Novel scheme for interference avoidance in cognitive radio based cellular networks

doi:10.1016/S1005-8885(11)60230-6

中国邮电高校学报(英文) ›› 2012, Vol. 19 ›› Issue (1): 69-76.doi: 10.1016/S1005-8885(11)60230-6

Novel scheme for interference avoidance in cognitive radio based cellular networks

汪赛¹,许晓东² CHEN Xin, TAO Xiao-feng, WANG Qiang

1. 北京市北京邮电大学
2. 北京邮电大学

收稿日期:2011-06-21 修回日期:2011-10-13 出版日期:2012-02-28 发布日期:2012-02-21
通讯作者: 汪赛 E-mail:happy2005wang@126.com
基金资助:
This work was supported by the National Natural Science Foundation of China (61001116), International Scientific and Technological Cooperation Program (S2010GR0902), State Emphasis Special Project 2009ZX03003-011-02.

Novel scheme for interference avoidance in cognitive radio based cellular networks

Wireless Technology Innovation Institute, Key Laboratory of Universal Wireless Communication, Ministry of Education Beijing University of Posts and Telecommunications, Beijing 100876, China.

Received:2011-06-21 Revised:2011-10-13 Online:2012-02-28 Published:2012-02-21
Contact: Sai Wang E-mail:happy2005wang@126.com
Supported by:
This work was supported by the National Natural Science Foundation of China (61001116), International Scientific and Technological Cooperation Program (S2010GR0902), State Emphasis Special Project 2009ZX03003-011-02.

摘要/Abstract

摘要：

The cognitive radio (CR) technology is believed to improve the spectrum efficiency. However, the interference problem has become a critical issue due to the coexistence of primary systems and CR systems. In this paper, the interferences in CR based cellular networks are discussed. Interference scenarios are analyzed, considering different interference sources. Meanwhile, an improved model named ‘Cognitive Interference Ring’ is introduced to describe the interference range of each secondary user (SU). Depending on the above analysis, graph coloring based dynamic power allocation (GCDPA) scheme is proposed for interference avoidance. Simulation results demonstrate that in CR based cellular networks, the interferences to primary users (PUs) can be effectively mitigated with the proposed GCDPA scheme, and the system throughput and power efficiency are both improved.

关键词:

CR, interference analysis, interference avoidance, graph coloring, power allocation, cellular networks

Abstract:

Key words:

CR, interference analysis, interference avoidance, graph coloring, power allocation, cellular networks

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Novel scheme for interference avoidance in cognitive radio based cellular networks

Novel scheme for interference avoidance in cognitive radio based cellular networks

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