Performance evaluation and enhancement of third generation mobile system

الملخص EN

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 Ja.

ta.

ckle 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 A WGN 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.