[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f84D36CQPY0Qxm9CHNL5M4OCOt1OplXJikPX33cfHFJ8":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",162765136,[8,9,10,11],"SF","2SF","SF\u002F2","2的SF幂次方",{"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","假设扩频因子为SF,信号经扩频之后,一个码元包含()个码片",[21,31,36,39,48,57,66,74,80,86],{"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":6,"options":38,"question":19,"source":29,"type":30},[],[8,9,10,11],{"answer":40,"createTime":5,"id":41,"options":42,"question":47,"source":29,"type":30},[],162765137,[43,44,45,46],"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":49,"createTime":5,"id":50,"options":51,"question":56,"source":29,"type":30},[],162765138,[52,53,54,55],"1","5","6","7","1bit信号经7倍扩频之后的数据比特数为",{"answer":58,"createTime":5,"id":59,"options":60,"question":65,"source":29,"type":30},[],162765139,[61,62,63,64],"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":67,"createTime":5,"id":68,"options":69,"question":73,"source":29,"type":30},[],162765140,[55,70,71,72],"","7\u002F5.5","125\u002F5.5","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",{"answer":75,"createTime":76,"id":77,"options":78,"question":73,"source":29,"type":30},[],"2024-11-07 20:16:08",164930994,[55,79,71,72],"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"]