In view of problem that traditional double-threshold spectrum sensing algorithm cannot make full use of information of sensing users between two thresholds,the paper proposed a double-threshold spectrum sensing algorithm based on D-S theory.When signal energy received by the sensing users lies between the two thresholds,the algorithm does not give judging result directly but makes local judgment,namely it uses D-S theory to make data fusion.Simulation result shows that detection probability of double-threshold spectrum sensing algorithm based on D-S theory is higher than one of the traditional double-threshold spectrum sensing algorithm,which improves performance of spectrum sensing.

<正>一、交通需求分析1.需求规模分析。交通需求是一项派生性的需求,对于交通需求规模的分析首先判断区域社会经济的发展阶段和未来的发展趋势,然后进行交通专业的预测分析。(1)徐州还处于工业化中期。2006年徐州市实现地区生产总值1207亿元,一、二、三产