تحسين أداء نظام MIMO-OFDM باستخدام الترميز الالتفافي والتحويل المويجي المتقطع
Abstract
يقدم البحث طريقة جديدة لتحسين أداء نظامMultiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) عن طريق إنقاص معدل خطأ البتBit Error Rate (BER) باستخدام كل من الترميز الالتفافيConvolutional Coding (CC) والتحويل المويجي المتقطعDiscrete Wavelet Transform (DWT). تم نمذجة نظام OFDM بهوائي وحيد في طرف الإرسال وهوائي وحيد في طرف الاستقبالSingle Input Single Output (SISO), ومن ثم تحسينه بتقنية Multiple Input Single Output (MISO)عبر إضافة هوائي ثانٍ في طرف الإرسال, وبتقنية MIMO عبر إضافة هوائي ثان ٍفي طرف الإرسال وهوائي ثانٍ في طرف الاستقبال,ومن ثم تحسين نظام MIMO-OFDMباستخدام الترميز الالتفافي بمعدل ترميز 1/2, ثم باستخدام التحويل المويجي المتقطع بعائلة Haar بدلاً من (FFT)Fast Fourier Transform, ثم باستخدام كل من الترميز الالتفافي والتحويل المويجي المتقطع معاًعلماً أن قنوات الاتصال المستخدمة في الدراسة هي قنوات خفوت نوع ريسيانRician و رايلي Rayleigh وأن التعديل المستخدم هوBinary Phase Shift Keying (BPSK) وأن عدد الحوامل الترددية 64.يعتمد البحث على دراسة BER تبعاً لطاقة البت إلى كثافة طاقة الضجيج Eb/N0 وذلك باستخدام برنامج MATLAB.وتظهر النتائج أن استخدام كل من الترميز الالتفافي والتحويل المويجي المتقطع في نظام MIMO-OFDMيقلل Eb/N0 بمقدار3.4 dBمرة بحالة قناة خفوت رايليو بمقدار4.6 dBمرة بحالة قناة خفوت ريسيان عندما يكون BER= .
This research introduce a new method to improve performance of Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system by decreasing Bit Error Rate(BER) usingboth Convolutional Coding (CC) and Discrete Wavelet Transform (DWT). OFDM system is modeled with one antenna at the sending side and a single antenna at the receiving side Single Input Single Output (SISO), and then enhancing it with Multiple Input Single Output (MISO) technique by adding a second antenna at the sender besides using MIMO technique which adds a second antenna at each of the sender and receiver and then Improving the MIMO-OFDM system using the Convolutional Coding with 1/2 coding rate, and replacing the Fast Fourier Transform (FFT) with DWTfrom Haar family knowing that the used communication channels in this study are Rician fading channel and Rayleigh fading channel. The used modulation is Binary Phase Shift Keying (BPSK) and the number of carriers is 64. This research studies the BER as function to Eb/N0 using MATLAB. The results show thatthe use of both CC and DWTin MIMO-OFDM system reduceEb/N03.4 dB times in Rayleigh fading channel and 4.6 dBtimes in Rician fading channel when BER= .
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