A Survey on Efficient Power allocation for OFDM – Based Cognitive Radio Systems
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چکیده
A traditional design for Cognitive Radio (CR) systems using Orthogonal Frequency Division Multiplexing (OFDM) – is mainly concentrate on throughput of the system, but in today Energy Efficiency (EE) of wireless networks become more and more significant. The interference between the licensed and unlicensed users is a major problem in the cognitive radio systems. On the way to avoid this several power allocation schemes have been developed to make best use of the broadcasting rate of CR user while maintaining the total interference introduced to the PU band below a threshold and the entirety power within a account. Dynamic spectrum management is used in CR networks. In this paper we present the different types of algorithms that are used to get better the allocation power in OFDM – based Cognitive Radio (CR) Systems.
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تاریخ انتشار 2016