Over the past two decades, numerous research projects have concentrated on cognitive radio wireless sensor networks (CR-WSNs) and their benefits. To tackle the problem of energy and spectrum shortfall in CR-WSNs, this research proposes an underpinning decode-&-forward (DF) relaying technique. Using the suggested time-slot architecture (TSA), this technique harvests energy from a multi-antenna power beam (PB) and delivers source information to the target utilizing energy-constrained secondary source and relay nodes. The study considers three proposed relay selection schemes: enhanced hybrid partial relay selection (E-HPRS), conventional opportunistic relay selection (C-ORS), and leading opportunistic relay selection (L-ORS). We present evidence for the sustainability of the suggested methods by examining the outage probability (OP) and throughput (TPT) under multiple primary users (PUs). These systems leverage time switching (TS) receiver design to increase end-to-end performance while taking into account the maximum interference constraint and transceiver hardware inadequacies. In order to assess the efficacy of the proposed methods, we derive the exact and asymptotic closed-form equations for OP and TPT & develop an understanding to learn how they affect the overall performance all across the Rayleigh fading channel. The results show that OP of the L-ORS protocol is 16% better than C-ORS and 75% better than E-HPRS in terms of transmitting SNR. The OP of L-ORS is 30% better than C-ORS and 55% better than E-HPRS in terms of hardware inadequacies at the destination. The L-ORS technique outperforms C-ORS and E-HPRS in terms of TPT by 4% and 11%, respectively.
W artykule przedstawiono propozycję systemu zarządzania zaufaniem dla mobilnych sieci organizowanych doraźnie wyposażonych w funkcjonalność budowania wiedzy o otoczeniu na podstawie tzw. cyklu kognitywnego. System ten umożliwia obserwację ruchu sygnalizacyjnego przez poszczególne węzły oraz klasyfikację pozostałych węzłów, która wyznacza poziom zaufania do otoczenia. Dzięki odpowiedniej reakcji możliwe jest zwiększenie poziomu bezpieczeństwa w sieciach kognitywnych.
EN
The paper presents the reputation system for mobile cognitive radio ad-hoc networks. The system is able to recognize the attacks both on cognitive signaling and reputation system. Based on the appropriate nodes classification and reaction the security of the network is increased.
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