Resource Allocation in OFDMA Wireless Communications Systems Supporting Multimedia Services  



We design a resource allocation algorithm for downlink of orthogonal frequency division multiple access (OFDMA) systems supporting real-time (RT) and best-effort (BE) services simultaneously over a time-varying wireless channel.. We formulate the optimization problem representing the resource allocation under consideration and solve it by using the dual optimization technique and the projection stochastic sub gradient method. Simulation results show that the proposed algorithm well meets the QoS requirements with the high throughput and outperforms the modified largest weighted delay first (M-LWDF) algorithm that supports similar QoS requirements.

Proposed System

The proposed algorithm aims at maximizing system throughput while satisfying quality of service (QoS) requirements of the RT and BE services. We take two kinds of QoS requirements into account.

One is the required average transmission rate for both RT and BE services. The other is the tolerable average absolute deviation of transmission rate (AADTR) just for the RT services, which is used to control the fluctuation in transmission rates and to limit the RT packet delay to a moderate level


•  Networking Module.

•  Real time & Best Effort module.

•  Resource allocation Module.

•  Graphical Module.

Multimedia Service Module


  • System : Pentium IV 2.4 GHz.
  • Hard Disk : 40 GB.
  • Floppy Drive : 1.44 Mb.
  • Monitor : 15 VGA Colour.
  • Mouse : Logitech.
  • Ram : 256 Mb


  • Operating system : - Windows XP Professional.
  • Front End : - ASP.Net 2.0.
  • Coding Language :- Visual C# .Net





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