Jerzy Martyna

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We consider a cognitive radio network in which a set of primary users make opportunistic spectrum access to support cognitive radios within their coverage areas. In cognitive radio networks, all cognitive radios compete for radio resources and can interfere with each other. The conflicting objectives of users make it highly unlikely for any user to gain(More)
Real-time systems, especially software control systems, are developed to meet the requirements of real-time automation systems. One such crucial requirement is reducing the delay and jitter of periodic tasks in such systems. In this paper, we present a new method for reducing delays and jitters of periodic tasks, which are enforced by the operating system,(More)
The paper provides the optimal power allocation in two-tier multi-antenna cognitive femtocell radio networks. The multiple antennas are used to serve a dual objective: avoid the interference and enhance throughput via multi-input multi-output (MIMO) transmission towards the receivers. A method is presented in order to achieve the optimal power allocation(More)
Energy-efficient green communication techniques are of special importance for cognitive radio networks (CRNs) in order to reduce carbon dioxide gas emission. This paper proposes an efficient algorithm for power control with QoS guarantee in the underlay green CRNs. The proposed algorithm allows us to underlay resource sharing where both primary users (PUs)(More)