Comparative analysis of various code domain NOMA schemes for future communication networks

2021 ◽  
Author(s):  
Aasheesh Shukla
Keyword(s):  
Comparative Analysis ◽  
Communication Networks ◽  
Code Domain

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 Intelligent reflected surfaces assisted code domain non-orthogonal multiple access scheme

2021 ◽  
Vol 72 (5) ◽  
pp. 343-347
Author(s):  
Aasheesh Shukla
Keyword(s):  
Communication Networks ◽  
Information Transfer ◽  
Multiple Access ◽  
Wireless Communication Networks ◽  
Radio Waves ◽  
Reflection And Refraction ◽  
Access Scheme ◽  
Code Domain ◽  
Efficient Code ◽  
Phase Amplitude

Abstract The propagation medium plays a crucial role in any wireless communication networks, the channel between the transmitter and the receiver, deteriorate the quality of the received signal due to the uncontrollable interactions such as scattering, reflection, and refraction in the channel with the surrounding objects. To overcome this challenge, the recent advent of recongurable intelligent surfaces can be helpful, in which the network operators can control the radio waves, eg, the phase, amplitude, frequency, and even polarization, of the impinging signals without the need of complex decoding, encoding, and radio frequency processing operations. On the other hand, few research papers reported an efficient code domain non orthogonal multiple access (NOMA) such as Interleave division multiple access (IDMA) system for wireless information transfer. Persuaded by the capability of this arising RIS technology, the present article is aimed to provide the modified framework of IDMA (code-domain NOMA) communication system based on RIS technology. Simulation results demonstrate that the proposed system achieves better SNR performance than the conventional IDMA framework.

scholarly journals Comparative Analysis of Signal Strength of Some Cellular Networks in Port Harcourt, Nigeria.

2018 ◽  
Vol 2 (6) ◽  
Author(s):  
Bodunrin Isa Bakare ◽  
T. E. Ngeri ◽  
Sunny Orike
Keyword(s):  
Comparative Analysis ◽  
Cellular Networks ◽  
Communication Networks ◽  
Measurement Data ◽  
Path Loss ◽  
Signal Strength ◽  
Received Signal Strength ◽  
Least Square ◽  
Port Harcourt ◽  
Rivers State

This paper presents a comparative analysis of the Received Signal Strength (RSS) measurement of some cellular networks in Port Harcourt, Nigeria. Measurements were carried out using Radio Frequency Signal Tracker to determine received signal of three selected Global System for Mobile Communication networks (MTN, Airtel and Globalcom) at five strategic locations (Borokiri, Old Government Residential Area, Rivers State University, Ikwerre Road and Aba Road) in Port Harcourt, Rivers State. From the results obtained it shows that in Borokiri MTN has the highest received signal strength of -61.9dBm, Old GRA Airtel has the highest received signal strength of -61.3dBm, RSU and Ikwerre Road Globalcom has the highest received signal strength of -68.3dBm and -64.9dBm respectively while for Aba Road MTN has the highest received signal strength of -63.0dBm. In all the measurements, the results were analyzed using least square method and standard deviation to approximate the measurement data and path loss model was developed using ordinary least square regression technique.

Definition of General Requirements for Graph Visualization Software

2009 ◽  
Vol 38 (38) ◽  
pp. 168-179
Author(s):  
Vitaly Zabiniako ◽  
Pavel Rusakov
Keyword(s):  
Comparative Analysis ◽  
Communication Networks ◽  
Traffic Control ◽  
Information Sources ◽  
Graph Visualization ◽  
Tabular Form ◽  
Visualization Software ◽  
Main Components ◽  
Definition Of ◽  
General Graphs

Definition of General Requirements for Graph Visualization SoftwareThis paper contains comparative analysis of some modern graph visualization packages (for example, "Graphviz", "yFiles", "Wilmascope 3D", etc) in order to outline and characterize general requirements that could be useful for development of new graph visualization software (GVS). Relations between identified requirements and necessary related components of potential GVS are being derived. To precise these requirements there were studied an additional theoretical information sources. The main goal of this research is to improve development of new GVS providing mechanism of design templates for different kinds of tasks (for example - visualization of general graphs, diagrams, routing and communication networks, etc). The result of this research is presented in tabular form. That allows identifying the set of main components of new frameworks at early stages of software development (starting with a list of desired features and transforming it into a list of necessary components). An example of using such table in DBMS MS Access environment is provided in a study of development of imaginary GVS as a part of generic air traffic control routing system. There is made conclusion about the achieved results. It is presented information about future researches in this field.

scholarly journals Comparative analysis of layered structures in empirical investor networks and cellphone communication networks

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Peng Wang ◽  
Jun-Chao Ma ◽  
Zhi-Qiang Jiang ◽  
Wei-Xing Zhou ◽  
Didier Sornette
Keyword(s):  
Comparative Analysis ◽  
Communication Networks ◽  
Layered Structures

scholarly journals Asynchronous Flipped Grant-Free SCMA for Satellite-Based Internet of Things Communication Networks

2019 ◽  
Vol 9 (2) ◽  
pp. 335 ◽  
Author(s):  
Pengxu Li ◽  
Gaofeng Cui ◽  
Weidong Wang
Keyword(s):  
Internet Of Things ◽  
Communication Networks ◽  
Interference Cancellation ◽  
Multiple Access ◽  
Satellite Communication ◽  
Time Synchronization ◽  
Sliding Window ◽  
Loss Ratio ◽  
Access Scheme ◽  
Code Domain

Sparse code multiple access (SCMA) is a promising code domain non-orthogonal multiple-access scheme which is able to support massive connectivity and grant-free transmission in future satellite-based Internet of Things (IoT) communication networks. Traditional grant-free SCMA is based on time synchronization, which is no longer favorable in such satellite communication networks since the amount of signaling generated to keep all transmitters’ time synchronized is impractical for large networks. Moreover, without centralized codebook assignment, grant-free SCMA suffers from codebook collisions which mean more than one terminal selecting the same codebook being interfered. Motivated by these issues, a novel uplink grant-free asynchronous flipped SCMA scheme named AF-SCMA is proposed in this paper. With the concept of flipped diversity, a specific SCMA-encoded packet is transmitted with its flipped replica together. Successive interference cancellation technique combined with a sliding window is adopted to resolve the packet collisions including codebook collisions at the gateway station. The performance of AF-SCMA is investigated via both mathematical analysis and simulations. Simulation results show that the proposed AF-SCMA provides remarkable performance in terms of throughput and packet loss ratio (PLR), and can benefit from the received signal power unbalance.

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