我們在本研究專題中探討一新型的正交多工相位調變信號[1]( Orthogonally-Multiplexed Orthogonal Phase Modulation,簡稱OMOPM )性能。在本報告中，我們探討同調偵測( Coherent detection )及差分同調偵測( Differential Coherent detection ) 的正交相位多工(OMOPM)接收機以最佳化解調[1]( Optimum Demodulation )與次佳化解調( Sub-optimum Demodulation )的性能。我們除了以數學分析的方法探究及比較此二種接收方式的性能外，我們也以電腦模擬的方式驗證數學分析結果的正確性。最後我們得到的結論是：當載波之相位字母大小K或構成元件之載波個數L愈大時，採用次佳化同調的接收性能將愈接近最佳化同調的性能。而且構成元件之載波個數L=1時，其採用次佳化差分同調的接收性能將幾乎和最佳化差分同調的性能相同。 A novel class of coherent Orthogonally Multiplexed Orthogonal Phase Modulation [1](OMOPM) signals is investigated in this project. We present the performance analysis for the coherent and differentially coherent OMOPM sub-optimum receiver. The results of computer simulation are also given to verify the analysis in both cases. We also compare the performance between the optimum [1] and sub-optimum OMOPM receivers. We conclude that the larger alphabet and symbol sizes (i.e. K and L) are, the performance of the receivers employing sub-optimum coherent scheme will get closer to that of the optimum one. When the supersymbol is consisted of 1symbols (i.e. L=1), the performance of the sub-optimum differentially coherent receiver is nearly the same as the optimum differentially coherent receiver.
