Non-orthogonal multiple access for 5G: solutions, challenges, opportunities, and future research trends

Dai, Linglong; Wang, Bichai; Yuan, Yifei; Han, Shuangfeng; Chih‐Lin, I; Hanzo, Lajos

doi:10.1109/mcom.2015.7263349

Cited by 2,553 publications

(1,463 citation statements)

References 12 publications

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“…Aiming to achieve higher spectral efficiency and satisfy 5G requirements, non-orthogonal multiple access (NOMA) techniques are considered both for the downlink [4] and the uplink [5]. NOMA is also helpful in a multi-cell environment to manage inter-cell interference [6].…”

Section: B Related Workmentioning

confidence: 99%

Effective Design of Multi-User Reception and Fronthaul Rate Allocation in 5G Cloud RAN

Boviz

Chen

Yang

2017

IEEE J. Select. Areas Commun.

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Abstract-Cloud Radio Access Network (C-RAN) is becoming more than ever timely in 5G for dense network deployments, but its design has to be adapted to 5G requirements. To ensure high uplink throughput in celledge regions affected by inter-cell interference, C-RAN enables multi-user reception techniques among cells. In this paper, we propose an efficient end-to-end uplink transmission scheme dealing with implementation and deployment constraints on both communication interfaces in C-RAN, i.e., the wireless one between the users and the Remote Radio Heads (RRHs), and the fronthaul links between the RRHs and the central processing unit. Multi-cell nonorthogonal multiple access (NOMA) can improve spectral efficiency and cell-edge throughput, but its design needs to fit requirements regarding receiver complexity and delay. Optimizing the fronthaul rate allocation to maximize the benefit of the transmissions allows to exploit the fronthaul links effectively. Our model considers the throughput of NOMA transmissions in C-RAN and the expense related to fronthaul usage in various deployment scenarios. When the available fronthaul rate allows accurate transmission, optimizing fronthaul rate allocation results in 10% higher transmission benefit than uniform allocation. It also makes possible to involve less users in NOMA while keeping the benefit. The proposed strategy enables uplink multi-cell multi-user processing in a cost-effective manner in 5G C-RAN deployments.

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Section: B Related Workmentioning

confidence: 99%

Effective Design of Multi-User Reception and Fronthaul Rate Allocation in 5G Cloud RAN

Boviz

Chen

Yang

2017

IEEE J. Select. Areas Commun.

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“…To mitigate the complexity of signal processing at the UE side, we consider no cooperative communications at the UEs, and treat the first weak signal from the MBS→UE link as noise. According to the basis of NOMA [4]- [6], the decoding order in cluster c is predefined as the descending order of [5]. We use b c (k) to indicate the position of UE k ∈ K c in the sorted sequence in cluster c. Thus, UE k in cluster c before decoding its desired signal x k , first decodes and subtracts the received signals x j in {j ∈ K c \{k} : b c (j ) > b c (k)}.…”

Section: System Modelmentioning

confidence: 99%

“…In downlink, NOMA is enabled by superposition coding at the transmitter, and relying on multi-user detection (MUD) and successive interference cancellation (SIC) at the receivers to remove some of the co-channel interference [6]. Many works, e.g., [4], [7], [8], have shown that NOMA can improve performance in terms of throughput, fairness, power, and outage probability.…”

Section: Introductionmentioning

confidence: 99%

Energy optimization for full-duplex self-backhauled HetNet with non-orthogonal multiple access

Lei

Lagunas

Maleki

et al. 2017

2017 IEEE 18th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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Abstract-Small cell densification and advanced multi-user access schemes are promising approaches to dramatically improve 5G system performance. Towards efficient spectrum usage in ultra-dense heterogeneous networks, spectrum reuse between backhauling and access links combined with full duplex is applied. This forms a full-duplex self-backhauled heterogeneous network (FS-HetNet). Considering co-channel interference caused by frequency reuse, and residual self interference due to imperfect interference cancellation in full duplex, interference management becomes a major issue in boosting network performance. In this paper, motivated by the emerging non-orthogonal multiple access (NOMA) for 5G, we consider a NOMA-based scheme to mitigate co-channel interference and achieve efficient spectrum utilization for FS-HetNet. We address an energy-saving problem for the considered network, aiming to satisfy all users' data demand within a limited transmit duration by consuming minimum energy. In addition to the energy consumption in transmission, the consumed decoding energy due to signal processing in successive interference cancellation is also taken into account. We propose an energy-efficient and delay-constrained scheduling algorithm to jointly optimize transmit power, user clustering, and transmission duration. Numerical results demonstrate that the proposed approach outperforms previous schemes.

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“…Non-orthogonal multiple access (NOMA) as a candidate for 5G technology has been widely concerned [1].The future 5G wireless communication network will meet the wireless networking needs of a variety for network equipment, especially for the scene of 5G Massive…”

Section: Introductionmentioning

confidence: 99%

An improved reconstruction algorithm based on multi-user detection for uplink grant-free NOMA

Hou

2017

MATEC Web Conf.

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Abstract. For the traditional orthogonal matching pursuit(OMP) algorithm in multi-user detection(MUD) for uplink grant-free NOMA, here is a poor BER performance, so in this paper we propose an temporal-correlation orthogonal matching pursuit algorithm(TOMP) to realize muli-user detection. The core idea of the TOMP is to use the time correlation of the active user sets to achieve user activity and data detection in a number of continuous time slots. We use the estimated active user set in the current time slot as a priori information to estimate the active user sets for the next slot. By maintaining the active user set l Tˆof size K(K is the number of users),but modified in each iteration. Specifically, active user set is believed to be reliable in one iteration but shown error in another iteration, can be added to the set path delay l Tˆor removed from it. Theoretical analysis of the improved algorithm provide a guarantee that the multi-user can be successfully detected with a high probability. The simulation results show that the proposed scheme can achieve better bit error rate (BER) performance in the uplink grant-free NOMA system.

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Non-orthogonal multiple access for 5G: solutions, challenges, opportunities, and future research trends

Cited by 2,553 publications

References 12 publications

Effective Design of Multi-User Reception and Fronthaul Rate Allocation in 5G Cloud RAN

Effective Design of Multi-User Reception and Fronthaul Rate Allocation in 5G Cloud RAN

Energy optimization for full-duplex self-backhauled HetNet with non-orthogonal multiple access

An improved reconstruction algorithm based on multi-user detection for uplink grant-free NOMA

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