Muhanned I. alfarras
Abstract
Abstract The goal for the next generation mobile communication system is to seamlessly integrate a wide variety of communication services such as high speed data transmission , video ...
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Abstract The goal for the next generation mobile communication system is to seamlessly integrate a wide variety of communication services such as high speed data transmission , video and multimedia traffic as well as voice signal . The technology needed to tackle the challenges is to make these services available , popularly known as the third generation ( 3G ) cellular system . One of the most important promising approaches to 3G is to combine turbo coding and diversity in the system . Turbo codes are one of the most powerful types of error control codes currently available . Turbo encoder is built using a concatenation of two recursive systematic convolutional ( RSC ) codes . On the other hand , the decoder depends on the a posteriori algorithm . Diversity is a well - known technique for improving performance in mobile radio communication at a relatively low cost . The paper investigates the effect of turbo coding in the 3G system with diversity . The bit error rate performance of the system with AWGN channel is investigated to study the effect of number of iterations , frame size , code rate and memory size of the symmetrical convolutional code . It then assesses the performance of the system over mobile fading channel that exhibits Rayleigh multipath . In the performance assessment , the bit error rate for different mobile speeds , different frame sizes , different number of states in the encoder and different number of iterations in the decoding were also investigated . The assessment also compares the performance with and without diversity .
