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Optimizing WiMAX: Mitigating Co-Channel Interference for Maximum Spectral Efficiency

Author(s)
ABDUL QADIR ANSARI Department of Biomedical Engineering, Mehran University of Engineering & Technology, Jamshoro, Pakistan
ABDUL LATEEF MEMON Department of Telecommunication Engineering, Mehran University of Engineering & Technology, Jamshoro, Pakistan
IMRAN ALI QURESHI Department of Telecommunication Engineering, Mehran University of Engineering & Technology,Jamshoro, Pakistan
Abstract
The efficient use of radio spectrum is one of the most important issues in wireless networks because spectrum is generally limited and wireless environment is constrained to channel interference. To cope up and for increased usefulness of radio spectrum wireless networks use frequency reuse technique. The frequency reuse technique allows the use of same frequency band in different cells of same network considering inter-cell distance and resulting interference level. WiMAX (Worldwide Interoperability for MicrowaveAccess) PHY profile is designed to use FRF (Frequency Reuse Factor) of one. When FRF of one is used it results in an improved spectral efficacy but also results in CCI (Co-Channel interference) at cell boundaries. The effect of interference is always required to be measured so that some averaging/ minimization techniques may be incorporated to keep the interference level up to some acceptable threshold in wireless environment. In this paper, we have analyzed, that how effectively CCI impact can be mitigated by using different subcarrier permutation types presented in IEEE 802.16 standard. A simulation based analysis is presented wherein impact of using same and different permutation base in adjacent cells in a WiMAX network on CCI, under varying load conditions is analyzed. We have further studied the effect of permutation base in environment where frequency reuse technique is used in conjunction with cell sectoring for better utilization of radio spectrum.
Publication Details
Page(s) 645-656
DOI DOI not available
Published Journal: Mehran University Research Journal of Engineering and Technology, Volume: 35, Issue: 4, Year: 2016

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Keywords
Orthogonal Frequency Multiple Access, Cell Sectoring, FRF-Frequency Reuse Factor, Worldwide Interoperability for MicrowaveAccess
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