jiang

2016

Chinese Journal of Engineering

141

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The forecast for future 10 years' traffic demand shows an increase in 1000 scales and more than 100 billion connections of Internet of Things, which imposes a big challenge for future mobile communication technology beyond year 2020. The mobile industry is struggling in the challenges of high capacity demand but low cost for future mobile network when it starts to enable a connected mobile world. 5G is targeted to shed light on these contradictory demands towards year 2020. This paper firstly forecasts the vision of mobile communication's application in the daily life of the society and then figures out the traffic trends and demands for next 10 years from the Mobile Broadband (MBB) service and Internet of Things (IoT) perspective, respectively. The requirements from the specific service and user demands are analyzed, and the specific requirements from typical usage scenarios are calculated by the defined performance indicators. To achieve the target of affordable 5G service, the requirements from network deployment and operation perspective are also captured. Finally, the capabilities and the efficiency requirements of the 5G system are demonstrated as a flower. To realize the vision of 5G, "information a finger away, everything in touch," 5G will provide the fiber-like access data rate, "zero" latency user experience, and connecting to more than 100 billion devices and deliver a consistent experience across a variety of scenarios with the improved energy and cost efficiency by over a hundred of times.

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SCMA for downlink multiple access of 5G wireless networks

Cited by 198 publications

References 6 publications

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

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

Cutoff Rate of Sparse Code Multiple Access in Downlink Broadcast Channels

5G: Vision and Requirements for Mobile Communication System towards Year 2020

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