某系统经长期测定，它的误码率，系统码元速率为1200B，问在多长时间内可能收到360个错误码元？（）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/76ec51166c27449cb6b1247141625712.png
http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/e7a028a2201740e08d700f1b40727ce5.png
举一反三
- 已知某四进制数字信号传输系统的信息速率为2400b/s，接收端在半小时内共收到216个错误码元，则该系统的误码率 Pe 等于（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/2c2151442ead41aca212beea9b5956e0.png"> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/360135bdb3ab42ee81e4df00e7d7bc0c.png"> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/dfcc9daeba714b3b9c0397dcad63f706.png"> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/bd125168bb1d4ba1b7bf04dfdf63abc6.png">
- 某系统经长期测定,其误码率为Pe =10-5,系统码元速率为1200Bd,时间内可能收到360个误码元. 某系统码元速率为1200Bd,1小时可能收到270个误码元。其误码率为
- 设某OOK系统的码元传输速率为1000B，载波信号为，每个码元中包含多少个载波周期，OOK信号的带宽为多大（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/9c6d301c837b4b549033e10bbac0c561.png
- 波长为<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/91ddb92399a343cc990e393ea7ae49e4.png" />的单色光垂直入射于光栅常数为d、缝宽为a、总缝数为N的光栅上。取<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/d02f9b0d40604921bb6eba164d27ae52.png" />，则决定出现主极大的衍射角<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/294d963ff1564c7e9c98a2ca06a7278c.png" />的公式可写成（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/7e2fd47a37564a53afe33f3fadb46a41.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/2c25a6b55e74467992e1b3b1d02662d8.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/f852c846c7b642f6bbcaf2bcfa75c310.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/27465a93e5ca42d8a18f9a3222d0e52b.png" />
- 中国大学MOOC: 某数字通信系统的码元速率为1200波特，接收端在半小时内共接收到216个错误码元，则该系统的误码率为 。
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某通信系统采用八进制数字序列传输方式,其码元速率为9600B,其传信率为____b/s,若传输5s,检测到48个码元误码,其误码率____。
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http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/1bddce95fbb240e1bbbeee3a4a066c5d.png
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http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/e5c3ed68bc434cd28fefaabd46deec74.png
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http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/5f998d872c3d4886b04c1349a5e2cf63.png
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http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/089a9124e2c045908926cf96a6027efe.png