Cognitive Radio Energy Saving and Optimization

In an ad hoc cognitive radio network, energy management is of paramount importance, as it directly determines the lifetime of the cognitive radio as well as the interferences to the licensed users for which the regulatory obligations of cognitive radios must be fulfilled. When the transmission power is fixed, this boils down to the management of the cognitive radio operation time consisting of a dedicated sensing period and a transmission period. In this chapter, different energy saving techniques that use non-coherent sensing, decision-feedback sensing, or censored sensing to reduce the amount of total energy consumption incurred by sensing will be investigated. We will also look into energy optimization techniques that minimize the energy use by taking the physical layer sensing and upper layer throughput into account. Extensive analysis and simulation will be provided to obtain useful guidance on energy management in ad hoc cognitive radio networks.

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