A novel heuristic method for resource allocation in downlink OFDMA systems: Context IEEE 802.16 m

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.