毕业论文-通信信号调制.doc

学号： 110****** 话音信号的2DPSK调制系统 学院名称： 物理与信息工程学院 专业名称： 电子信息工程 年级班别： 2011级电信112 姓 名： ****** 指导教师： ******* 2015年05月 摘 要 现代通信系统要求通信距离远、通信容量大、传输质量好。作为其关键技术之一的调制技术一直是人们研究的一个重要方向。从最早的模拟调幅调频技术的日臻完善，到现在数字调制技术的广泛运用，使得信息的传输更为有效和可靠。在二进制数字调制中，当正弦载波的相位随二进制数字基带信号离散变化时，则产生二进制移相键控(2PSK)信号。因为在调制过程中，2PSK调制容易出向工作问题，,2DPSK，调制系统 Abstract Modern communication systems require communication distance, large capacity, good transmission quality of communication. As one of the key technologies of modulation technology has always been one of the important research direction to people. From the earliest fulfillment of analog modulation frequency modulation technology, the digital modulation technique is widely used now, makes the information transmission is more effective and reliable. In binary digital modulation, when sinusoidal carrier phase change with discrete binary digital baseband signal, are produced by the binary phase shift keying (2 PSK) signal. Because in the process of modulation, 2 PSK modulation is prone to reverse the work problem, affect the 2 PSK signal long distance transmission. To overcome this drawback, and maintain the advantages of 2 PSK signal will be 2 PSK system improvement for binary differential phase shift keying system. Baseband signal of binary phase shift keying is said by changes in the adjacent two yards yuan phase, it and carrier phase has no direct relation, so in actual equipment, binary phase shift keying has been widely used. Paper introduces the relative phase shift keying signal modulation principle, and establish related model for simulating the signal modulation and simulation. Analyzing the splitters,modulation, and poor signal source, add noise module functions, with differential coherent and polarity comparison, finally has carried on the debugging to signal. After debugging, the signal source and the samp