scholarly journals Optimization Algorithms for Joint Power and Sub-Channel Allocation for NOMA-Based Maritime Communications

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1454
Author(s):  
Huanyu Li ◽  
Hui Li ◽  
Youling Zhou
Keyword(s):  
Performance Optimization ◽  
Channel Model ◽  
Channel Allocation ◽  
Achievable Rate ◽  
Joint Power ◽  
Basic Module ◽  
Polynomial Time Approximation Algorithm ◽  
Gradient Descent Algorithm ◽  
Knapsack Algorithm ◽  
Optimization Schemes

This paper investigates resource optimization schemes in a marine communication scenario based on non-orthogonal multiple access (NOMA). According to the offshore environment of the South China Sea, we first establish a Longley–Rice-based channel model. Then, the weighted achievable rate (WAR) is considered as the optimization objective to weigh the information rate and user fairness effectively. Our work introduces an improved joint power and user allocation scheme (RBPUA) based on a single resource block. Taking RBPUA as a basic module, we propose three joint multi-subchannel power and marine user allocation algorithms. The gradient descent algorithm (GRAD) is used as the reference standard for WAR optimization. The multi-choice knapsack algorithm combined with dynamic programming (MCKP-DP) obtains a WAR optimization result almost equal to that of GRAD. These two NOMA-based solutions are able to improve WAR performance by 7.47% compared with OMA. Due to the high computational complexity of the MCKP-DP, we further propose a DP-based fully polynomial-time approximation algorithm (DP-FPTA). The simulation results show that DP-FPTA can reduce the complexity by 84.3% while achieving an approximate optimized performance of 99.55%. This advantage of realizing the trade-off between performance optimization and complexity meets the requirements of practical low-latency systems.

Modeling and Optimization Design of Signal Interconnect Channel Considering Signal Integrity in Three Dimensional Integrated Circuits

2021 ◽  
Vol 16 (5) ◽  
pp. 773-780
Author(s):  
Bing-Jie Li ◽  
Zhen-Song Li ◽  
Yan-Ping Zhao ◽  
Zheng-Wang Li ◽  
Min Miao
Keyword(s):  
Performance Optimization ◽  
High Speed ◽  
Optimization Design ◽  
Channel Model ◽  
Transmission Loss ◽  
Coupling Effect ◽  
Signal Integrity ◽  
Signal Transmission ◽  
Equivalent Circuit Model ◽  
Transmission Performance

The signal integrity (SI) analysis of a high-speed signal interconnect channel composed of through silicon vias (TSVs) and horizontal re-distribution layers (RDL) is carried out, and the problems of SI, such as transmission loss, crosstalk and coupling effect in the transmission channel, are analyzed and studied. These signal integrity issues are considered in this paper, a signal interconnect channel model is proposed and the equivalent circuit model is deduced as well. Compared with the traditional one, this interconnect channel model has better performance in SI. Further sweep frequency analysis is carried out for different material parameters to achieve signal transmission performance optimization aimed at this model. Test samples of the proposed signal interconnect channel model are designed and fabricated according to the process index, and measured to verify the actual transmission performance. The design and optimization rule of high-speed signal interconnect channel are summarized which proved that the proposed structure has more advantages in signal transmission performance, and has important guiding significance for practical design.

Session and Network Support for Autonomous Context-Aware Multiparty Communications in Heterogeneous Mobile Systems

2010 ◽  
Vol 1 (4) ◽  
pp. 1-24 ◽  
Author(s):  
Josephina Antoniou ◽  
Christophoros Christophorou ◽  
Augusto Neto ◽  
Susana Sargento ◽  
Filipe Pinto ◽  
...  
Keyword(s):  
Mobile Devices ◽  
Performance Optimization ◽  
Network Performance ◽  
Future Internet ◽  
Mobile Systems ◽  
Context Aware ◽  
Network Support ◽  
Different Types ◽  
Optimization Schemes ◽  
Service Groups

The increase of networking complexity requires the design of new performance optimization schemes for delivering different types of sessions to users under different conditions. In this regard, special attention is given to multi-homed environments, where mobile devices cross areas with overlapping access technologies (Wi-Fi, 3G, WiMax). In such a scenario, efficient multiparty delivery depends upon the grouping operation, which must be done based on several parameters. In this paper, the authors propose context-aware sub-grouping of content-based service groups so that the same service session can be delivered using different codings of the same content, adapting to current network, users, session, and environment context. The context-aware information is used to improve the sub-grouping process. This paper aims to describe these sub-grouping techniques, and in particular how they improve network performance and user experience in the future Internet by focusing on the improved network-level and session-level mechanisms.

scholarly journals Joint Power Control and Channel Allocation for Interference Mitigation Based on Reinforcement Learning

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 177254-177265 ◽  
Author(s):  
Guofeng Zhao ◽  
Yong Li ◽  
Chuan Xu ◽  
Zhenzhen Han ◽  
Yuan Xing ◽  
...  
Keyword(s):  
Reinforcement Learning ◽  
Power Control ◽  
Interference Mitigation ◽  
Channel Allocation ◽  
Joint Power ◽  
Joint Power Control

scholarly journals A Two-Stage Energy-Efficient Approach for Joint Power Control and Channel Allocation in D2D Communication

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 16940-16951 ◽  
Author(s):  
Sihan Liu ◽  
Yucheng Wu ◽  
Liang Li ◽  
Xiaocui Liu ◽  
Weiyang Xu
Keyword(s):  
Power Control ◽  
Energy Efficient ◽  
Channel Allocation ◽  
D2d Communication ◽  
Two Stage ◽  
Joint Power ◽  
Efficient Approach ◽  
Joint Power Control

Experimental Research on Performance Optimization of Solar-Air Source Heat Pump Water Heater

2013 ◽  
Vol 664 ◽  
pp. 1002-1006 ◽  
Author(s):  
Zhen Ya Zhang ◽  
Fang Wang ◽  
Wei Feng Da ◽  
Chao Guo
Keyword(s):  
Theoretical Analysis ◽  
Heat Pump ◽  
Performance Optimization ◽  
System Structure ◽  
Water Heater ◽  
Climate Conditions ◽  
Air Source Heat Pump ◽  
Heat Pump Water Heater ◽  
Test Feasibility ◽  
Optimization Schemes

A practical indirect expansion solar-air source heat pump water heater (IESASHPWH) is used as the measured object. Several feasible performance optimization schemes are proposed in this paper through the fundamental performance and theoretical analysis of the system structure. Then several tests are conducted to test feasibility of the schemes and effect of performance optimization of the schemes through simulating different temperature and climate conditions.

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