CAJ | 학술논문

提出了一种新的协作频谱感知方法，该方法采用DS证据理论。首先，在本地感知通过投影近似法分解感知结果以减少次级用户上报至融合中心的感知数据，从而降低协作带宽开销。其次，在融合中心根据次级用户证据矢量之间的距离计算可信度，以可信度为权重对每个次级用户的基本概率分配进行加权平均来减小高度冲突数据对检测性能的影响。仿真结果表明，该方法减少了协作感知的带宽开销，改善了数据高度冲突时的检测性能。
제출료일충신적협작빈보감지방법，해방법채용DS증거이론。수선，재본지감지통과투영근사법분해감지결과이감소차급용호상보지융합중심적감지수거，종이강저협작대관개소。기차，재융합중심근거차급용호증거시량지간적거리계산가신도，이가신도위권중대매개차급용호적기본개솔분배진행가권평균래감소고도충돌수거대검측성능적영향。방진결과표명，해방법감소료협작감지적대관개소，개선료수거고도충돌시적검측성능。
An improved cooperative spectrum sensing scheme based on dempster-shafer evidence theory in cognitive ra-dio networks was proposed. In the local sensing period, the projection approximation algorithm was introduced to reduce bandwidth for cooperation. In the fusion period, credibility was calculated by the distance between evidence vectors of different secondary users and adopted as the weights to combine different local sensing data. The new scheme reduces channel bandwidth and simulation results show that the new scheme improves the performance under the condition of high level conflict.