Cutoff Rate of Sparse Code Multiple Access in Downlink Broadcast Channels

Li, Li; Ma, Zheng; Wang, Li; Fan, Ping Zhi; Hanzo, Lajos

doi:10.1109/tcomm.2017.2703607

Cited by 10 publications

(2 citation statements)

References 34 publications

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“…The SCMA technique is an appropriate access technique for downlink that can increase the overall throughput through user multiplexing and is well-matched to heavily loaded 5G networks [4], [7]- [14]. Notably, the main practical challenge with using the SCMA in the downlink transmission is the complexity of the multiuser detection on the receiver side.…”

Section: Introductionmentioning

confidence: 99%

Robust Radio Resource Allocation in MISO-SCMA Assisted C-RAN in 5G Networks

Moltafet

Parsaeefard

Javan

et al. 2019

IEEE Trans. Veh. Technol.

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In this paper, by considering multiple slices, a downlink transmission of a sparse code multiple access (SCMA) based cloud-radio access network (C-RAN) is investigated. In this regard, by supposing multiple input and single output (MISO) transmission technology, a novel robust radio resource allocation is proposed where considering uncertain channel state information (CSI), the worst case approach is applied. The main goal of the proposed radio resource allocation is to, maximize the system sum rate with maximum available power at radio remote head (RRH), minimum rate requirement of each slice, maximum frounthaul capacity of each RRH, user association, and SCMA constraints. To solve the proposed optimization problem in an efficient manner, an iterative method is deployed where in each iteration, beamforming and joint codebook allocation and user association subproblem are solved separately. By introducing some auxiliary variables, the joint codebook allocation and user association subproblem is transformed into an integer linear programming, and to solve the beamforming optimization problem, minorization-maximization algorithm (MMA) is applied. Via numerical results, the performance of the proposed system model versus different system parameters and for different channel models are investigated. Index Terms-5G, Sparse code multiple access (SCMA), C-RAN, robust resource allocation.

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Section: Introductionmentioning

confidence: 99%

Robust Radio Resource Allocation in MISO-SCMA Assisted C-RAN in 5G Networks

Moltafet

Parsaeefard

Javan

et al. 2019

IEEE Trans. Veh. Technol.

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“…The research for the SCMA system is mainly focused on codebook design [4,17,18], MUD technology [19,20,21], and performance evaluation [22,23,24,25]. For example, Ref.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of SCMA-Based Hybrid Unicast-Multicast Relay-Assisted Networks

Zhang

Wang

et al. 2019

Sensors

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This paper studies a multi-user network model based on sparse code multiple access (SCMA), where both unicast and multicast services are considered. In the direct transmission scheme, the communication between the base station (BS) and the users is completed with one stage, in which the relay is inexistent. In the two-stage cooperative transmission scheme, any number of relays are placed to improve the reliability of wireless communication system. The BS broadcasts the requested message to users and relays in the first stage, and the successful relays forward the message to unsuccessful users in the second stage. To characterize the performance of these two schemes, we derive the exact and approximate expressions of average outage probability. Furthermore, to take full advantage of the cooperative diversity, an optimal power allocation and relay location strategy in the high signal-to-noise ratio (SNR) regime is studied. The outage probability reaches the minimum value when the first stage occupies half of the total energy consumed. Simulation and analysis results are presented to demonstrate the performance of these two schemes. The results show that the two-stage cooperative scheme effectively reduce the average outage probability in SCMA network, especially in the high SNR region.

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