Re: [問題] 通訊
看板comm_and_RF作者SimonHaykin (通訊系統 4/e)時間16年前 (2009/11/13 11:25)推噓10(10推 0噓 1→)留言11則, 10人參與討論串2/2 (看更多)
※ 引述《Proakis (John G. Proakis)》之銘言:
: 假設同步衛星和地球上的基地台之間有10Mbps的微波連結。衛星每分鐘會拍攝一張
: 數位照片並將之傳送給基地台。假設傳播速率為2.4*10^8 meters/sec
: a. 請問該連結傳播延遲為多少?
: d(prop) = 150 msec
A geosynchronous satellite is 36,000 km away over the sea plane.
d(prop) = 3.6e7 / 2.4e8 = 0.15 sec
: b. 請問頻寬延時乘積R*d(prop)為何?
: 150*10^-3 * 10*10^6 = 1500000 bits
omitted
: c. 假設x是照片的大小。如果微波連結要能持續傳輸,則x最小必須是多少?
: 解答直接寫600,000,000 bits
: 我不知道怎麼算來的= =
: 意思是說,一張圖片至少要傳超過60秒嗎?
Yes.
Once a picture is taken, at lease 10M*60 bits must be obtained to ensure that
the data stream is continuous until the next picture comes, 60 seconds after.
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◆ From: 220.133.1.252
※ 編輯: SimonHaykin 來自: 220.133.1.252 (11/13 11:31)
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