<li id="ussk8"></li> Carrier-phase synchronization can be approached in a general manner by estimating the multiplicative distortion (MD) to which a baseband received signal in an RF or coherent optical transmission system is subjected. This paper presents a unified modeling and estimation of the MD in finite-alphabet digital communication systems. A simple form of MD is the camer phase exp GO) which has to be estimated and compensated for in a coherent receiver. A more general case with fading must, however, allow for amplitude as well as phase variations of the MD. We assume a state-variable model for the MD and generally obtain a nonlinear estimation problem with additional randomly-varying system parameters such as received signal power, frequency offset, and Doppler spread. An extended Kalman filter is then applied as a near-optimal solution to the adaptive MD and channel parameter estimation problem. Examples are given to show the use and some advantages of this scheme.
標簽： synchronization Carrier-phase multiplicativ approached
上傳時間： 2013-11-28
上傳用戶：windwolf2000
古典密碼中，主要的思想為移位算法及置換算法。 1.移位密碼 密鑰K為整數，且取值空間為0到25；加密函數：x = x + k (mod 26)；解密函數：x = x - k (mod 26)。當K=3時，為凱撒密碼。 2.仿射密碼 密鑰對由a、b組成，整數a滿足 gcd(a, 26) = 1，整數b的取值空間為0到25；加密函數：x = ax + b(mod 26)；解密函數：x = a*y - a*b (mod 26)。當a=1,b=3時，為凱撒密碼。 3.維吉尼亞密碼 首先確定密鑰長度（本例中密鑰只采取個位數字，所以取決于輸入密鑰的長度），然后輸入滿足這個長度的向量；加密：取明文第一個字母并將之移k1位，這里k1=1,第二個字母移k2位，k2=2,一旦到了密鑰末尾，又從頭開始。 4.換位密碼 首先確定密鑰長度，輸入長度為5的0到4的整數序列，將明文分成每5個字母一組，每組字母按照密鑰進行換位。
標簽： 密碼
上傳時間： 2016-02-09
上傳用戶：jqy_china
編程題（15_01.c） 結構 struct student { long num char name[20] int score struct student *next } 鏈表練習： (1).編寫函數struct student * creat(int n),創建一個按學號升序排列的新鏈表,每個鏈表中的結點中 的學號、成績由鍵盤輸入，一共n個節點。 (2).編寫函數void print(struct student *head),輸出鏈表，格式每行一個結點，包括學號，姓名,分數。 (3).編寫函數struct student * merge(struct student *a,struct student *b), 將已知的a,b兩個鏈表 按學號升序合并，若學號相同則保留成績高的結點。 (4).編寫函數struct student * del(struct student *a,struct student *b),從a鏈表中刪除b鏈表中有 相同學號的那些結點。 (5).編寫main函數，調用函數creat建立2個鏈表a,b,用print輸出倆個鏈表；調用函數merge升序合并2個 鏈表，并輸出結果；調用函數del實現a-b,并輸出結果。 a: 20304,xxxx,75, 20311,yyyy,89 20303,zzzz,62 20307,aaaa,87 20320,bbbb,79 b： 20302,dddd,65 20301,cccc,99 20311,yyyy,87 20323,kkkk,88 20307,aaaa,92 20322,pppp,83
上傳時間： 2016-04-13
上傳用戶：zxc23456789
％radon transform clear all ％ N=800 n=1:N fs=200 t=n/fs x1=exp(j*2*pi*(5*t+0.5*5*t.^2)) x2=exp(j*2*pi*(5*t+0.5*15*t.^2)) x=x1+x2 ％N=length(x) ％ ambifunb(x ) ％*****************************************RAT naf=ambifunb(x) htl(abs(naf)) ％ [wh,rho,theta]=htl(abs(naf)) colormap([0,0,0]) ％ xlabel( 極半徑 ) ％ ylabel( 角度 ) ％**************************************％找出峰值點的坐標,計算初始頻率和調頻斜率(正確) ％找出峰值點的坐標 b=max(max(wh)) [u,a]=find(wh>=0.8*b)
上傳時間： 2014-10-27
上傳用戶：Yukiseop
一元稀疏多項式計算器的基本功能是： (1)輸入并建立多項式； (2)輸出多項式，輸出形式為整數序列：n,c1,e1,c2,e2,….,cn,en, 其中n是多項式的項數，ci和ei分別是第I項的系數和指數，序列按照指數降序排列； （3）多項式a和b相加，建立多項式a+b （4）多項式a和b相減，建立多項式a-b.
上傳時間： 2016-10-25
上傳用戶：時代電子小智
The "GEE! It s Simple" package illustrates Gaussian elimination with partial pivoting, which produces a factorization of P*A into the product L*U where P is a permutation matrix, and L and U are lower and upper triangular, respectively. The functions in this package are accurate, but they are far slower than their MATLAB equivalents (x=A\b, [L,U,p]=lu(A), and so on). They are presented here merely to illustrate and educate. "Real" production code should use backslash and lu, not this package.
標簽： illustrates elimination Gaussian pivoting
上傳時間： 2016-11-09
上傳用戶：wang5829
The "GEE! It s Simple" package illustrates Gaussian elimination with partial pivoting, which produces a factorization of P*A into the product L*U where P is a permutation matrix, and L and U are lower and upper triangular, respectively. The functions in this package are accurate, but they are far slower than their MATLAB equivalents (x=A\b, [L,U,p]=lu(A), and so on). They are presented here merely to illustrate and educate. "Real" production code should use backslash and lu, not this package.
標簽： illustrates elimination Gaussian pivoting
上傳時間： 2014-01-21
上傳用戶：lxm
This approach addresses two difficulties simultaneously: 1) the range limitation of mobile robot sensors and 2) the difficulty of detecting buildings in monocular aerial images. With the suggested method building outlines can be detected faster than the mobile robot can explore the area by itself, giving the robot an ability to “see” around corners. At the same time, the approach can compensate for the absence of elevation data in segmentation of aerial images. Our experiments demonstrate that ground-level semantic information (wall estimates) allows to focus the segmentation of the aerial image to find buildings and produce a ground-level semantic map that covers a larger area than can be built using the onboard sensors.
標簽： simultaneously difficulties limitation addresses
上傳時間： 2014-06-11
上傳用戶：waitingfy
實現一位加法器的設計，假設輸入參數為A,B，則輸出為A,B的和
標簽： 加法器
上傳時間： 2017-01-02
上傳用戶：baiom
VxWorks 6.6 BSP開發執導 This document describes, in general terms, the elements that make up a board support package [BSP], the requirements for a VxWorks BSP, and the general behavior of a BSP during the boot process. This document outlines the steps needed to port an existing BSP to a new hardware platform or to write a new VxWorks BSP for custom hardware using a reference BSP or template BSP as a starting point. It provides hints and tips for debugging a BSP and solving common BSP development problems. It also provides information on the BSP validation test suite [BSP VTS] that is used to assess the functionality of a VxWorks BSP.
標簽： describes document elements VxWorks
上傳時間： 2017-03-23
上傳用戶：磊子226
