位元交錯編碼調變是適合連續衰退通道的通道碼，而位元交錯編碼調變加上遞迴解碼則可提供比位元交錯編碼調變更佳的錯誤效能。因為使用前導符元估測通道係數的同調位元交錯編碼調變會造成速率損失，所以我們在位元交錯編碼調變(或使用遞迴解碼之位元交錯編碼調變)的傳送端使用相差編碼，並使用不同的非同調接收端，以電腦模擬其錯誤效能。在本篇論文中，我們使用了三種不同位元計量，其在雷列連續衰退通道下可以比一般使用前導符元的做法達到更佳的錯誤效能。我們更進一步使用遞迴解碼，經由模擬發現使用遞迴解碼之位元交錯編碼調變，其錯誤效能皆比無遞迴解碼之位元交錯編碼調變佳。 Bit-Interleaved Coded Modulation (BICM) is a suitable channel coding in continuous fading channel. BICM with iterative decoding (BICM-ID) can provide better performance than BICM. But using pilot symbols will cause rate loss, so we add a differential encoder at the transmitter, and try different noncoherent receivers. We use computers to simulate the BICM (or BICM-ID) systems. In this thesis, we try three different metrics which can achieve better error performance than the system which uses pilot symbols. We further adopt iterative decoding at the receiver, and we observe that BICM-ID have better performance than BICM by simulation.
