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可以提供比位元交錯編碼調變更佳的錯誤效能。對位元交錯編碼調變使用相差編碼，並在接收端作非同調檢測，可以避免傳送前導符元所造成的速率損失問題。在本篇論文中，我們研究使用16APSK訊號的相差位元交錯編碼，並設計相差編碼所對應的表，以簡化作相差編碼時的複雜度，以及設計新的相差編碼，模擬結果顯示新相差編碼錯誤效能在高訊雜比下有較好。除此之外，對碼率為3/4的迴旋碼作搜尋，嘗試尋找更好的迴旋碼。 ;Bit-Interleaved Coded Modulation(BICM)and BICM with iterative decodingare suitable for continuous channel fading channels.BICM using differential encoding in transmitter and noncoherent receiver can avoid the rate loss due to pilot symbol. In this paper, we investigatedifferential encoding for bit interleaved coded of 16APSK. Design new differential encoding and corresponding table to simplify the complexity of differential encoding.Simulation results show that the new encoding has better performance. Try to find a better convolutional code for code rate of 3/4.
