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Full-Filling Subcarrier Power Allocation in OFDMA-Based Cognitive Radio Systems
University of Engineering and Technology, Hanoi, Viet Nam
Authority of Radio Frequency Management, Hanoi, Viet Nam
University of Engineering and Technology, Hanoi, Viet Nam
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore City, Singapore
- 1 University of Engineering and Technology, Hanoi, Viet Nam
- 2 Authority of Radio Frequency Management, Hanoi, Viet Nam
- 3 University of Engineering and Technology, Hanoi, Viet Nam
- 4 School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore City, Singapore
Wireless Engineering and Technology·Volume 05 (2014)·Pages 11–18·Published 9 January 2014·DOI10.4236/wet.2014.51002
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Abstract
When implementing an appropriate windowing, the interference from a Cognitive Radio (CR) system to licensed systems (primary users) will be significantly reduced. Consequently , power allocated to subcarriers can be increased, especially subcarriers having far spectral distance to primary user bands can be allocated full of its maximum possible power. In this paper, we propose a new class of sub-optimal subcarrier power allocation algorithm that significantly reduces complexity of OFDMA-based CR systems. Two sub-optimal proposals, called Pre-set Filling Range (PFR) and Maximum Filling Range (MFR) are studied. Investigations show that this new power allocating algorithm allows CR systems obtain high throughput while retain ing low complexity.
KeywordsCognitive RadioWindowingPower AllocationFull Filling
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