一份研究生毕业论文。详细阐述了上海地铁无线调度系统的设计，400MHz异频，单双工方式，是不可多得的好文章，乃本人花银子所得，现在贡献出来，供大家学习参考。-A post-graduate thesis. Elaborated on the Shanghai metro wireless dispatch system design, 400MHz different frequency, restricting the public way, is rare good article, I S