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Artificial Intelligence and Signal Processing (AISP2011) - Sharif University

International Symposium on Computer Networks and Distributed Systems - CNDS 2011


    Tarbiat Modares University,
    February 23–24, 2011
    Tehran, Iran, IEEE
    Areas of Interest Include: 

    • • Ad hoc and Sensor Networks
      • Cognitive Networks
      • Data Communications
      • Grid and Cluster Computing
      • Modeling and Evaluation of Communication Networks
      • Multimedia Communications
      • Network Security
      • Next Generation Networks
      • Parallel and Distributed Processing
      • Wireless Communications and Networks
    • Important Dates: October 1, 2010: Paper Submission

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    منبع
    برچسب ها : networks ,communications ,
    International Symposium on Computer Networks and Distributed Systems - CNDS 2011

UWB RADAR

    Ultra Wideband (UWB) radar systems transmit signals across a much wider frequency than conventional radar systems and are usually very difficult to detect. The transmitted signal is significant for its very light power spectrum, which is lower than the allowed unintentional radiated emissions for electronics. The most common technique for generating a UWB signal is to transmit pulses with very short durations (less than 1 nanosecond).

    The spectrum of a very narrow-width pulse has a very large frequency spectrum approaching that of white noise as the pulse becomes narrower and narrower. These very short pulses need a wider receiver bandwith as conventional radar systems.

    The amount of spectrum occupied by a signal transmitted by a UWB-radar (i.e. the bandwidth of the UWB signal) is at least 25% of the center frequency. Thus, a UWB signal centered at 2 GHz would have a minimum bandwidth of 500 MHz and the minimum bandwidth of a UWB signal centered at 4 GHz would be 1 GHz. Often the absolute bandwidth is bigger than 1 GHz.


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    منبع
    برچسب ها : signal ,very ,radar ,spectrum ,bandwidth ,than ,radar systems ,minimum bandwidth ,signal centered ,very short ,conventional radar ,conventional radar systems ,
    UWB RADAR

Introduction to Estimation Theory

    In searching for methods of extracting information from noisy observations, this chapter describes estimation theory, which has the goal of extracting from noise-corrupted observations the values of disturbance parameters (noise variance, for example), signal parameters amplitude or propagation direction), or signal waveforms.  Estimation theory assumes that the observations contain an information-bearing quantity, thereby tacitly assuming that detection-based preprocessing has been performed (in other words, do I have something in the observations worth estimating?).  Conversely, detection theory often requires estimation of unknown parameters: Signal presence is assumed, parameter estimates are incorporated into the detection statistic, and consistency of observations and assumptions tested.  Consequently, detection and estimation theory form a symbiotic relationship, each requiring the other to yield high-quality signal processing algorithms.


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    منبع
    برچسب ها : observations ,theory ,estimation ,signal ,detection ,parameters ,estimation theory ,
    Introduction to Estimation Theory

چهره های ماندگار: پروفسور رضا

    پروفسور فضل الله رضا

    از پایه گذاران نظریه اطلاعات در مهندسی برق مخابرات

    پروفسور فضل الله رضا در روز يک شنبه 5 دی ماه 1293 شمسی، در شهر رشت از استان گیلان متولد شد. در سال 1317 ، دوره کارشناسی را در رشته مهندسی برق از دانشگاه تهران به پایان رساند و در سال 1324- 1325، مدرک کارشناسی ارشد خود را در مهندسی برق از دانشگاه کسب کرد. وی در سال 1328- 1329 ، موفق به اخذ مدرک دکترا در مهندسی برق از دانشگاه موسسه فنون نیویورک گردید. در طی سال های 1329- 1334، عضو گروه مهندسی برق دانشكده مهندسی موسسه فناوری ماساچوست ، در بستون امريكا بود و ...


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    منبع
    برچسب ها : مهندسی ,دانشگاه ,پروفسور ,
    چهره های ماندگار: پروفسور رضا

The Great Radio Spectrum Famine

    Mobile broadband is consuming the available radio spectrum. Serving up more won't be easy Not even sci-fi writers foresaw what we'd be doing with our phones once technology put color screens and a lot of computing power in our pockets. Now we know: We use them to stream YouTube and Facebook videos; we watch TV shows; we download and store songs and movies; we take pictures of everything going on around us; we read (and some of us even write) novels; we play video games; we surf the Web. Sometimes we even talk to each other. These days you can unleash a gusher of bits over the air that would have choked even a wired connection to the Internet not so long ago.These transmissions consume radio bandwidth—lots of it. And they will take increasing amounts of this precious commodity as the iPad and its Androidgenous kin proliferate. People are already feeling the pinch. read more


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    منبع
    برچسب ها : even ,radio ,radio spectrum ,
    The Great Radio Spectrum Famine

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