一、MQAM解调原理 MQAM信号同样可以采用正交相干解调方法,其解调器原理图如图9-4所 示。解调器输入信号与本地恢复的两个正交载波相乘后,经过低通滤波输出两路 多电平基带信号X(t)和Y(t)。多电平判决器对多电平基带信号进行判决和检测, 再经L电平到2电平转换和并/串变换器最终输出二进制数据

4)可以证明:厄米算符的本征矢满足完备性条件, ∑|)(l=1 或∫d)(|=1 或∑1+」d1f=1 构成H语ert空间的一组正交归一的基矢。 5.两组基矢之间的变换(表象变换) 正如在3维空间中可选择直角坐标系,也可以选择球坐标系、柱坐标系一样

二乘法 一般的最小二乘逼近(曲线拟合 的最小二乘法)的一般提法是:对 给定的一组数据(x2y)(=0, 要求在函数类0={…,n中找 一个函数y=S(x),使误差平方和 6l2=∑62=∑S(x)-yF=min∑[S(x)-y

3.1晶体管的开关特性 3.2TL集成逻辑门 3.3ECL集成逻辑门与I2L电路 3.4Ms逻辑门 3.5cmos电路

L Matching: (20%) Directions: Read the essay below. The topic sentence of each paragraph is missing. Now look at the topic sentences a, b, c, d and e that followed the essay and match four of them with the paragraph

Name: L Write down the chinese meanings of the following words:( 50%) 1. receipt purp 3. manuf acture 4. marvelous 5. mild

Unit Two Text A l. Pre-reading Task ll. Related\\ Information lll. Outline& Summary IV. Detailed Study V. Home Assignment

L. Introduction 1. Introductory Remarks The pace of scientific and technological progress appears to speed up all the time. New inventions appear and quickly make hundreds of existing devices and procedures out of date. The computer technology is just one of the few most exciting current scientific

Unit Seven Text B l. Pre-reading Task ll. Related Information Ill. Detailed Study IV. Outline& Summary V. Home Assignment

PaRT 1. THE SECOND LAW OF THERMODYNAMICS l.A. Background to the second Law of Thermodynamics AW 23-31(see IAW for detailed VwB&s references); VN Chapters 2, 3, 4 1-A. I Some Properties of engineering Cycles; Work and Efficiency As motivation for the development of the second law, we examine two types of processes that