Abstract
In spectrum overlay approach, SUs coexists with PUs and share their spectrum. However, each SU has imposed transmit power constraint so as not to create any harmful interference to active PUs. The main goal of each SU is to maintain lower interference level than the specified tolerable level at PUs while sharing PUs’ licensed bands dynamically. To maintain low interference level, SUs must transmit with lower transmit power. Thus power control is essential for each SUs. In wireless communications, power control is performed to satisfy the specified minimum signal-to-interference-plus-noise (SINR) to get desired data rate [2, 7]. For voice communications, once target SINR level is met, there will be no improvement in voice quality by increasing power or SINR. However, for data communications, increase in SINR results in increase in data rate. Thus, SUs try to increases their SINR values by increasing their transmission powers while satisfying their imposed power constraints in data communications.
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Rawat, D.B., Song, M., Shetty, S. (2015). Resource Allocation in Spectrum Underlay Cognitive Radio Networks. In: Dynamic Spectrum Access for Wireless Networks. SpringerBriefs in Electrical and Computer Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-15299-8_2
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DOI: https://doi.org/10.1007/978-3-319-15299-8_2
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