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车内宽带信道测量与建模 被引量:5
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作者 张念祖 刘蕾蕾 +5 位作者 洪伟 张彦 蒯振起 董元旦 陈继新 王海明 《电波科学学报》 EI CSCD 北大核心 2009年第5期793-798,984,共7页
介绍了针对车内环境进行的宽带信道特性测量结果和提取的信道特性。测量的信道频率范围为0.5~16GHz,场景包括了直达径(Line—of-Sight,LOS)和非直达(Non—Line—of-Sight,NLOS)的典型情况,同时也考虑了收发距离和车内乘员的... 介绍了针对车内环境进行的宽带信道特性测量结果和提取的信道特性。测量的信道频率范围为0.5~16GHz,场景包括了直达径(Line—of-Sight,LOS)和非直达(Non—Line—of-Sight,NLOS)的典型情况,同时也考虑了收发距离和车内乘员的影响。测量结果显示:车内环境下的小尺度多径衰落模型可以使用Saleh-Valenzuela(S—V)模型进行描述。车内的幅度衰落统计特性服从Lognormal分布。从测量的数据中提取了均方根时延扩展和S-V模型的关键参数。进一步的研究显示:均方根时延较少依赖于传输距离,主要取决于车内的环境、人员数量和布局。统计得出的信道参数和分布特性可以建立离散时间信道模型,应用于仿真与验证宽带通信系统。 展开更多
关键词 车内.环境 信道测量 统计模型 宽带
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Reservation Based Optimal Parking Lot Recommendation Model in Internet of Vehicle Environment 被引量:5
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作者 FUJiabin CHEN Zhenxiang +1 位作者 SUN Runyuan YANG Bo 《China Communications》 SCIE CSCD 2014年第10期38-48,共11页
In order to solve the problem that the drivers can't find the optimal parking lot timely,a reservation based optimal parking lot recommendation model in Internet of Vehicle(IoV) environment is designed.Based on th... In order to solve the problem that the drivers can't find the optimal parking lot timely,a reservation based optimal parking lot recommendation model in Internet of Vehicle(IoV) environment is designed.Based on the users oriented parking information recommendation system,the model considers subjective demands of drivers comprehensively,makes a deeply analysis of the evaluation indicators.This recommendation model uses a phased selection method to calculate the optimal objective parking lot.The first stage is screening which based on the users' subjective parking demands;the second stage is processing the candidate parking lots through multiple attribute decision making.Simulation experiments show that this model can effectively solve the problems encountered in the process of finding optimal parking lot,save the driver's parking time and parking costs and also improve the overall utilization of parking facilities to ease the traffic congestion caused by vehicles parked patrol. 展开更多
关键词 intelligent parking guidance parking lot recommendation phased selectionmethod evaluation indicators
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