Joint power control and user grouping for uplink power domain non-orthogonal multiple access

2021 ◽  
Vol 17 (12) ◽  
pp. 155014772110574
Author(s):  
Bilal Ur Rehman ◽  
Mohammad Inayatullah Babar ◽  
Arbab Waheed Ahmad ◽  
Hesham Alhumyani ◽  
Gamil Abdel Azim ◽  
...  
Keyword(s):  
Computational Complexity ◽  
Power Control ◽  
Communication Networks ◽  
Multiple Access ◽  
High Speed ◽  
Performance Enhancement ◽  
Joint Power ◽  
User Pairing ◽  
Multiple User ◽  
Power Domain

Orthogonal multiple access schemes based on assignment of communication resource blocks among multiple contenders, although widely available, still necessitate an upper limit on the number of concurrent users for minimization of multiple-user interference. The feature thwarts efforts to cater for pressing connectivity demands posed by modern-day cellular communication networks. Non-orthogonal multiple access, regarded as a key advancement towards realization of high-speed 5G wireless communication networks, enables multiple users to access the same set of resource blocks non-orthogonally in terms of power with controllable interference, thereby allowing for overall performance enhancement. Owing to the combinatorial nature of the underlying optimization problem involving user pairing/grouping scheme, power control and decoding order, the computational complexity in determining optimal and sub-optimal solutions remains considerably high. This work proposes three novel alternative approaches (Randomly, 2-Opt and Hybrid) for arriving at a near-optimal solution for the problem of user pairing/grouping. The algorithms not only offer reduced computational complexity but also outperform orthogonal multiple access and existing schemes reported in the literature for uplink non-orthogonal multiple access systems.

Performance Enhancement of Encoding–Decoding Multidiagonal and Walsh Hadamard Codes for Spectral Amplitude Coding-Optical Code Division Multiple Access (SAC-OCDMA) Utilizing Dispersion Compensated Fiber

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Majidah H. Majeed ◽  
Riyadh Khlf Ahmed
Keyword(s):  
Multiple Access ◽  
Performance Enhancement ◽  
Optical Network ◽  
Spectral Amplitude ◽  
Q Factor ◽  
Data Traffic ◽  
Eye Diagram ◽  
Multiple User ◽  
Spectral Amplitude Coding ◽  
Code Division Multiple

AbstractSpectral Amplitude Coding-Optical Codes Division Multiple Access (SAC-OCDMA) is a future multiplexing technique that witnessed a dramatic attraction for eliminating the problems of the internet in optical network field such as multiple-user access and speed’s growth of the files or data traffic. In this research article, the performance of SAC-OCDMA system based on two encoding–decoding multidiagonal (MD) and Walsh Hadamard (WH) codes is enhanced utilizing three different schemes of dispersion compensating fiber (DCF): pre-, post- and symmetrical compensation. The system is simulated using Optisystem version 7.0 and Optigrating version 4.2. The performance of the proposed system is specified in terms of bit error rate (BER), Q-factor and eye diagram. It has been observed that the compensated system based on MD code is performs much better compared to the system based on WH code. On the other hand, the compensated SAC-OCDMA system with symmetrical DCF has the lowest values of BER and largest values of Q-factor, so it is considered the best simulated scheme contrasted with pre- and post-DCF.

scholarly journals The Application of Power-Domain Non-Orthogonal Multiple Access in Satellite Communication Networks

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 63531-63539 ◽  
Author(s):  
Xiaojuan Yan ◽  
Kang An ◽  
Tao Liang ◽  
Gan Zheng ◽  
Zhiguo Ding ◽  
...  
Keyword(s):  
Communication Networks ◽  
Multiple Access ◽  
Satellite Communication ◽  
Power Domain

Joint User Pairing, Mode Selection, and Power Control for D2D-Capable Cellular Networks Enhanced by Nonorthogonal Multiple Access

2019 ◽  
Vol 6 (5) ◽  
pp. 8919-8932 ◽  
Author(s):  
Daosen Zhai ◽  
Ruonan Zhang ◽  
Yutong Wang ◽  
Huakui Sun ◽  
Lin Cai ◽  
...  
Keyword(s):  
Power Control ◽  
Cellular Networks ◽  
Multiple Access ◽  
Mode Selection ◽  
User Pairing ◽  
Pairing Mode

scholarly journals Code Domain Non- Orthogonal Multiple Access Schemes for 5G and Beyond Communication Networks: A Review

2021 ◽  
Author(s):  
Aasheesh Shukla ◽  
◽  
Manish Kumar ◽  
Vinay Kumar Deolia ◽  
◽  
...  
Keyword(s):  
Communication Networks ◽  
Multiple Access ◽  
Heterogeneous Data ◽  
Data Traffic ◽  
5G Networks ◽  
Comprehensive Overview ◽  
Power Domain ◽  
Rate Splitting ◽  
Code Domain ◽  
Multiple Access Schemes

Future communication networks may encounter various issues in order to facilitate heavy heterogeneous data traffic and large number of users, therefore more advanced multiple access (MA) schemes are being developed to meet the changing requirements. The research space on making more robust MA scheme is continuously increasing, so it becomes significant to analyze the various schemes to determine the appropriate MA scheme for 5G networks. Therefore, in this paper the comprehensive overview of the most popular and recent MA schemes is presented for 5G networks. This paper mainly classifies the MA techniques in orthogonal MA (OMA) and various types of non-OMA (NOMA) techniques. Specifically, we introduce RSMA (Rate splitting multiple access) and IDMA (interleave division multiple access). Further the close attention is paid to NOMA family, including code-domain NOMA (e.g., SCMA (sparse code multiple access)), power-domain NOMA. Above all, from this exploration, the opportunities and challenges could be notified in MA schemes and further the optimum MA technique can be point out among discussed MA schemes for 5G and beyond communication networks.

scholarly journals Joint Power Control and Beamforming for Uplink Non-Orthogonal Multiple Access in 5G Millimeter-Wave Communications

2018 ◽  
Vol 17 (9) ◽  
pp. 6177-6189 ◽  
Author(s):  
Lipeng Zhu ◽  
Jun Zhang ◽  
Zhenyu Xiao ◽  
Xianbin Cao ◽  
Dapeng Oliver Wu ◽  
...  
Keyword(s):  
Power Control ◽  
Millimeter Wave ◽  
Multiple Access ◽  
Joint Power ◽  
Joint Power Control ◽  
Millimeter Wave Communications

scholarly journals A Comprehensive Realization of Resource Spread Multiple Access / NOMA Performances in 5G

2020 ◽  
Vol 9 (4) ◽  
pp. 949-954
Keyword(s):  
Outage Probability ◽  
Communication Networks ◽  
Interference Cancellation ◽  
Multiple Access ◽  
High Performance ◽  
Simulation Analysis ◽  
Base Stations ◽  
Free Access ◽  
Spectrum Utilization ◽  
Power Domain

Since 4G has limited in capacity, restricted in resource utilization, reasonable latency and so on. In order to yield high performance factors of the above-said, a Non Orthogonal Multiple Access (NOMA) plays an important role in 5G communication networks. The NOMA is otherwise called as Resource Spread Multiple Access (RSMA), whose performance is quite fit while envisioned for the forthcoming communication (i.e., 5G and above), which fulfil the requirements of the current 5th Generation, in view of capacity improvement, power allocation, lower latency, outage probability for both uplink and downlink configurations. This paper gets into the analytical and simulation analysis of the power domain NOMA technique to two users case on sum capacity and outage power probability for conventional un-ordered (not fixed) and ordered (fixed). Based on the position of the users as near base stations and cell edges are analyzed, subjected not to compromise the quality of service (QoS), maximize the spectrum utilization, out-and-out resource allocation, good energy efficiency and so on. Here an interesting view on both the channel gain and SNR are possessed higher degree of consent on outage power and successive interference cancellation. When the channel gains are equal on both the users, correspondingly SNR and outage probability varies. On the other hand, when the gain of the weaker user channel is higher than the gain of the stronger user channel, then a cross over point arises significantly. Moreover, the Successive Interferences Cancellation (SIC) has increased by reducing the Signal to Noise ratio (SNR) and vice versa. This ideology is suited for the applications of 5G requiring asynchronous and grant-free access like IOT and mission critical control.

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