Downlink Resource Allocation in OFDMA using HPSOGA AND HGAPSO
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Abstract
Resource allocation is very essential at the base station (BS) to have a fair allocation of resources among the users. Orthogonal Frequency Division Multiple Access (OFDMA) allows many users to transmit simultaneously on different subchannels per Orthogonal Frequency Division Multiplexing (OFDM) symbol. The system capacity of downlink OFDMA system can be maximized by adaptively assigning subchannels to the user with the best possible gain using hybrid particle swarm optimization and genetic algorithm (HPSOGA). PSO and GA are combined in a sequential manner resulting in two different techniques namely HPSOGA and HGAPSO. The idea behind the hybrid algorithm is to use PSO to generate initial population of GA and vice-versa. Simulation results show that HPSOGA and HGAPSO provide capacity improvement over PSO. Among the two hybrid models, compared to the PSO method HGAPSO provides improvement in fairness with respect the users.
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References
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[2] Ahmed I, Majunder SP, Adaptive resource allocation based on modified genetic algorithm and particle swarm optimization for multiuser OFDM systems, International Conference on Electrical and Computer Engineering, 211-216. 2008
[3] Liu B, Jiang M, Yuan D, Adaptive resource allocation in multiuser OFDM system based on genetic algorithm, WRI International Conference on Communications and Mobile Computing, 270-273 2009
[4] Chatzifotis I, Tsagkaris K, Demestichas K, Ant colony optimization for subcarrier allocation in OFDMA-based wireless systems, Conference on ICT-Mobile Summit, 1-9. 2009
[5] Zhou N, Zhu X, Huang Y. , Genetic algorithm based cross-layer resource allocation for wireless OFDM networks with heterogeneous traffic, 17th European Signal Processing Conference, 1656-1659. 2009
[6] Sharma N, Anupama KR, A novel genetic algorithm for adaptive resource allocation in multiuser OFDM systems with proportional rate constraint., International Journal of Recent Trends in Engineering, 135-139. 2009
[7] Sadr S, Anpalagan A, Raahemifar K, Suboptimal rate adaptive resource allocation for downlink OFDMA systems, International Journal of Vehicular Technology , 1-10. 2009
[8] Ahmedi H, Chew YH, Subcarrier-and-bit allocation in multiclass multiuser single-cell OFDMA systems using an ant colony optimization based evolutionary algorithm, IEEE Wireless Communications and Networking Conference 1–5 2010
[9] Ahmed I, Sadeque S, Pervin S, Margin adaptive resource allocation for multiuser OFDM systems by modified particle swarm optimization and differential evolution, International conference on electrical communications and computers. 227-231. 2011
[10] Yi Y, Qin Yu Z, Ye W , Modified particle swarm optimization and genetic algorithm based adaptive resources allocation algorithm for multiuser orthogonal frequency division multiplexing system, Information Technology Journal, vol.10, 955-964. 2011
[11] Rahman AU, Mansoor I, Qureshi, Malik AN, Adaptive resource allocation in OFDM systems using GA and fuzzy rule base system, World Applied Sciences Journal, vol.18, 836-844. 2012
[12] Sharma N, Anand KT, Thomas VA, Anupama KR, On the use of particle swarm optimization for adaptive resource allocation in OFDMA systems with proportional rate constraints, Information Sciences Journal. vol. 182, 115-124 2012