Adaptive Neighbor Coordinated Power Control Scheme for Cognitive Radio Ad-Hoc Networks

Nan HAO  Sang-Jo YOO  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.6   pp.1597-1600
Publication Date: 2010/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1597
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
cognitive radio,  power control,  primary receiver,  

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Transmission power control (TPC) is an important aspects of underlay transmission in the cognitive radio (CR) networks since it is able to avoid the extra interference from secondary transmission which can let the CR user coexist with the primary systems around. However, due to the different coverage of the primary signal and CR signal, combined with the complexity of the wireless communication, the scanning CR transmitter may not detect the existence of the primary systems. It will cause inaccurate TPC which will severely disrupt the primary service. In this letter, we propose a dynamic neighbor coordinated power control scheme that can avoid the misdetection of the primary signal and provide relatively accurate TPC related distance estimation. Simulation results show that the proposed scheme greatly reduces interference to the primary systems while enhancing overall CR network throughput.