![](/images/graphics-bg.png)
Adjacent channel interference reduction in OFDM systems
العناوين الأخرى
تخفيض تداخل الإشارات المتجاورة في أنظمة التقسيم الترددي المتعدد التعامدي
مقدم أطروحة جامعية
مشرف أطروحة جامعية
الجامعة
جامعة مؤتة
الكلية
كلية الهندسة
القسم الأكاديمي
قسم الهندسة الكهربائية
دولة الجامعة
الأردن
الدرجة العلمية
ماجستير
تاريخ الدرجة العلمية
2016
الملخص الإنجليزي
Orthogonal frequency division multiplexing (OFDM) is a promising candidate for cognitive radio transmission.
OFDM supports high data rates that are robust to channel impairments.
However, one of the biggest problems for OFDM transmission is high out off band radiation, which is resulted from the sidelobes of the OFDM subcarriers.
These sidelobes are a source of interference to neighbouring transmissions.
This thesis focuses on reducing the out-of-band radiation by reading and extracting the radiation power in the sidelobes.
This is done by extending the time domain OFDM signal by zeros in both sides.
The resulted signal is then transformed to the time domain and extended samples are removed to obtain the N-samples of time domain signal represent the out-of-band radiated signal.
The resulted signal is Fourier transformed and high frequency sub-carriers are removed to obtain pilots that are inversed and added to the original OFDM data sub-carriers resulting in reducing the Adjacent Channel Interference (ACI), which affects the adjacent systems.
The added signal represents noise signal to the desired OFDM signal that reduces the BER performance of the desired system, thus a weighting factor is applied to the added signal to get a better BER performance with good out-of-band radiation reduction.
Matlab/Simulink simulation is adopted to perform assessment of the proposed technique with different weighting factors and different frequency separation between the desired signal and the adjacent one.
For 0 dB attenuation on the added signal, a 10 dB reduction in out-of-band radiation is obtained while 6 dB reduction is obtained when the weighing factor reduces the input signal power by 3 dB.
BER performance is better by performing the reduction technique and depends on the frequency distance between the adjacent signal and the desired one
التخصصات الرئيسية
عدد الصفحات
44
قائمة المحتويات
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Literature review.
Chapter Two : ACI in OFDM system.
Chapter Three : Proposed technique for ACI reduction.
Chapter Four : Conclusion and future work.
References.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Rafah, Arwa Walid Mustafa. (2016). Adjacent channel interference reduction in OFDM systems. (Master's theses Theses and Dissertations Master). Mutah University, Jordan
https://search.emarefa.net/detail/BIM-762651
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Rafah, Arwa Walid Mustafa. Adjacent channel interference reduction in OFDM systems. (Master's theses Theses and Dissertations Master). Mutah University. (2016).
https://search.emarefa.net/detail/BIM-762651
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Rafah, Arwa Walid Mustafa. (2016). Adjacent channel interference reduction in OFDM systems. (Master's theses Theses and Dissertations Master). Mutah University, Jordan
https://search.emarefa.net/detail/BIM-762651
لغة النص
الإنجليزية
نوع البيانات
رسائل جامعية
رقم السجل
BIM-762651
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
![](/images/ebook-kashef.png)
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر
![](/images/kashef-image.png)