A subcarriers allocation scheme for cognitive radio systems based on multi-carrier modulation

被引：22
|
作者：
Luo, Tao [2 ]
Jiang, Tao [3 ]
Xiang, Weidong [4 ]
Chen, Hsiao-Hwa [1 ]
机构：
[1] Natl Cheng Kung Univ, Dept Engn Sci, Tainan 701, Taiwan
[2] Beijing Univ Posts & Telecommun, Sch Telecommun Engn, Beijing, Peoples R China
[3] Huazhong Univ Sci & Technol, Elect & Informat Engn Dept, Wuhan 430074, Peoples R China
[4] Univ Michigan, Dept Elect & Comp Engn, Dearborn, MI 48128 USA
来源：
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2008年 / 7卷 / 09期
关键词：
cognitive radio; resource management; quality of service; multi-carrier modulation;
D O I：
10.1109/TWC.2008.070372
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Cognitive radio (CR) is a dynamic spectrum access technology as a solution to spectrum under-utilization problem in some licensed bands. Operating over an exceedingly wide spectrum, CR systems usually adopt multi-carrier modulation (MCM) to implement flexible channelization. Consequently, efficient channel allocation scheme becomes extremely important to an MCM based CR (MCM-CR) system. In this paper, a maximum likelihood detection model is developed to detect the presence and locations of licensed users (LUs) signals in the frequency domain. Performance of the detection model, including the optimal detection region, detection probability and false alarm probability, is analyzed. A one-order two-state Markovian chain model is proposed to predict channel status information. In particular, a novel subcarrier allocation scheme for MCM-CR systems is proposed, taking into account the confidence of channel estimation, quality of services (QoS) of rental users (RUs) and throughput. To validate the analytical results, simulations have been conducted to show effectiveness of the proposed scheme.
引用
收藏
页码：3335 / 3340
页数：6
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