CAJ | 학술논문

针对当前协作频谱感知检测性能和协作开销的矛盾，提出了一种基于双门限能量检测的多天线认知用户分级融合协作频谱感知机制。通过引入多天线平方律合并技术，利用空间分集增益提高了认知节点的本地感知性能，并设置门限将本地感知结果划分为1 bit、2 bit两种，通过融合中心限制参与融合认知节点的最小个数，认知用户分级上传感知结果，融合中心根据上传结果分级融合感知信息。仿真结果表明，该机制较好地实现了感知性能和通信开销的折衷，同时对双门限区间的取值有较好的鲁棒性；当大部分感知数据落入双门限之间时，明显降低了有故障节点时感知失败的概率。
침대당전협작빈보감지검측성능화협작개소적모순，제출료일충기우쌍문한능량검측적다천선인지용호분급융합협작빈보감지궤제。통과인입다천선평방률합병기술，이용공간분집증익제고료인지절점적본지감지성능，병설치문한장본지감지결과화분위1 bit、2 bit량충，통과융합중심한제삼여융합인지절점적최소개수，인지용호분급상전감지결과，융합중심근거상전결과분급융합감지신식。방진결과표명，해궤제교호지실현료감지성능화통신개소적절충，동시대쌍문한구간적취치유교호적로봉성；당대부분감지수거락입쌍문한지간시，명현강저료유고장절점시감지실패적개솔。
To solve the current contradiction between sensing performance and cooperation overhead of cooperative spec-trum sensing, a hierarchical fusion cooperative spectrum sensing scheme based on double thresholds with multi-antenna Cognitive Radios(CRs)is proposed in this paper. Additional improvement of local sensing performance of CRs is provided by taking advantage of space diversity gain for employing Square Law Combining(SLC)with multiple antennas. The local sensing results are divided into one-bit and two-bit decisions by setting thresholds. And then by limiting the lowest num-ber of cooperating CRs through Fusion Center(FC), CRs make a hierarchical report and Fusion Center(FC)makes a hierarchical fusion based on the sensing report. Simulation results show that the proposed scheme achieves a good tradeoff between sensing performance and communication overhead and is more robust to the distance between double thresholds. Also, when most of the detected values fall between the two thresholds, the probability of sensing failure problem caused by malfunctioning CR is greatly reduced.