With 5G mobile communication systems having been commercially rolled out, research discussions on next generation systems, that is, 6G, have started. On the other hand, vehicular technologies are also evolving rapidly, from connected vehicles called V2X (vehicle to everything) autonomous combination of two, networks (CAV). How fast evolution these two areas will go hand-in-hand is great importa...

in this paper, downlink resource allocation for a sparse code multiple access (scma) based heterogeneous  cellular networks (hcn) is investigated. the main aim of this paper is to obtain joint power allocation and codebook assignment to achieve the least total system transmit power. in this regard, the proposed objective function is formulated as total transmit power subject to users minimum ra...

The widespread use of wireless cellular networks has made security an ever increasing concern. GSM is the most popular wireless cellular standard, but security is an issue. The most critical weakness in the GSM protocol is the use of one-way entity authentication, i.e., only the mobile station is authenticated by the network. This creates many security problems including vulnerability against m...

We characterize the ergodic spectral efficiency of a non-cooperative and a cooperative type of K-tier heterogeneous networks with limited feedback. In the non-cooperative case, a multi-antenna base station (BS) serves a single-antenna user using maximum-ratio transmission based on limited feedback. In the cooperative case, a BS coordination set is formed by using dynamic clustering across the t...

Since their introduction, Cellular Neural Networks 4] have turned out to be useful architectures for the solution of many problems, e. g. in image processing or in the simulation of partial diierential equations. Therefore, there have been several attempts to introduce cell circuits suitable for large-scale integration 3]. Up to now, all of these cells need energy and therefore power supply. Ju...