Both the modulation and demodulation techniques and the coding techniques have been involved in the system, and have been combined by TCM to improve the performance.
它涉及了调制解调技术、编解码技术两大关键技术，并采用TCM技术将两者结合起来，使得系统性能进一步提高。
Chapter3: This chapter discusses the quantum cryptography system based on phase modulation polarization coding technology in details.
第三章：详细讨论了基于相位调制偏振编码的量子保密通信系统。
The system also supports two level hierarchical channel coding and modulation, including uniform and multiresolution constellation.
系统还支持两层次式通道编码与调变，包括均匀与多分辨率群集。
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