| Summary: | 碩士 === 國立交通大學 === 電子工程系 === 89 === Turbo codes have been shown to provide very good error correction performance over AWGN channels. Recently, turbo codes with different interleaver designs over AWGN channels have gained a lot of attention because using some specific interleaver design criteria a superior error performance can be obtained.
In this thesis, we consider the applicability of such codes to the WCDMA systems for third generation mobile communication systems. Especially, the effects of several interleaver designs for turbo codes are discussed and compared. Besides, we use the turbo codes with CRC check to control the number of iterations to reduce the decoding time. The simulation results indicate that the performance of the turbo codes, using different interleaver designs, is almost the same over Rayleigh fading channels. Also, the turbo codes with CRC check to control iteration number can reduce the decoding time significantly without degrading the performance.
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