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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...
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