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Weighted one bit hard combination for cooperative spectrum sensing is proposed in this paper. Two thresholds are adopted to divide the possible energy value into three weighted regions.If the energy value falls into the corresponding region, it will be judged as “1”, no information or “0”. When the probability of false alarm is constrained to be constant, the objective is to maximize the probability of detection. The optimization problem is simplified by separating the weight of the middle region into several intervals. Simulation results show that the sensing performance of the proposed scheme is much better than that of the traditional one bit hard combination scheme and almost the same as that of the equal gain combination (EGC) scheme. Moreover, compared with the traditional one bit hard combination, fewer average sensing bits are required to transmit to the data fusion center with the proposed method. 相似文献
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研究了TD-LTE/LTE FDD/WCDMA/GSM融合组网下的互操作策略,通过优选TD-LTE并开启LTE FDD和TD-LTE之间的负载均衡来充分利用LTE网络资源。在LTE/WCDMA/GSM同覆盖区域,LTE仅配置与WCDMA的互操作以提供最优的用户体验,并提出了开启WCDMA基于状态转换重定向至LTE功能以加速用户回到LTE。同时在无WCDMA覆盖区域,采用LTE FDD和GSM的多模基站进行部署来节约网络建设投资,并给出了该部署场景下CSFB至GSM的优化方案和性能。 相似文献
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未来移动通信网络在满足用户个性化需求的同时将社会福祉作为网络发展的重要方向,基于对移动通信网络业务发展趋势和挑战的分析探讨,面向下一代移动通信网络泛在接入、绿色节能等发展需求,指出智能超表面(Reconfigurable Intelligent Surface, RIS)在5G-Advanced(5G-A)和6G网络典型应用场景,并从技术能力、产业成熟度等多个角度分析RIS在信道侧和收发端等不同场景下的应用价值。面向移动通信网络设备管控需求,提出了基于网络控制、自主调控和终端控制三种RIS管控方案,并分析了三种方案的差异。 相似文献
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为了实现得到低压大电流的功率输出,设计并验证了一种带同步整流的双管DC/DC变换器。着重介绍了双管正激变换器的工作原理,对其中主要的电子元件进行参数设计,利用SG3525控制芯片制作了一台30W实验样机,结果表明变换器的动态性能良好,具有较高的效率与一定的实用价值。 相似文献
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研究了我国地面数字多媒体广播(DMB-T)系统的频谱感知算法。理论上分析了在该系统3种模式下能量检测算法的虚警和漏检概率。对于帧头模式2提出了采用匹配滤波器方法进行频谱感知,对于帧头模式1和模式3提出了新的扩展PN序列作为本地相关序列来进行频谱感知。 相似文献
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We report the observation for the pz electron band and the band inversion in Fe1+yTexSe1-x with angleresolved photoemission spectroscopy. Furthermore, we found that excess Fe(y>0) inhibits the topological band inversion in Fe1+yTexSe1-x,which explains the absence of Majorana zero modes in previous reports for Fe1+yTexSe1-x with excess Fe. Based on our analysis of different amounts of Te doping a... 相似文献
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