By Topic

Power control and performance analysis of cognitive radio systems under dynamic spectrum activity and imperfect knowledge of system state

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Liangzhong Ruan ; Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China ; Lau, V.K.N.

Power control plays a critical role in cognitive radio (CR) system to achieve a balance between efficient sharing of licensed spectrum and interferences to primary system (PU). Most of the existing works considered power control under perfect knowledge of system state (such as channel state information (CSIT) and sensing information (SIT)). In this paper, we shall focus on the design and analysis of power control scheme under imperfect knowledge of system state for SISO and OFDM systems. We obtained asymptotically optimal power control policy, taking into account of imperfect system state knowledge and packet errors due to channel outage. In addition, we found that system parameters affect asymptotic average goodput by O(-ln(rhopRp)e-sigma e 2 /1-sigma e 2) and O(e-rho p R pe-sigma e 2 /1-sigma e 2) under low and high PU activities respectively where rhopRp, sigmae 2 represents PU activity level and CSIT quality respectively.

Published in:

Wireless Communications, IEEE Transactions on  (Volume:8 ,  Issue: 9 )