الفهرس 
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Abstract
Turbo codes are considered one of the most important error correcting codes, which
are used in wireless communication systems. They are distinguished with their eflicicnt performance. Scientific researches are conducted to apply these codes in the third generation (3G) mobile. Turbo codes have great capability to correct most of errors in received codes especially in fading channels. The hard - and soft - decision Viterbi decoders are discussed .
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The performance of turbo codes 111 A WGN channel uSll1g a MATLAB computer simulation program is invesiigated. The main parameters, which afTect the turbo codes performance, such as the number of iterations used in decoding process, the frame size of input data, and the generator polynomials used in the component codes, are discussed.
Nakagami-m- fading channel model is explained II spans with one distribution, the entire range from one-sided Gaussian fading channel (including Rayleigh fading and Rice fading channels) to a non-fading [9].
The maXImum a posteriori (MAP) algorithm and the feedback decoder used in decoding turbo codes are introduced. The BER performance of turbo codes in Rayleigh fading channel ( for different code rates, frame lengths, and different iterat,ions number ) is examined. The BER performance of turbo codes in Nakagami-m fading channel with the same previous parameters is also discussed .