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In this paper, a novel maximum Doppler spread estimation algorithm for mobile communication systems is proposed. The proposed algorithm uses a fast Fourier transform (FFT) o f received pilot signals, which are related with the maximum Doppler frequency f,. The proposed algorithm does not need to know any other channel information such as signal to noise ratio(SNR) because o f using only the distribution o f a fading channel power spectrum. Especially, the proposed algorithm shows good performance over wide Doppler frequency in low SNR ( < IOdB).

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The several implementation methods of the MAP decoder are proposed in this paper By using the novel time-shared process of a pipe-lined stmcture, the mm.ction of recursion process on state metric can be @ciently conquered, and the complexity of the u4P decoder can be reduced to the onier of a SOK4.(sofi &put Eterbi Algorithm) decodm And, an eficient structure for the conholler is ako proposed for cha-2000 system. The designed URP decoder using a block-wire iU4P algorithm has been hplemented in only one 20,000 gate cimit. It has been valiabted Ly l?T3DL, which has been compared with the results of the initial simulation(C programs). The designed decoder has 300 kbps decodingprocessing abiIity with 8 times iterations on a FPGA circuit. andjwt h a a deviation of about 0 . 1 4 2 dB over the ideal MAP &code6 even if all haniwam environments were considemd.