CAJ | 학술논문

在认知无线网络中，协作频谱感知技术可有效提高衰落信道下的检测性能，提高对主用户的保护程度以及认知用户的接入机会。在信道状态良好的情况下，参与协作的认知用户数越多，感知性能越好。而在实际的频谱感知过程中，如果感知信道条件较差的话，认知用户的本地感知结果并不准确，此时该认知用户的本地感知结果对于总的协作感知并不能起到积极的作用；其次，参与协作的认知用户数越多，发送本地决策值占用的系统带宽也越大。为了节约系统资源避免不必要的信令传输，本文提出一种自适应的协作频谱感知方法，只有当认知用户的感知信道条件较好时才将其本地感知结果发送到融合中心，否则不发送，以节约系统资源。最后，通过仿真验证了所提方法的有效性。结果表明，所提方法可有效节约系统开销。
재인지무선망락중，협작빈보감지기술가유효제고쇠락신도하적검측성능，제고대주용호적보호정도이급인지용호적접입궤회。재신도상태량호적정황하，삼여협작적인지용호수월다，감지성능월호。이재실제적빈보감지과정중，여과감지신도조건교차적화，인지용호적본지감지결과병불준학，차시해인지용호적본지감지결과대우총적협작감지병불능기도적겁적작용；기차，삼여협작적인지용호수월다，발송본지결책치점용적계통대관야월대。위료절약계통자원피면불필요적신령전수，본문제출일충자괄응적협작빈보감지방법，지유당인지용호적감지신도조건교호시재장기본지감지결과발송도융합중심，부칙불발송，이절약계통자원。최후，통과방진험증료소제방법적유효성。결과표명，소제방법가유효절약계통개소。
In cognitive wireless networks,cooperative spectrum sensing can effectively improve the detection per-formance under fading channels and enhance the protection ability to primary users and the access chance of cogni-tive users. More cognitive users will make the better sensing performance when the channel conditions are better. While in actual spectrum sensing ,the local sensing results of cognitive users maybe not accurate if the sensing channels are destructive,which will play no part in total cooperative spectrum sensing. Secondly,more cognitive us-ers that take part in cooperation will lead to the more system bandwidth occupied for sensing local decision results. In order to save system resource and avoid the unnecessary signal transmission,we propose an adaptive cooperative spectrum sensing scheme,in which,only when the sensing channel conditions are better,the cognitive users will send local sensing results to the fusion center so as to save system resources. The simulation results validated the proposed scheme. The results indicate that the system expense can be effectively saved by the proposed scheme.