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为减少由峰值模糊造成的载波频偏误判概率,提出一种改进算法,通过计算Q路信号的相关值提高了对载波频率偏移的分辨能力,并利用相关值的重叠相加改进了目标码段的相关峰值.仿真结果表明,改进算法在不损失捕获速度和不增加资源消耗的前提下,有效地提高了检测概率、降低了载波频偏误判概率,是一种快速高效的GPS信号P码直接捕获算法. 相似文献
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To improve the detection performance of sensing users for primary users in the cognitive radio, an optimal cooperative detection algorithm for many sensing users is proposed. In this paper, optimal decision thresholds of each sensing user are discussed. Theoretical analysis and simulation results indicate that the detection probability of optimal decision threshold rules is better than that of determined threshold rules when the false alarm of the fusion center is constant. The proposed optimal cooperative detection algorithm improves the detection performance of primary users as the attendees grow. The 2 dB gain of detection probability can be obtained when a new sensing user joins in, and there is a 17 dB improvement when the accumulation number increases from 1 to 50. 相似文献
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以双极化被动雷达为应用背景,开展了圆锥正弦天线的结构设计与实验方面的研究。圆锥正弦天线是将平面型四臂正弦天线设计成与圆锥表面共形的形式,采用微带粘结法加工而成。引入两个微带指数渐变平衡-不平衡转换器(巴伦)实现对四臂圆锥正弦天线的平衡馈电。针对频率2~5 GHz的范围,设计了具体的天线结构和微带巴伦,对实际加工的天线进行了实际测量工作。在工作频率范围内,测得的两个极化端口的输入平均电压驻波比(VSWR)约为2,增益均大于4 dBi,极化端口隔离度约低于-20 dB,辐射方向图具有较好的极化纯度。本文的研究成果对实际工程具有重要的参考价值。 相似文献
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This paper investigates the downlink capacity distribution and the outage probability of the interested area of maximum ratio transmission-selection combining (MRT-SC) scheme in the distributed antenna... 相似文献
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为了改善认知无线电中感知用户(未授权)对主用户弱信号的检测性能,采用多个感知用户合作的联合最优门限判决算法.在考虑参与联合检测的各感知用户判决门限具有相关性的条件下,通过理论分析和软件仿真,表明联合检测算法随着参与检测用户数目的增加,能够改善对主用户弱信号的检测性能.在融合中心虚警概率恒定的条件下,与给定各判决门限和系统融合准则的算法相比较,联合最优门限判决算法性能更好.但因各感知用户判决门限具有相关性,系统检测性能比各感知用户判决独立条件下有一定损失. 相似文献
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