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Register a new userدراسة و تقدير الانزياح الترددي للحوامل الجزئية في أنظمة التقسيم بالتعامد الترددي ذات الكلمة الفريدة UW-OFDM
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يهدف هذا العمل إلى دراسة و تفحص تقنيات التقدير المختلفة للانزياح الترددي للحوامل الجزئية (CFO) و ذلك من أجل أنظمة التقسيم بالتعامد الترددي ذات الكلمة الفريدة UW-OFDM حيث تم بدايةً عرض مبدأ توليد إشارة الحزمة القاعدية لأنظمة الكلمة الفريدة بالإضافة إلى ميزات هذه الأنظمة بالنسبة لأنظمة اللاحقة الدوار CP-OFDM التقليدية.
The aim of this work is to study and examine various CFO estimation techniques for word unique UW-OFDM system, where at first we introduces the principle of generating UWOFDM baseband signal and lists the advantages of using this scheme over conventional CPOFDM systems.
References used
M. Huemer, C. Hofbauer, and J. Huber, " Classical and Bayesian Linear Data Estimators for Unique Word OFDM ", IEEE Transactions on Signal Processing, vol. 59, no. 12, pp. 6073_6085, Dec. 2011
M. Huemer, C. Hofbauer, and J. Huber, "The Potential of Unique Words in OFDM", International OFDM Workshop, Hamburg, Germany, 2010
J. L. Holsinger, "Simple carrier frequency offset estimators for flat-fading channels" in Proceedings of IEEE International Conferene on Communica-tions (ICC), Glasgow, Scotland, June 2007
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يعتبر نثر الطيف بالقفز الترددي Frequency Hopping Spread Spectrum (FHSS) من التقنيات التي تؤمن
مناعة لأنظمة الاتصالات الحديثة ضد التشويش Jamming و الاعتراض Intercept لدرجة تعتبر نوعاً ما جيدة. و لكن
يبقى هذا النظام عرضة للهجوم و خاصة إذا ما تواجدت ث
غرات في تصميم النظام ككل، و بمراحل و خوارزميات التزامن على وجو الخصوص؛ لما تمثله من أهداف سهلة للهجوم الالكتروني.
This paper presents the development and evaluation of BroadBand Electrically Steerable
Parasitic Array Radiator antenna by using eight parasitic radiators BB-ESPAR-8 .
The antenna has a symmetrical structure that consists of: i- one active element as a broad band
shuttle antenna, ii- eight wideband parasitic radiators, iii- cylindrical ground plane, iv- set of
reactances.
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This article presents a new method of Direction Of Arrival (DOA) estimation technique using Multiple
Signal Classification ( MUSIC ) algorithm. This method is applied to communication signals that work
in broadband frequency by using a single RF port of Broad-Band ESPAR Antenna, with eight parasitic
radiators (BB-ESPAR-8).
This paper presents a study of the possibility of improving the
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Modulation (LFM) using signals pairs, uplink and downlink, to get
rid of the negative interference signals, with the use of
packet filters
opposite narrow area dedicated to measuring the goal. The output of
these packet filters is connected to subtractor circuit, so the reflected
signals from fixed objects (negative interference) excite filters have
the same arrangement leading to subtracting it, and the reflected
signals from a moving target will vary its frequency value of the
offset Doppler "fd" and thus excite different filters arranged to pass
through the subtraction circuit without being deleted.
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