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.
标签： synchronization Carrier-phase multiplicativ approached
上传时间： 2013-11-28
上传用户：windwolf2000
在DAB系统中的频率同步，载频同步，参考一下Carrier frequency offset estimation of DAB receiver based on phase reference symbol
上传时间： 2014-11-23
上传用户：songrui
Using LabVIEW 8.5 Language to control Tektronix AWG520. This program can select gain, sample rate, frequency and offset.
标签： Tektronix Language LabVIEW control
上传时间： 2013-11-25
上传用户：invtnewer
This program is used to measure the temperature sensor on an F330 device. It uses 1-point calibration and stores the offset value in FLASH memory. The program outputs temperature values in 100ths of a degree Celsius with UART.
标签： temperature calibrati program measure
上传时间： 2014-01-19
上传用户：啊飒飒大师的
This is GPS in matlab calculatePseudoranges finds relative pseudoranges for all satellites listed in CHANNELLIST at the specified millisecond of the processed signal. The pseudoranges contain unknown receiver clock offset. It can be found by the least squares position search procedure.
标签： calculatePseudoranges pseudoranges satellites relative
上传时间： 2017-03-09
上传用户：时代电子小智
The double-density DWT is an improvement upon the critically sampled DWT with important additional properties: (1) It employs one scaling function and two distinct wavelets, which are designed to be offset from one another by one half, (2) The double-density DWT is overcomplete by a factor of two, and (3) It is nearly shift-invariant. In two dimensions, this transform outperforms the standard DWT in terms of denoising however, there is room for improvement because not all of the wavelets are directional. That is, although the double-density DWT utilizes more wavelets, some lack a dominant spatial orientation, which prevents them from being able to isolate those directions.
标签： double-density improvement additional critically
上传时间： 2017-04-02
上传用户：dongbaobao
DATAS SEGMENT w dw 0 keybuf db 255 db 0 db 255 dup(0) ;定义键盘输入需要的缓冲区 DATAS ENDS STACKS SEGMENT db 200 dup(?) STACKS ENDS CODES SEGMENT ASSUME CS:CODES,DS:DATAS,SS:STACKS START: MOV AX,DATAS MOV DS,AX mov dx,offset keybuf ;用0a号功能，输入一个字符串 mov ah,0ah ;用回车结束 int 21h mov dl,0ah ;再进行换行，以便在下一行显示转换后的字符串 mov ah,2 int 21h ; push ax ; push dx ; mov dl,cl ; mov ah,02 ; int 21h ; pop dx ; pop ax mov bx,offset keybuf+1 ;取出字符串的字符个数，作为循环的次数 mov cl,[bx] mov ch,0 mov ax,0 again: inc bx mov ax,[w] push bx mov bx,16 mul bx pop bx ;是小写字母，则转换为大写字母 mov [w],ax mov dl,[bx] ;取出一个字符， cmp dl,'9' jbe lab1 cmp dl,'F' jbe lab2 sub dl,32 lab2: sub dl ,07h lab1: sub dl,30h add [w],dx loop again mov ax,[w] mov bx,-1 push bx mov bx,10 lab3 :mov dx,0 div bx push dx cmp ax,0 jnz lab3 lab5: pop dx cmp dx,-1 jz lab4 add dl,30h mov ah,02 int 21h jmp lab5 ;循环，处理完整个字符串 lab4: MOV AH,4CH INT 21H CODES ENDS END START
标签： 汇编
上传时间： 2015-04-02
上传用户：wcc0310
We show in the context of a new economic geography model that when labor is heterogenous trade liberalization may lead to industrial agglomeration and inter-regional trade. Labor heterogeneity gives local monopoly power to firms but also introduces variations in the quality of the job match. Matches are likely to be better when there are more firms and workers in the local market, giving rise to an agglomeration force which can offset the forces against, trade costs and the erosion of monopoly power. We derive analytically a robust agglomeration equilibrium and illustrate its properties with numerical simulations
标签： 经济、城市化和经济增长
上传时间： 2016-04-02
上传用户：kinda233
High-Speed, Low-Power Dual Operational Amplifier The AD826 features high output current drive capability of 50 mA min per amp, and is able to drive unlimited capacitive loads. With a low power supply current of 15 mA max for both amplifiers, the AD826 is a true general purpose operational amplifier. The AD826 is ideal for power sensitive applications such as video cameras and portable instrumentation. The AD826 can operate from a single +5 V supply, while still achieving 25 MHz of band width. Furthermore the AD826 is fully specified from a single +5 V to ±15 V power supplies. The AD826 excels as an ADC/DAC buffer or active filter in data acquisition systems and achieves a settling time of 70 ns to 0.01%, with a low input offset voltage of 2 mV max. The AD826 is available in small 8-lead plastic mini-DIP and SO packages.
上传时间： 2020-04-19
上传用户：su1254
ABSTRACTThe flyback power stage is a popular choice for single and multiple output dc-to-dc converters at powerlevels of 150 Watts or less. Without the output inductor required in buck derived topologies, such as theforward or push-pull converter, the component count and cost are reduced. This application note will reviewthe design procedure for the power stage and control electronics of a flyback converter. In these isolatedconverters, the error signal from the secondary still needs to cross the isolation boundary to achieveregulation. By using the UC3965 Precision Reference with Low offset Error Amplifier on the secondaryside to drive an optocoupler and the UCC3809 Economy Primary Side Controller on the primary side, asimple and low cost 50 Watt isolated power supply is realized.
标签： 隔离
上传时间： 2021-11-24
上传用户：kingwide
