CAJ | 학술논문

在Femtocell和Macrocell构成的两层异构网络中，前人提出运用认知无线电的技术来解决网络中存在的干扰问题，但大多数研究主要集中在频谱资源的管理上，没有提出高效的频谱检测方法。本文结合认知无线电中频谱感知技术提出了基于双门限的两层协作频谱感知，检测出空洞的频谱资源分配给Femtocell用户使用，既能提高频谱资源的利用率，又能有效的抑制Femtocell与Macrocell之间的干扰。文中推导出了Femtocell用户基于双门限的两层频谱感知的检测概率和虚警概率，给出了Femtocell网络中感知信息两比特编码的融合准则和基于双门限的两层协作频谱感知的具体实施方法。仿真结果表明，所提算法能够有效提高Femtocell用户的频谱检测概率，通过对感知信息进行两比特编码，再将编码后的信息发送至融合中心进行融合，能够有效的提高整个系统的检测性能，抗噪声能力强。
재Femtocell화Macrocell구성적량층이구망락중，전인제출운용인지무선전적기술래해결망락중존재적간우문제，단대다수연구주요집중재빈보자원적관리상，몰유제출고효적빈보검측방법。본문결합인지무선전중빈보감지기술제출료기우쌍문한적량층협작빈보감지，검측출공동적빈보자원분배급Femtocell용호사용，기능제고빈보자원적이용솔，우능유효적억제Femtocell여Macrocell지간적간우。문중추도출료Femtocell용호기우쌍문한적량층빈보감지적검측개솔화허경개솔，급출료Femtocell망락중감지신식량비특편마적융합준칙화기우쌍문한적량층협작빈보감지적구체실시방법。방진결과표명，소제산법능구유효제고Femtocell용호적빈보검측개솔，통과대감지신식진행량비특편마，재장편마후적신식발송지융합중심진행융합，능구유효적제고정개계통적검측성능，항조성능력강。
In the two-tier network constituted by femtocell and macrocell,predecessors put forward using the cognitive radio technology to solve the problem of interference existing in the network.However,most studies just focus on the man-agement of spectrum resources,and have not provided efficient spectrum detection methods.A two-tier cooperative spec-trum sensing is prosposed based on double thresholds combined with the spectrum sensing technology in cognitive radio.By allocating the empty spectrum resources to the femtocell users,the proposed algorithm improves the utilization of spectrum resources,and suppresses the interference between femtocell and macrocell effectively.For the femtocell users,this paper derives the detection probability and false alarm probability of two-tier spectrum sensing based on double thresholds.A two-bit-coding fusion rule of sensing information is proposed for the femtocell network.At the same time,the specific imple-mentation steps are given for the two-tier cooperative spectrum sensing based on double thresholds.Simulation results show that the proposed algorithm can effectively improve the detection probability of single femtocell user.It also shows that the two-bit-coding of the sensing information and the encoded information fusion in the center can effectively improve the detec-tion performance and anti acoustic performance of the system.