Do you want to publish a course? Click here

Flexible 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

726   0   1   0 ( 0 )
 Publication date 2006
and research's language is العربية
 Created by Shamra Editor




Ask ChatGPT about the research

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.


Artificial intelligence review:
Research summary
تناقش الورقة البحثية المعايير والتقنيات المستخدمة في الاتصالات اللاسلكية الرقمية، مع التركيز على نظام IS-95 المعروف أيضًا باسم CDMA. يتم تسليط الضوء على جودة الخدمة (QoS) وإعادة تهيئة البرمجيات (Software Reconfigurability) كعناصر أساسية لتحسين أداء الأنظمة اللاسلكية. تتناول الورقة أيضًا تقنيات مثل GSM وWCDMA، وتستعرض الفروق بينها وبين IS-95 من حيث معدل نقل البيانات، عرض النطاق الترددي، وتقنيات الانتشار. يتم تحليل أداء IS-95 من خلال مقاييس مثل معدل الخطأ في البت (BER) وتأثير التلاشي (fading) على الإشارة. كما يتم مناقشة استخدام تقنيات مثل مستقبل RAKE لتحسين استقبال الإشارة في بيئات متعددة المسارات. تُختتم الورقة بمناقشة تطبيقات التكنولوجيا مثل FPGA وDSP في تحسين أداء الأنظمة اللاسلكية.
Critical review
دراسة نقدية: تقدم الورقة نظرة شاملة على تقنيات الاتصالات اللاسلكية، ولكنها تفتقر إلى بعض التفاصيل الحديثة التي قد تكون مفيدة لفهم التطورات الأخيرة في هذا المجال. كما أن التركيز الكبير على IS-95 قد يكون محدودًا بالنظر إلى التقدم السريع في تقنيات الاتصالات مثل 5G. كان من الممكن أن تكون الدراسة أكثر شمولية إذا تضمنت مقارنة أعمق مع الأنظمة الأحدث. بالإضافة إلى ذلك، فإن الورقة تعتمد بشكل كبير على المصادر القديمة، مما قد يؤثر على دقة المعلومات المقدمة في السياق الحالي.
Questions related to the research
  1. ما هو نظام IS-95 المعروف أيضًا باسم CDMA؟

    نظام IS-95 هو معيار للاتصالات اللاسلكية يستخدم تقنية تقسيم الشفرة للوصول المتعدد (CDMA) لتحسين كفاءة استخدام الطيف وتقديم خدمات اتصالات موثوقة.

  2. ما هي أهمية جودة الخدمة (QoS) في الاتصالات اللاسلكية؟

    جودة الخدمة (QoS) مهمة في الاتصالات اللاسلكية لأنها تضمن تقديم مستوى معين من الأداء للمستخدمين، بما في ذلك معدلات نقل البيانات، تأخير الإرسال، ومعدل الخطأ في البت.

  3. كيف يساهم مستقبل RAKE في تحسين استقبال الإشارة في بيئات متعددة المسارات؟

    يعمل مستقبل RAKE على تحسين استقبال الإشارة في بيئات متعددة المسارات عن طريق جمع الإشارات المستقبلة من مسارات متعددة، مما يزيد من قوة الإشارة ويقلل من تأثير التداخل والتلاشي.

  4. ما هي الفروق الرئيسية بين تقنيات GSM وWCDMA وIS-95؟

    تختلف تقنيات GSM وWCDMA وIS-95 في معدلات نقل البيانات، عرض النطاق الترددي، وتقنيات الانتشار. GSM يستخدم TDMA، بينما يستخدم WCDMA وIS-95 تقنية CDMA، مع اختلافات في معدلات الشفرة وعرض النطاق الترددي.


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
rate research

Read More

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.
In this paper, we present approximate solutions for the Advection equation by finite differences method. In this method we convert the nonlinear partial differential equation into a system of nonlinear equations by some finite differences methods. 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 results for Advection equation.
Morphological tasks have gained decent popularity within the NLP community in the recent years, with large multi-lingual datasets providing morphological analysis of words, either in or out of context. However, the lack of a clear linguistic definiti on for words destines the annotative work to be incomplete and mired in inconsistencies, especially cross-linguistically. In this work we expand morphological inflection of words to inflection of sentences to provide true universality disconnected from orthographic traditions of white-space usage. To allow annotation for sentence-inflection we define a morphological annotation scheme by a fixed set of inflectional features. We present a small cross-linguistic dataset including semi-manually generated simple sentences in 4 typologically diverse languages annotated according to our suggested scheme, and show that the task of reinflection gets substantially more difficult but that the change of scope from words to well-defined sentences allows interface with contextualized language models.
Decoupling the decision-making process from the data forwarding process is the heart of software-defined networks technology. One of the most important components of this 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.

suggested questions

comments
Fetching comments Fetching comments
Sign in to be able to follow your search criteria
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا