[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$ffjeXAocsjghYJW5Fis6uz3w7R17R4SWJuXianNyRCic":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":29,"type":30},[],"2024-10-23 09:38:43",162765140,[8,9,10,11],"7","","7\u002F5.5","125\u002F5.5",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},17,"83fa2ee0a09a4b555a191abdb69c017e","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F48eba3395437dd881b1b9275a0ad1028.png","物联网通信技术","work_38115525","LoRa技术核心-Chirp调制解调技术","一个LoRa系统在传输一组数据,其占用带宽为125kHz,采用SF7扩频传输的数据流速率约为5.5kb\u002Fs,则这个LoRa系统的处理增益为",[21,31,36,45,54,62,71,74,80,86],{"answer":22,"createTime":5,"id":23,"options":24,"question":28,"source":29,"type":30},[],162765134,[25,26,27],"不变","变小","变大","信号经扩频调制之后,信号的功率谱密度","v1",0,{"answer":32,"createTime":5,"id":33,"options":34,"question":35,"source":29,"type":30},[],162765135,[25,27,26],"信号经扩频调制之后,信号总能量",{"answer":37,"createTime":5,"id":38,"options":39,"question":44,"source":29,"type":30},[],162765136,[40,41,42,43],"SF","2SF","SF\u002F2","2的SF幂次方","假设扩频因子为SF,信号经扩频之后,一个码元包含()个码片",{"answer":46,"createTime":5,"id":47,"options":48,"question":53,"source":29,"type":30},[],162765137,[49,50,51,52],"逻辑与","逻辑或","逻辑同或","逻辑异或","直接序列扩频系统中,数据信号与伪随机序列进行()操作",{"answer":55,"createTime":5,"id":56,"options":57,"question":61,"source":29,"type":30},[],162765138,[58,59,60,8],"1","5","6","1bit信号经7倍扩频之后的数据比特数为",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":29,"type":30},[],162765139,[66,67,68,69],"10 b\u002Fs\u002FHz","1024 b\u002Fs\u002FHz","10\u002F1024 b\u002Fs\u002FHz","1\u002F1024 b\u002Fs\u002FHz","LoRa系统采用扩频因子SF=10时的频谱效率是()",{"answer":72,"createTime":5,"id":6,"options":73,"question":19,"source":29,"type":30},[],[8,9,10,11],{"answer":75,"createTime":76,"id":77,"options":78,"question":19,"source":29,"type":30},[],"2024-11-07 20:16:08",164930994,[8,79,10,11],"125\u002F(5.5*7)",{"answer":81,"createTime":76,"id":82,"options":83,"question":84,"source":29,"type":85},[],164930995,[],"扩频调制特点",2,{"answer":87,"createTime":76,"id":88,"options":89,"question":90,"source":29,"type":85},[],164930996,[],"扩频系统分类"]