一、回答下列问题 (1)平稳随机过程X()的自相关函数为R()。已知对任意,x()和X(t+t)当t→∞时不相关。问x()的平均功率,直流功率,交流功率各为多少?

一.某分组码的最小码距是7,若该码用于纠错,可保证纠正多少位错?若用于检错,可保证检出多少位错?

一、简答题: 1.将模拟基带信号m()=2cos400分别以DSB及SSB下边带方式调制于载波 2cos(2×103元t)上,请画出相应已调信号的幅度频谱(标明频率)

PART填空题 1.某分组码的最小码距是16,该码用于纠错,可保证纠正位错若用于检错,可保证 检出位错

一、简答题 1一数字传输系统以1000符号/秒的码元速率传送16进制码元,求该系统的信息传输速率

PART填空题 1.某分组码的最小码距是6,若该码用于纠错,可保证纠正位错。若用于检错,可保证检出位错

一、简答题: (1)在理想信道下的最佳基带系统中,发送滤波器Gr(),接收滤波器()和系统总的传 输函数H()之间应满足什么关系?

74.1Introduction 74.2 Satellite Applications 74.3 Satellite Functions 74.4 Satellite Orbits and Pointing Angles 74.5 Communications Link 74.6 System Noise Temperature and G/T 74.7 Digital Links 74.8Interference 74.9 Some Particular Orbits 74.10 Access and Modulation Daniel F. DiFonzo

73.1 Signal Detection General Considerations. Detection of Known Signals.Detection of Parametrized Signals. Detection of Random Signals Deciding A mong Multiple Signals. Detection of Signals in More General noise rocessesRobust and Nonparametric Detection Distributed and Sequential Detection. Detection with Continuous-Time Measurements 73.2 Noise Statistics of Noise. Noise Pow owerect of Linear Transformations on Autocorrelation and Power Spectral Density White, Gaussian

72.1 B-ISDN Manfred N.Huber B-ISDN Services and Applications- Asynchronous Transfer Mode.Transmission of B-ISDN Signals.ATM Adaptation Siemens Layer. B-ISDN Signaling J.N.Daigle 72.2 Computer Communication Networks Commun University of Mississippi General Networking Concepts Computer Con ication Network Architecture. Local-Area- Networks and Internetssome Joseph Bannister Additional Recent Developments University of Southern 72.3 Local-Area Networks