access icon free Efficiency and fairness aware resource allocations for energy and spectrum in downlink OFDMA systems

Energy has newly become a scarcer resource for the wireless networks, like spectrum. To utilise the limited resources efficiently and fairly in the downlink OFDMA systems, a novel resource allocation problem is investigated to make the balance between energy efficiency (EE) and spectrum efficiency (SE), the tradeoff between fairness and SE/EE. The problem is first formulated as an optimisation problem, which is NP-hard. Then, the existence of an optimal solution is proved, and an algorithm is designed to obtain the optimal solution. Finally, the numerical results show that the proposed algorithm achieves the SE–EE balance and provides a good tradeoff between fairness and SE/EE.

Inspec keywords: frequency division multiple access; optimisation; OFDM modulation; resource allocation; computational complexity

Other keywords: downlink OFDMA systems; SE-EE; energy; spectrum efficiency; NP-hard; fairness aware resource allocations; downlink orthogonal frequency division multiple access systems; wireless networks; optimisation problem

Subjects: Modulation and coding methods; Optimisation techniques; Radio links and equipment; Multiple access communication

References

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      • 3. Xiong, C., Li, G.Y., Zhang, S.: ‘Energy-efficient resource allocation in OFDMA networks’. IEEE GLOBECOM 2011, Houston, TX, USA, December 2011.
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      • 6. ITU-R M.2135–1.: ‘Guidelines for evaluation of radio interface technologies for IMT-Advanced’, 2009.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2013.2121
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