Power Allocation and Spectrum Sharing in Multi-User, Multi-Channel Systems
As wireless communication devices become more pervasive, the demand for the frequency spectrum that serves as the underlying medium grows. Traditionally, the problem of allocating the resource of the frequency spectrum has been handled by granting organizations and companies licenses to broadcast at certain frequencies. This rigid approach leads to significant under-utilization of this scarce resource. Moreover, frequency utilization varies significantly with time and location. A cognitive radio is a wireless communication device that is aware of its capabilities, environment, and intended use, and can also learn new waveforms, models, or operational scenarios . Recently, the Federal Communications Commission (FCC) has established rules (see ) that describes how cognitive radios can lead to more efficient use of the frequency spectrum. These rules along with the cognitive radio’s features and the fact that information in the wireless network is decentralized and users may be strategic give rise to a wealth of important and challenging research issues associated with power allocation and spectrum sharing.
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