scholarly journals Weighted Proportional Fair Scheduling for Downlink Nonorthogonal Multiple Access

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Marie-Rita Hojeij ◽  
Charbel Abdel Nour ◽  
Joumana Farah ◽  
Catherine Douillard
Keyword(s):  
Interference Cancellation ◽  
Multiple Access ◽  
System Throughput ◽  
Total System ◽  
Proportional Fair ◽  
Weight Calculation ◽  
Scheduling Method ◽  
Proportional Fair Scheduling ◽  
High Level

A weighted proportional fair (PF) scheduling method is proposed in the context of nonorthogonal multiple access (NOMA) with successive interference cancellation (SIC) at the receiver side. The new scheme introduces weights that adapt the classical PF metric to the NOMA scenario, improving performance indicators and enabling new services. The distinguishing value of the proposal resides in its ability to improve long-term fairness and total system throughput while achieving a high level of fairness in every scheduling slot. Finally, it is shown that the additional complexity caused by the weight calculation has only a limited impact on the overall scheduler complexity, while simulation results confirm the claimed improvements, making the proposal an appealing alternative for resource allocation in a cellular downlink system.

scholarly journals Throughput Analysis for Non-Orthogonal Multiple Access (NOMA)-Based 5G Networks

2019 ◽  
Vol 8 (3S) ◽  
pp. 101-108
Keyword(s):  
Power Allocation ◽  
Interference Cancellation ◽  
Multiple Access ◽  
System Throughput ◽  
Superposition Coding ◽  
5G Networks ◽  
Throughput Analysis ◽  
Radio Access ◽  
5G Network ◽  
High System

Non-Orthogonal Multiple Access (NOMA) scheme is one of the emerging radio access techniques to enhance the system performance for 5G networks. The powerdomain NOMA is one of the basic NOMA schemes that perform superposition coding (SC) at the transmitter and successive interference cancellation (SIC) at the receiver. Power Allocation (PA) plays a significant role in attaining successful SIC and high system throughput. This work is focusing on power allocation to maximize the throughput for NOMA-based 5G network. The objective functions, algorithms, constraints and limitations of the system design in power allocation techniques for NOMA-based 5G networks in terms of throughput analysis are extensively investigated and reported.

scholarly journals Proportional fair scheduling method with QoS for the coexistence system of GFDM and OFDM

2017 ◽  
Vol 6 (7) ◽  
pp. 454-459
Author(s):  
Masanori Yofune ◽  
Masayuki Suto ◽  
Yasuharu Amezawa ◽  
Tatsuya Yoshioka ◽  
Nobuo Suzuki
Keyword(s):  
Proportional Fair ◽  
Fair Scheduling ◽  
Scheduling Method ◽  
Proportional Fair Scheduling

A Combined Fair Resource Scheduling and Adaptive Modulation Scheme for Clustered OFDMA Systems

2012 ◽  
Vol 198-199 ◽  
pp. 1578-1582
Author(s):  
Lin Huang ◽  
Nian Sheng Chen ◽  
Bai Yan Hu
Keyword(s):  
Scheduling Algorithm ◽  
Adaptive Modulation ◽  
Resource Scheduling ◽  
System Throughput ◽  
Modulation Scheme ◽  
Proportional Fair ◽  
Multiple Users ◽  
Modulation Mode ◽  
Selective Channel ◽  
Proportional Fair Scheduling

Orthogonal frequency division multiple access (OFDMA) is a promising technique for achieving high downlink capacities in next generation wireless communication system. An OFDM system has the advantage that multiple users can be scheduled at the same time in a frequency-selective channel. Proportional fair resource scheduling algorithm can guarantee the fairness among multiple users. Compared to the conventional fixed modulation, link adaptation modulation can select the most appropriate modulation scheme on each sub-carrier according to the current link qualify, this can be used to enhance system throughput. However, the overhead cost of feeding back channel state and modulation mode information of every sub-carrier for every user is very high. Cluster feedback scheme can greatly reduce the feedback overhead. In this paper, based on cluster feedback, an adaptive modulation with proportional fair scheduling algorithm is proposed. The analysis and simulation result verify that the introduced scheme is effective in improving system throughput and has fairness among users.

Integrated Analysis for Long-Term Degradation of Waste Package at the Potential Yucca Mountain Repository for High-Level Nuclear Waste Disposal

2002 ◽  
Vol 713 ◽  
Author(s):  
Joon H. Lee ◽  
Kevin G. Mon ◽  
Dennis E. Longsine ◽  
Bryan E. Bullard ◽  
Ahmed M. Moniba
Keyword(s):  
Corrosion Rate ◽  
Nuclear Waste ◽  
Yucca Mountain ◽  
Integrated Analysis ◽  
Total System ◽  
General Corrosion ◽  
Waste Package ◽  
High Level Nuclear Waste ◽  
High Level

ABSTRACTThe technical basis for Site Recommendation (SR) of the potential repository for high-level nuclear waste at Yucca Mountain, Nevada has been completed. Long-term containment of the waste and subsequent slow release of radionuclides from the engineered barrier system (EBS) into the geosphere will rely on a robust waste package (WP) design, among other EBS components as well as the natural barrier system. The WP and drip shield (DS) degradation analyses for the total system performance assessment (TSPA) baseline model for the SR have shown that, based on the current corrosion models and assumptions, both the DSs and WPs do not fail within the regulatory compliance time period (10,000 years). From the perspective of initial WP failure time, the analysis results are encouraging because the upper bounds of the baseline case are likely to represent the worst case combination of key corrosion model parameters that significantly affect long-term performance of WPs in the potential repository. The estimated long life-time of the WPs in the current analysis is attributed mostly to the following two factors that delay the onset of stress corrosion cracking (SCC): (1) the stress mitigation to substantial depths from the outer surface in the dual closure-lid weld regions; and (2) the very low general-corrosion rate applied to the closure-lid weld regions to corrode the compressive stress zones. Uncertainties are associated with the current WP SCC analysis. These are stress mitigation on the closure-lid welds, characterization of manufacturing flaws applied to SCC, and general corrosion rate applied to the closurelid weld regions. These uncertainties are expected to be reduced as additional data and analyses are developed.

scholarly journals Analytical Evaluation of the Performance of Proportional Fair Scheduling in OFDMA-Based Wireless Systems

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Mohamed H. Ahmed ◽  
Octavia A. Dobre ◽  
Rabie K. Almatarneh
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Access ◽  
Scheduling Algorithm ◽  
Wireless Systems ◽  
Packet Delay ◽  
Frequency Division ◽  
Analytical Evaluation ◽  
Proportional Fair ◽  
High Data ◽  
Proportional Fair Scheduling

This paper provides an analytical evaluation of the performance of proportional fair (PF) scheduling in Orthogonal Frequency-Division Multiple Access (OFDMA) wireless systems. OFDMA represents a promising multiple access scheme for transmission over wireless channels, as it combines the orthogonal frequency division multiplexing (OFDM) modulation and subcarrier allocation. On the other hand, the PF scheduling is an efficient resource allocation scheme with good fairness characteristics. Consequently, OFDMA with PF scheduling represents an attractive solution to deliver high data rate services to multiple users simultaneously with a high degree of fairness. We investigate a two-dimensional (time slot and frequency subcarrier) PF scheduling algorithm for OFDMA systems and evaluate its performance analytically and by simulations. We derive approximate closed-form expressions for the average throughput, throughput fairness index, and packet delay. Computer simulations are used for verification. The analytical results agree well with the results from simulations, which show the good accuracy of the analytical expressions.

Risk-Based Evaluation of Long-Term Safety for a Yucca Mountain Repository Using the IMARC TSPA Code

2004 ◽  
Vol 824 ◽  
Author(s):  
John Kessler ◽  
Michael Apted ◽  
Matthew Kozak ◽  
Wei Zhou
Keyword(s):  
Radioactive Waste ◽  
System Performance ◽  
Yucca Mountain ◽  
Electric Power Research Institute ◽  
Performance Assessments ◽  
Total System ◽  
Spent Fuel ◽  
Waste Repository ◽  
High Level

AbstractThe Electric Power Research Institute (EPRI) has conducted independent total system performance assessments (TSPAs) of the proposed Yucca Mountain spent fuel and high-level radioactive waste repository for 15 years. EPRI uses its TSPA code, IMARC, currently in its eighth version. The major results of the IMARC-8 analyses are presented in this paper. In all of the situations evaluated by EPRI using IMARC-8, the results for the reference repository concept for Yucca Mountain are well within the regulatory criteria established in the applicable regulations, 10 CFR 63 and 40 CFR 197. Further analyses indicate that at least two of the repository barriers must fail to function as anticipated for dose risks to rise as much as one millirem per year (1/15th of the regulatory limit).

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