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Register a new userFlexible Rake Receiver for User-Defined QoS Based on Software Defined Radio
مستقبل مشطي مرن لنوعية خدمة محددة من قبل المستثمر بالاعتماد على نظم الاتصالات اللاسلكية المحددة برمجي
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Added by
Damascus University ورقة بحثية
Publication date
2006
fields
Communication Engineering
and research's language is
العربية
Created by
Shamra Editor
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نقدم في بداية هذه الورقة تمهيداً عن نظم الاتـصالات اللاسـلكية المحـددة برمجيـاً، ثـم نستعرض في الفقرة الثانية بشكل سريع أهم خصائص المعيار 95-IS و سبل رفـع نوعيـة الخدمة فيه، و بعد تعرف موجز على أهم تأثيرات الخفوت في الفقرة الثالثة؛ نقوم في الفقرة الرابعة بتحليل مبدأ المستقبل المشطي. و نعتمد في الفقرة الخامسة على نتائج المحاكاة فـي التصنيف الفعال لعدد الأصابع المتغير في المستقبل المشطي المرن بحسب مستوى نوعيـة الخدمة المحدد من المستثمر، حيث نبين أهمية ذلك في الاستخدام الأمثـل لمـوارد الكيـان الجامد المخصصة لأداء وظائف معالجة الإشـارة الرقميـة، و فـي تخفـيض الاسـتطاعة المستهلكة اللازمة لهذه الوظائف.
In the introduction of this paper, we present a background on SDR, in section 2, we give a quick demonstration of main IS-95 features and ways to improve QoS in it. After a short recognition of key fading effects in section 3, we analyze in section 4 the principle of Rake reception. In section 5, we use simulation results to effectively categorize variable number of fingers of the flexible Rake receiver upon user defined level of QoS, and we show the importance of such approach in effectively utilizing hardware resources dedicated for performing digital signal processing tasks, and in reducing power consumption required for these tasks.
References used
H. Sari, M. Chiani, "Wireless Digital Communications: Systems and Technologies", Arab School for Science and Technology, Wireless Digital Communications Session, February 2006
B. Enrico, "The Software Radio Concept", IEEE Communications Magazine, September 2000, pp. 138-143
W.H. Tuttlebee Et al, "Software Defined Radio, Baseband Technologies for 3G Handsets and Basestations", John Wily, 2004
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In the introduction of this paper, we present a background on SDR, in
section 2, we give a quick demonstration of main GSM features and ways to
improve QoS in it. After a short recognition of key fading effects in section
3, we analyze in section
4 the Soft Output Viterbi Algorithm used to
perform equalization tasks in GSM. In sections 5 and 6, we use simulation
results to effectively categorize variable parameters of the flexible equalizer
upon user defined level of QoS. We show also the importance of such
approach in effectively utilizing hardware resources dedicated for
performing digital signal processing tasks, and in reducing power
consumption required for these tasks.
نظم الاتصالات اللاسلكية المحددة برمجيًا
نوعية الخدمة المحددة من المستثمر
النظام العالمي للاتصالات النقالة
خوارزمية Viterbi ذات الخرج اللين
المسوي المرن
(Software Defined Radio (SDR
user defined QoS
(Global System for Mobile communications (GSM
(Soft Output Viterbi Algorithm (SOVA
flexible equalizer
المزيد..
In this paper, we present approximate solutions for the
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Then this
system was solved by Newton's method. And we made a program
implementing this algorithm and we checked the program using
some examples, which have exact solutions, then we evaluate our
results. As a conclusion we found that this method gives accurate
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Decoupling the decision-making process from the data forwarding process is the heart of
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technology is the controller, which is the smartest component in the network.
Many of the
controllers have been developed since the technology originated, and many researches
have been done to compare the performance of these controllers for productivity, delay and
protection.
And due to the importance of selecting the appropriate controller according to different
parameters and network states, we studied the performance of four controllers: Floodlight,
Beacon, Nox, RYU in terms of productivity, RTT, time of establishing connection with an
OpenFlow switch and the time for adding an input to the switch flow table. The results
showed that the Beacon control was superior in performance when the number of switches
in the network was equal to the number of processor cores used by the controller. For RTT
and the time needed to add an input to the flow table, the NOX controller achieved less
time. Finally, the Floodlight controller was the best in terms of establishing connection
with the switch because it needed less time.
Software Defined Networks (SDN) is the qualitative movement in the field of networks due to that fact that it separates the control elements from the routing elements, and the function of the routing elements was limited to the implementation of the
decisions that are sent to it by the controller through the OpenFlow Protocol (OF) which is mainly used in SDN. We explain in this paper the benefit of the new concept which is presented by SDN and it makes network management easier, so instead of writing the rules on each device, we program the application in the controller, and the infrastructure devices run the received commands from the controller. In order to achieve the best performance of this technology, a Quality of Service (QoS) must be applied within it, where it includes several criteria, the most important are the used bandwidth, delay, packet loss and jitter. The most important of these criteria is the bandwidth, because by improving this standard, we can improve the rest of the other criteria. Therefore, in this paper, we provide the necessary improvement on the RYUcontroller to use the best bandwidth, which improves the quality of service in SDN.
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