CAJ | 학술논문

在无线传播过程中,主用户信号经常会受到路径损耗、阴影衰落等影响,导致无线通信环境中单个认知用户对主用户的感知结果存在不确定性。因此,结合D-S证据理论方法,提出了一种新的协作频谱感知算法。以能量检测作为基础,将证据间冲突变化程度平均性的概念结合其中,根据这一方式设计了一种新的证据理论合成法则,将多个D-S融合结果送到融合中心进行数据融合,得出最终判决。仿真实验结果表明,该算法能够很好地解决证据间的高度冲突并较为合理地减轻不确定性因素的影响,在信噪比比较低的情况下,获得较好的检测性能。
재무선전파과정중,주용호신호경상회수도로경손모、음영쇠락등영향,도치무선통신배경중단개인지용호대주용호적감지결과존재불학정성。인차,결합D-S증거이론방법,제출료일충신적협작빈보감지산법。이능량검측작위기출,장증거간충돌변화정도평균성적개념결합기중,근거저일방식설계료일충신적증거이론합성법칙,장다개D-S융합결과송도융합중심진행수거융합,득출최종판결。방진실험결과표명,해산법능구흔호지해결증거간적고도충돌병교위합리지감경불학정성인소적영향,재신조비비교저적정황하,획득교호적검측성능。
In the wireless communication channel,the impacts of fading channel and shadow are unavoidable in the process of capturing primary signals.It leads to a kind of uncertainty about the spectrum sensing results for a single cognitive user.Therefore,on the basis of existing D-S evidence theory algorithm,this paper proposes a new spectrum sensing algorithm.The fusion center fuses the different fusion results in the domain,and gets the final decision.It is based on the energy detection algorithm and proposes the concept of average of conflict's volatility between evidences.We design a novel combination rule of Dempster-Shafer theory based on it.The simulation results show that this algorithm can solve the problem of the high degree conflict between evidences and reduce the affection of uncertainty factors more effectively,the performance of new algorithm is better under the low SNR.