Energy‐efficiency maximisation for cooperative and non‐cooperative OFDMA cellular networks—a survey

In this survey, techniques to enhance energy efficiency EE in orthogonal frequency division multiple access OFDMA and orthogonal frequency division multiplexing OFDM systems, with or without the utilisation of the cooperative network paradigm, considering also the features provided in the standards of modern cellular wireless networks, such as LTE-Advanced and WiMAX, are discussed. For the non-cooperative EE maximisation case, we summarise resource allocation problems and also describe some techniques that can be combined with the basic power/subcarrier allocation problems. When considering the cooperative OFDMA case, we first discuss four basic variables that arise with the relay station implantation, and after that, other features are also listed, which can be combined with the previously discussed issues. Finally, we review some of the standardisation documents available for fourth-generation systems in order to obtain system parameters and simulation scenarios, discuss some methods to analyse and solve the optimisation problems that can be proposed with the aforementioned techniques and then point out important open trends and research challenges in the EE maximisation problem considering OFDMA scenario. Copyright © 2014 John Wiley & Sons, Ltd.

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