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In this paper, we propose two new power loading schemes for an OFDM cognitive radio (CR). The novelty of this paper is that the CR has no knowledge about the interference power introduced by primary users (PUs). In the first scheme, we maximize the total received signal power on all CR subcarriers as the objective function with the two constraints: (i) keeping the interference to the PUs below a given...
In this paper, we propose a new two phase algorithm to maximize the downlink throughput of a cognitive radio network (CRN) using OFDMA. Since we consider a multiuser CRN, subcarrier assignment should be performed for secondary (unlicensed) users. In Phase I of the proposed algorithm, first a coarse spectrum sensing and equal transmitted power allocation are considered and then subcarrier assignment...
We study the problem of optimizing the symbol error probability (SEP) performance of cluster-based cooperative wireless sensor networks (WSNs). It is shown in the literature that an efficient relay selection protocol based on simple geographical information of the nodes to execute the cooperative diversity transmission, can significantly improve the SEP performance at the destination of such networks...
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