通信工程——多进制调制毕业设计.doc

本 科 毕 业 设 计 (论 文) 毕业设计（论文）中文题目（二号楷体加粗居中） English Title（二号Times New Roman字体加粗居中） 学 院： 电子工程学院 专业班级： 通信 通信051 学生姓名： 吴建俊 学 号： 030512119 指导教师： 董自健（讲师） 年 月 毕业设计（论文）中文摘要 多进制调制性能分析 摘 要：为使数字信号能在带通信道中传输，必须用数字信号对载波进行调制，其调制方式与模拟信号调制相类似。因数字信号对载波参数的调制通常采用数字信号的离散值对载波进行键控，故调制方式可分为幅移键控（ASK）、频移键控（FSK）和相移键控（PSK）。(ASK)、频移键控(FSK)和相移键控(PSK)。它们分别对应于用载波（正弦波）的幅度、频率和相位来传递数字基带信号，可以看成是模拟线性调制和角度调制的特殊情况。 关键词：幅移键控频移键控相移键控正交振幅调制 毕业设计（论文）外文摘要 Performance Analysis of M-ary modulation Abstract: To enable the digital signal can transmit in Band-pass signal channel, digital signal must be modulated on the carrier, the modulation is similar with analog signal modulation. Digital signal on the carrier due to modulation parameters used discrete digital signal value of the carrier for keying, so the mode of modulation can be divided into amplitude shift keying?(ASK), frequency shift keying (FSK) and phase shift keying (PSK). The ultimate goal of communication is transmit information in a certain distance. Although the base-band digital signal can be transmitted directly relatively close to the case of direct transmission, but if meeting the long-distance transmission, especially in the wireless or optical transmission channel, then the signal must be modulated over high-frequency spectrum to the Department in order to transmit in the transmission channel. In order to enable digital signal in a limited bandwidth transmission of high-frequency channels to be carried out on the digital signal modulation. As the same with analog signal transmission, to transmit digital signals there are three basic types of modulation: amplitude shift keying (ASK), frequency shift keying (FSK) and phase shift keying (PSK). They correspond to the carrier (sine wave) the magnitude, frequency and phase separately in order to transmit digital base-band signal which can be regard as a special circumstances of linear modula