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Secondary users (SUs) should have power constraints because primary users (PUs) should not be interfered by SUs in cognitive radio (CR) network. Therefore it is important for SUs to maximize throughput and ensure quality of service (QoS) on the premise of generating no interference to PUs. In this paper, SUs are equipped with multiple antennas. Multiple-input multiple-output (MIMO) wireless communication...
This paper outlines the application of the heuristic Harmony Search (HS) algorithm for efficient spectrum allocation in cognitive radio networks under a minimum Bit Error Rate (BER) criterion. Our proposed algorithm provides a higher degree of diversity in the search process by virtue of its particular improvisation procedure, as opposed to evolutionary computation techniques used so far for this...
In this paper, we consider an underlay cognitive radio network consisting of a primary transmitter (PT), a primary receiver (PR), a secondary transmitter (ST) and a secondary receiver (SR). We propose a two time slot spectrum sharing scheme based on cooperative relay transmission in addition to a practical design of the antenna weights at the ST to achieve high performance at the primary and the secondary...
Cognitive radios have the ability to efficiently utilize the spectrum, by intelligently sensing absence of licensed users and transmitting signal through the frequency bands that are not occupied. Spatial diversity techniques at the cognitive base station could further help in controlling the interference temperature levels of the licensed users when signals are transmitted to unlicensed users. This...
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