INTERNATIONAL JOURNAL OF RESEARCH IN COMPUTER APPLICATIONS AND ROBOTICS www.ijrcar.com Vol.4 Issue 4, Pg.: 34-43 April 2016 B.K.AnuPreethi, K. Sathya, M.Laavanya, V. Vijayaraghavan Page 34 INTERNATIONAL JOURNAL OF RESEARCH IN COMPUTER APPLICATIONS AND ROBOTICS ISSN 2320-7345 IMPROVED RESOURCE ALLOCATION FOR CO-OPERATIVE OFDMA WIRELESS NETWORKS B.K.AnuPreethi 1 , K. Sathya 2 , M.Laavanya 3 , V. Vijayaraghavan 4 1,2 PG Student [CS], Dept. of ECE, Info Institute of Engineering, Coimbatore, TamilNadu, India 3,4 Assiatant professor, Dept. of ECE, Info Institute of Engineering, Coimbatore, TamilNadu, India E-Mail: anupreethikumar28@gmail.com Abstract: - Wireless networks use two or more wireless hops to convey information from source to destination. Orthogonal Frequency Division Multiple Access (OFDMA) is an multi-user version and multiple accesses that can be ensured by allocating the subsets of subcarrier. The resource allocation is a very prominent concept in the network applications by providing shortest path, energy allocation, lower computation overhead and higher response time. In the existing scenario, resource reuse methods are used in the OFDMA networks .The dynamic intra-cell subcarrier reuse in cooperative OFDMA networks, the users are permitted to distribute any subcarrier in the relay links provided that the resultant intra-cell interference is managed. Particularly, while the target data rates of the users are not reachable in the traditional cooperative OFDMA network, dynamic intra-cell subcarrier reuse permits the users to ensure their objective data rates. The subcarriers are permitted to reuse in the communicate associations in order to maximize the system sum-rate subject to per node power and desired data rate conditions in a cooperative OFDMA single cell network. However, OFDMA with suboptimal resource allocation has issues with high complexity algorithms and also with the distributed implementation of the resource allocation techniques. Improved resource allocation technique is used to overcome this issue by using the concept of minimization of resource allocation with neighbour nodes while in the distribution environment. This technique is used to improve the relay link along with maximum gain for high data rate users and also improves the power reduction as well as developing the resource allocation more effectively than existing scenario. Keywords: Resource Allocation, OFDMA, OCA, MC-CDMA, ISRAA of AF. 1.1 INTRODUCTION Wireless communication is used for transferring the information between two or more nodes. Usage of mobile phone is increasing in day todays life. Mobile phones needs small amount of power and compact antenna. Base station pick up the weak signal from the phone and relay it onwards another phone mast which is nearer to destination. There is only limited number of radio frequencies available on the mobile network. Mobile phone conversation requires one frequency for transmission and another frequency for reception. Cells which divides the land in which same frequencies can be reused by each other. Cell site has the base station with about 800- 1900MHZ for both transmitting and receiving antenna. The radio equipment provides the coverage from an area that is usually two to ten miles in radius. Depending upon the cell sit the area is covered. OFDMA and relay enhanced wireless networks are used to provide the ubiquitous coverage and high data rate in the future wireless networks. In OFDMA all users communicate with the base station directly without the relay links. Relay