码间干扰和码元互相关特性对信号的影响  

Analysis of the impact of intersymbolic interference and symbol cross correlation on characteristics of signals

作　　者：薛伟[1] 郭黎利[1] 张晓林 马卫群 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2010年第1期109-114,共6页Journal of Harbin Engineering University

基　　金：教育部留学回国人员科研启动基金资助项目

摘　　要：提高信号的单位频带利用率和功率利用率是通信领域的重要研究课题之一.提出了一种基于最优化建模来获取该类信号的方法.应用最小频带外能量辐射准则来建立最优化基带码元信号的泛函数模型,并引入傅里叶级数并通过求解该泛函数的最小值可以得到具有频谱快速滚降特性的基带码元信号.在充分考虑码元间互相关特性基础上,通过对泛函数附加恒包络条件限制,使所得信号具有准恒包络的特性.建立了针对该类信号的正交调制及相干解调方案,计算机仿真结果表明,该方法是可行的.Improving the utilization of signal bandwidth and power is one of the most important research topics in the field of communications.A method was proposed,based on an optimized model,using a functional model of the optimized baseband symbol signals created according to the criteria of minimum energy radiation outside active frequency bands.By applying the Fourier series to solve the minimum of that function,baseband symbol signals with fast spectrum roll-off characteristics were found.By minimizing symbolic cross correlation characteristics,and by limiting the functional constant envelope conditions,the signals have quasi-constant envelope characteristics.A quadrature modulation and coherent demodulation scheme was presented and its feasibility was then proven by computer simulations.

关 键 词：傅里叶级数 泛函数 码间干扰 能量谱 

分 类 号：TN911.72[电子电信—通信与信息系统]