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الموضوع: water wirless commuincation

  1. #1
    عضو
    تاريخ التسجيل
    Jul 2009
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    water wirless commuincation



    السلام عليكم ورحمة الله وبركاته :
    فى البداية كل عام وانتم بخير بمناسبة شهر رمضان

    هدف الموضوع هو استفسار عن شىء فارجو ممن يعرف ان يشارك برأيه ولكم جزيل الشكر
    انا وزمايلى بنفكر فى مشروع التخرج فى مجال الاتصالات ففكرت فى فكرة مش عارف ممكن تتنفذ فى يوم من الايام وهى water wireless communication هدف المشروع هو نظام نقل data wireless بس من خلال الماء بس كلنا نعرف ان الماء غير الهواء كثافة الماء هتأثر على سرعة data وفى تأثيرات تانية .
    المهم ياريت من أى حد عنده خلفية عن الموضوع أو يعرف أى حاجة أو أى موقع بيكلم عن الموضوع ده يشارك برأيه .
    لو الفكرة اتنفذت فى حاجات كتير صعبة هتصبح سهلة

  2. #2
    عضو برونزي الصورة الرمزية Gawad
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    Nov 2009
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    رد: water wirless commuincation

    بسم الله والحمد لله والصلاة و السلام علي رسول الله وآله وصحبه وإخوانه أجمعين:



    After the passenger liner sank in April 1912, its exact whereabouts remained a mystery until 1985, when the Woods Hole Oceanographic Institution’s imaging vehicle finally located the wreckage.
    When the robotic vehicle honed in on the craft, its success underscored a greater need for better underwater communications, especially those that would require no cables. Wireless communications, signal processing and detection underwater are the areas of specialty for Stojanovic, a newly hired electrical engineering associate professor at Northeastern.
    “When the Titanic sank, people knew approximately where it went down, but it wasn’t until Woods Hole designed that small robotic vehicle that we knew the truth,” Stojanovic said. “When that robot was sent down, it was attached to a long cable connecting it to a surface ship. The cables are very expensive and heavy, and they limit the movement of the robot. There are applications that would greatly benefit from the ability to communicate underwater without cables.”
    Future applications could enhance myriad industries, ranging from the offshore oil industry to aquaculture to fishing industries, she noted. Additionally, pollution control, climate recording, ocean monitoring (for prediction of natural disturbances) and detection of objects on the ocean floor are other areas that could benefit from enhanced underwater communications.
    “Oceans cover about 70 percent of the Earth’s surface, and much of this vast resource remains to be explored,” Stojanovic said. Unlike above-water communications developments, which have brought us instantaneous cell phone conversations, wireless Internet and myriad other advances, underwater communications lags behind.
    Her research focuses on finding better ways of transmitting acoustical signals in hopes of improving capacity to the point where underwater robots no longer have to be chained by a heavy, expensive communications cable, but can instead transmit their readings to other robots, or to shipboard researchers.
    “There is a need to improve the wireless communication capacity of underwater robots. Just think about the dangers of landmines. We also have underwater mines. We need robots that can find and neutralize the mines beneath the water” without endangering humans, she said. “These robots need to be able to talk to each other if they are going to perform their task efficiently.”




    Yet, water puts a damper on communication capacity, slowing down the signal propagation and creating background noise and echoes—all problems she trains her analytical mind toward solving. Among other research areas, Stojanovic focuses her energies on creating clearer signals through “equalization” to solve the echo problem.
    Further research interests take her into creation of underwater networks. For underwater instruments to communicate underwater, they must mimic the communication networks on land. Yet, the slow speed at which signals travel would turn an underwater conversation into garble, she said. “If multiple people talk at the same time, their signals will collide,” she said. “We need protocols that will orchestrate multiple conversations.”
    Stojanovic, who received her master’s and doctorate degrees in electrical engineering from Northeastern, began her research focus while working as a postdoctoral fellow at the Woods Hole Oceanographic Institution. She jokes that she “never surfaced” from her earliest underwater communications work.
    Growing up in Serbia, she received her undergraduate degree at the University of Belgrade, and also met her future husband. Together, she and Zoran Zvonar came to Northeastern to study electrical engineering.
    Prior to joining the faculty, where her courses include undergraduate communications systems and linear systems, she was a principal scientist at the MIT Sea Grant College and the MIT Department of Aeronautics and Astronautics.
    She has produced numerous published works, and most recently was a guest editor for “IEEE Communications Magazine,” for the feature story “Underwater Wireless Communication and Networks,” 2009.
    Reflecting on her career in undersea communications, Stojanovic said the passion found her. “I’m not sure we ever decide what we want to be,” she said. “Things just happen that way.”
    [CENTER][SIZE=4][COLOR=Blue]اللهم صلي على محمد وعلى آل محمد كما صليت على آل إبراهيم وبارك على محمد وعلى آل محمد كما باركت على آل إبراهيم في العالمين إنك حميد مجيد[/COLOR][/SIZE]

    [B][SIZE=4]اللهم احفظ مصر آمنة مطمئنة وسائر بلاد المسلمين
    اللهم قنا الفتن ما ظهر منا وما بطن
    [/SIZE][/B]
    [/CENTER]

  3. #3
    عضو برونزي الصورة الرمزية Gawad
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    رد: water wirless commuincation

    بسم الله والحمد لله والصلاة والسلام علي رسول الله و آله وصحبه وإخوانه أجمعين:
    راجع أيضاً هذا الموقع فهو متخصص في نقل البيانات تحت الماء
    http://www.ambalux.com/technology.html
    وصلي الله وسلم وبارك علي المصطفي و آله وصحبه وإخوانه أجمعين
    [CENTER][SIZE=4][COLOR=Blue]اللهم صلي على محمد وعلى آل محمد كما صليت على آل إبراهيم وبارك على محمد وعلى آل محمد كما باركت على آل إبراهيم في العالمين إنك حميد مجيد[/COLOR][/SIZE]

    [B][SIZE=4]اللهم احفظ مصر آمنة مطمئنة وسائر بلاد المسلمين
    اللهم قنا الفتن ما ظهر منا وما بطن
    [/SIZE][/B]
    [/CENTER]

  4. #4
    عضو برونزي الصورة الرمزية Gawad
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    رد: water wirless commuincation



    A researcher at the Northeastern University is looking to improve underwater communications, but first she decided to explain why is this necessary by giving the Titanic as an example. Milica Stojanovic reminds us that the big boat sank in 1912 and that we knew approximately where it was, but it took almost 73 years to discover the exact location of the Titanic.
    The passenger liner was discovered thanks to an imaging vehicle of the Woods Hole Oceanographic which was far from being a perfect robot – it was heavy and moved slowly because it required cables (I guess I don’t have to specify the fact that these cables are very expensive). Better underwater wireless communications would mean that the imaging machines would not require expensive cables, and no cables would mean that the robots will become more agile in the water.
    “When the Titanic sank, people knew approximately where it went down, but it wasn’t until Woods Hole designed that small robotic vehicle that we knew the truth. When that robot was sent down, it was attached to a long cable connecting it to a surface ship. The cables are very expensive and heavy, and they limit the movement of the robot. There are applications that would greatly benefit from the ability to communicate underwater without cables,” said Stojanovic.
    If we would improve underwater wireless communications, it will have enormous implications in various industries and domains, including offshore oil industry, fishing industry, aquaculture, pollution control, ocean monitoring, object detection, and climate recording. Stojanovic underlined the importance of above water wireless communications as they brought us wireless Internet and cellphone connections among others. However, underwater communications remain far behind so Stojanovic dares us to think of the benefits that this technology will bring.
    “Oceans cover about 70 percent of the Earth’s surface, and much of this vast resource remains to be explored,” she said.
    The Northeastern University researchers also thinks about the dangers that can be found in the water and thinks of another importance of the underwater wireless communications.
    “There is a need to improve the wireless communication capacity of underwater robots. Just think about the dangers of landmines. We also have underwater mines. We need robots that can find and neutralize the mines beneath the water [without endangering humans]. These robots need to be able to talk to each other if they are going to perform their task efficiently,” said Stojanovic.
    However, wireless underwater communications bring a lot of problems as water slows down the signal, it creates a background noise, and echos. Stojanovic is now focusing to eliminate the echo issue and to get better signals thanks to equalization. Also, she wants to develop underwater wireless networks, but the slow speed is not an advantage at all.
    “If multiple people talk at the same time, their signals will collide. We need protocols that will orchestrate multiple conversations,” she said.
    For the moment the study is only at the beginning with minimum results so far. What should we expect? Well, Stojanovic forgot to mention that. So, what do you think? Is it possible to desing underwater wireless communications?
    [CENTER][SIZE=4][COLOR=Blue]اللهم صلي على محمد وعلى آل محمد كما صليت على آل إبراهيم وبارك على محمد وعلى آل محمد كما باركت على آل إبراهيم في العالمين إنك حميد مجيد[/COLOR][/SIZE]

    [B][SIZE=4]اللهم احفظ مصر آمنة مطمئنة وسائر بلاد المسلمين
    اللهم قنا الفتن ما ظهر منا وما بطن
    [/SIZE][/B]
    [/CENTER]

  5. #5
    عضو برونزي الصورة الرمزية SyrianCyclone
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    Dec 2005
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    رد: water wirless commuincation

    موضوع شيق والله

    مشكور اخ جواد على المعلومات
    [CENTER][COLOR="Red"][SIZE="4"] الموت لكل خائن , خان وطنه و اهله [/SIZE][/COLOR][/CENTER]

    [CENTER][SIGPIC][/SIGPIC][/CENTER]


    [CENTER][IMG]http://folding.extremeoverclocking.com/sigs/sigimage.php?un=SyrianCyclone&t=155660[/IMG][/CENTER]

  6. #6
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    رد: water wirless commuincation



    شكرا للجميع وجزاكم الله كل خير

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