scholarly journals Subcarrier and power adaptation for multiuser OFDM-based cognitive radio systems

2010 ◽  
Author(s):  
Gaurav Bansal ◽  
Ziaul Hasan ◽  
Jahangir Hossain ◽  
Vijay K. Bhargava
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Systems ◽  
Power Adaptation ◽  
Radio Systems ◽  
Multiuser Ofdm

scholarly journals Performance of Equal Power Allocation in Multiuser OFDM-Based Cognitive Radio Systems

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Yonghong Zhang ◽  
Cyril Leung
Keyword(s):  
Cognitive Radio ◽  
Power Allocation ◽  
Activity Levels ◽  
Cognitive Radio Systems ◽  
Water Filling ◽  
Radio Systems ◽  
Cr System ◽  
Equal Power Allocation ◽  
Equal Power ◽  
Multiuser Ofdm

The performance difference between a simple equal subchannel power allocation and the optimal water-filling subchannel power allocation schemes is studied for a multiuser OFDM-based cognitive radio (CR) system. It is shown that this difference depends on the average subchannel gain variations among the CR users as well as the activity levels of the primary users.

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