This paper deals with radio resource allocation in fourth generation (4G) wireless mobile networks based on Orthogonal\r\nFrequency Division Multiple Access (OFDMA) as an access method. In IEEE 802.16m standard, a contiguous method for\r\nsubchannel construction is adopted in order to reduce OFDMA system complexity. In this context, we propose a new subchannel\r\ngain computation method depending on frequency responses dispersion. This method has a crucial role in the resource\r\nmanagement and optimization. In a single service access, we propose a dynamic resource allocation algorithm at the physical layer\r\naiming to maximize the cell data rate while ensuring fairness among users. In heterogeneous data traffics, we study scheduling in\r\norder to provide delay guaranties to real-time services, maximize throughput of non-real-time services while ensuring fairness to\r\nusers.We compare performances to recent existing algorithms in OFDMA systems showing that proposed schemes provide lower\r\ncomplexity, higher total system capacity, and fairness among users.
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