2025. Special Issue

 

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MESSAGE FROM THE GUEST EDITOR

Péter Baranyi, Atsushi Ito, Ádám B. Csapó, Ildikó Horváth, and Tibor Guzsvinecz 
Joint Special Issue on Cognitive Infocommunications and Cognitive Aspects of Virtual Reality 
We are pleased to introduce this joint special issue focus ing on Cognitive Infocommunications (CogInfoCom) and Cognitive Aspects of Virtual Reality (cVR). Within this Issue a wide range of research results are presented, focusing on the complex relationship between human cognition and in formation and communication technologies (ICT), along with the revolutionary effects of virtual reality settings on cognitive functions.

 

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PAPERS FROM OPEN CALL

Zoltán Belső, and László Pap
Effect of the Imperfect Channel Estimation on Achievable NOMA Rate 
In recent years, Non-orthogonal Multiple Access (NOMA) has been proposed as an alternative to the more traditional Orthogonal Multiple Access (OMA) schemes for mobile communication. In the NOMA method, the resource domains (like power and bandwidth) are not split but shared between the users of the network. The non-orthogonality means that there is cross-talk between the signals of different users, and the interference is either cancelled by a method called successive interference cancellation (SIC) or treated as part of the noise. Comparing the achievable capacity region of OMA and NOMA schemes show that NOMA has advantage over OMA. The SIC method requires knowledge of the channel characteristic between the base station and the user. In the ideal case where all the channel conditions are precisely known, NOMA always performs better than or equal to OMA. In real application, the channel characteristic can only be estimated, which can be nonperfect. In this paper, we will examine the effect of non-perfect channel estimation on the performance of NOMA and will find that in some cases, NOMA still perform better than OMA, but in other cases OMA would perform better.

DOI: 10.36244/ICJ.2025.1.1
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