Browsing by Author "Sadi, Yalçın"
Now showing items 1-4 of 4
-
The Effect of Codebook Design on the Conventional SCMA System Performance
Authors:
Publisher and Date:(IEEE, 2020)In 4G systems, Orthogonal Frequency-Division Multiple Access (OFDMA) has been used conventionally for multiple access purposes. This technique has low spectral efficiency since it allocates the resources orthogonally to each user. As an alternative to this technique, Non-orthogonal Multiple Access (NOMA) has been proposed for new generation systems as it allows different users to use the same resources and therefore, increases spectral efficiency. Sparse Code Multiple Access (SCMA) is a code-based ...
-
Machine type communications: key drivers and enablers towards the 6G era
Authors:
Publisher and Date:(SPRINGER, 2021)The recently introduced 5G New Radio is the first wireless standard natively designed to support critical and massive machine type communications (MTC). However, it is already becoming evident that some of the more demanding requirements for MTC cannot be fully supported by 5G networks. Alongside, emerging use cases and applications towards 2030 will give rise to new and more stringent requirements on wireless connectivity in general and MTC in particular. Next generation wireless networks, namely ...
-
QoS-Constrained Semi-Persistent Scheduling of Machine-Type Communications in Cellular Networks
Authors:
Publisher and Date:(IEEE, 2019)The dramatic growth of machine-to-machine (M2M) communication in cellular networks brings the challenge of satisfying the quality of service (QoS) requirements of a large number of M2M devices with limited radio resources. In this paper we propose an optimization framework for the semi-persistent scheduling of M2M transmissions based on the exploitation of their periodicity with the goal of reducing the overhead of the signaling required for connection initiation and scheduling. The goal of the ...
-
Scheduling and Relay Selection for Full-Duplex Wireless Powered Cooperative Communication Networks
Authors:
Publisher and Date:(Institute of Electrical and Electronics Engineers Inc., 2020)In this manuscript, we consider a full-duplex wireless powered cooperative communication system where the users communicate with a hybrid access point through relays. We formulate an optimization problem with the objective to minimize the total transmission time through user scheduling and relay selection while considering the traffic demand, energy causality and initial battery levels of the users. The formulated optimization problem is a mixed integer non-linear programming problem, hence difficult ...
