渦輪編碼么正空時調變可以提供相較於未編碼的么正空時調變(USTM)更多的編碼增益，當串接低密度查核位元碼時嚮導符元協助調變也被證明相較於么正空時調變有更好的錯誤效能。由於最大後置非同調機率解碼器在較長區塊長度下複雜度太高,因此具低複雜度的非同調通道量化重複解調器與重複決策回授解調器被提出,在此篇論文中，我們主要討論使用在渦輪編碼系統之非同調重複空時解調器。我們一般化非同調通道量化重複解調器與重複決策回授解調器兩種非同調解調器，並比較使用不同的非同調重複解調器在渦輪編碼嚮導符元協助調變上之錯誤效能。

Turbo coded unitary space-time modulation (USTM) can provide large coding gain as compare to uncoded USTM. Concatenated with a low-density parity-check code, pilot symbol-assisted modulation (PSAM) was shown to have better error performance than USTM. Because the noncoherent space-time maximum a posteriori demodulator is very complicated especially for long block length, the noncoherernt iterative channel-quantization demodulator and iterative decision-feedback demodulator with lower complexity were proposed. In this thesis, we focus on noncoherent iterative space-time demodulators for turbo coding systems. We generalize Noncoherent iterative channel-quantization demodulator and iterative decision-feedback demodulator. We also investigate the error performance of various noncoherent iterative demodulators for turbo coded PSAM.

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