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A multi-level soft frequency reuse (ML-SFR) scheme and a resource allocationmethodology are proposed for wireless communication systems in this letter. Inthe proposed ML-SFR scheme, there are 2N power density limit levels, achievingbetter interference pattern and further improving the cell edge and overalldata rate, compared to the traditional 2-level SFR scheme. The detailed designof an 8-level SFR scheme is demonstrated. Numeral results show that the celledge spectrum efficiency is increased to 5 times of that of reuse 1 and theoverall spectrum efficiency is improved by 31%. ML-SFR can be utilized in thecurrent 4G system and would be a candidate key technology for future 5Gsystems.

A multi-level soft frequency reuse technique for wireless communication systems