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As energy consumption reduction has been an urgent problem for the wireless industry, energy-efficient communications is of prime interest for the design of future wireless networks. In this paper, we study the energy efficiency of relay-assisted cellular networks using tools of stochastic geometry where the relay is energy harvesting. We first derive the coverage probability for the macro base station...
We consider a two-hop non-regenerative (amplify-and-forward) relay link with one source, one destination and one relay, in which orthogonal frequency division multiplexing (OFDM) is used. The power allocation (PA) to maximize the energy efficiency for the whole link is investigated under quality of service (Qos) requirement and separate power constraints. An approximation method with low complexity...
In this paper, multi-user relay networks are considered. We formulate a multi-user relay network model where all the relay nodes amplify and forward the signals from the source nodes to the destination nodes. Then we define the metric of energy efficiency and prove the quasi-concavity of the expression for energy efficiency. Moreover, a bisection method is raised to solve the problems. Three schemes...
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