Title :
A novel heuristic method for resource allocation in downlink OFDMA systems: Context IEEE 802.16 m
Author :
Ben Hassen, Wafa ; Afif, M. ; Khelifa, Fakhreddine ; Samet, Ahmed
Author_Institution :
Nat. Inst. of Appl. Sci. & Technol., Univ. of Carthage, Tunis, Tunisia
Abstract :
In this paper we have proposed a new heuristic method for subchannels allocation problem in the context of WiMAX release 2.0, IEEE 802.16m. In this system, OFDM transmission method has been used, in order to reduce the effect of multipath fading and OFDMA in order to achieve multiple access schemes and flexibility in resource allocation. An adaptive method for subchannels allocation is necessary in order to exploit the multiuser diversity, to respect real time constraints and to maximize the capacity system. The proposed algorithm is based in the channel state information (CSI) of total mobiles stations present in the cell. The idea of this method is based in the statistic parameters, mean, variance, root mean square or RMS of the gain of frequency response channel for every mobile station. These parameters are the key to organize the different MS´s and subchannels priority. Numerical results show that the proposed algorithm outperforms an allocation scheme in terms of Bloc Error Rate, higher system capacity and fairness among active users, compared to others previous methods.
Keywords :
OFDM modulation; WiMax; diversity reception; fading channels; frequency division multiple access; frequency response; mean square error methods; multi-access systems; multipath channels; multiuser channels; resource allocation; CSI; MS; RMS; WiMax; bloc error rate; channel state information; context IEEE 802.16m; downlink OFDMA system; frequency response channel; heuristic method; higher system capacity; mobile station; multipath fading; multiple access schemes; multiuser diversity; resource allocation; root mean square; statistic parameters; subchannel allocation problem; Algorithm design and analysis; Downlink; Interference; Mobile communication; Resource management; Signal to noise ratio; Throughput; Dynamic Resource Allocation; Fast Fading; Multiuser Diversity; OFDMA; Subchannel;
Conference_Titel :
Communications, Computing and Control Applications (CCCA), 2011 International Conference on
Conference_Location :
Hammamet
Print_ISBN :
978-1-4244-9795-9
DOI :
10.1109/CCCA.2011.6031451