Performance of an Uplink OFDMA System Using Subcarrier Allocation


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Shalini, J. and Manjunatha, Y.R. (2015) Performance of an Uplink OFDMA System Using Subcarrier Allocation. International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, 4 (12). ISSN 2278 – 8875


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OFDMA (Orthogonal Frequency Division Multiple Access) suffers from destruction of orthogonility if a channel betweenthe mobile user and a base station is rapidly time varying. This channel between the mobile user and a base station is called an Uplink-OFDMA. The OFDMA uplink resource allocation undergoes from Inter carrier interference (ICI), multiuser interference (MUI) if a nearby subcarrier is assigned to different user, high peak to average power ratio (PAPR) and high bit error rate (BER).This results in performance degradation. In order to provide a significant improvement in performance, a practical OFDMA system detection is required. The proposed system consists of a new sub-carrier allocation method using a successive interfer ence cancelation (SIC) detector at the receiver side. The proposed system is designed and simulated using MATLAB tool. Simulation results show that the proposed subcarrier allocation and ―Interleaved Aǁ allocation method has an average Bit errorprobability of 10 -0.5 and 10-0.2 respectively. Thus Average Bit error probability of around 32% is reduced compared to the ―Interleaved Aǁallocation method. Further, simulations also demonstrate a gradual decrease in MUI power from -15db to -20db for interleaved al location and subcarrier allocation method respectively.

Item Type: Article
Subjects: Faculty of Engineering > Electrical Engineering
Divisions: University Visvesvarayya College of Engineering > Department of Electrical Engineering
Depositing User: Mrs Rajani S
Date Deposited: 22 Jul 2016 10:03
Last Modified: 22 Jul 2016 10:03

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