carrier synchronization造句

• A new carrier synchronization technique for orthogonal frequency division multiplexing system
  正交频分复用系统中新的载波精同步算法
• What ' s more , some improved carrier synchronization algorithms for high order qam signals are described
  最后，讨论了适合高阶qam信号特点的载波同步方法。
• This thesis makes a deep research of digitized carrier synchronization technology and the algorithm ’ s software implementation
  本文对数字化载波同步技术及其算法的软件实现做了深入的探讨与研究。
• In this paper , the design and implementation of the carrier synchronization technology in the integrated anti - interference data transmission system have been investigated
  本文对综合抗干扰数据传输系统的载波同步及实现进行了研究。
• To achieve fast acquisition with only a few symbols , a joint structure for clock and carrier synchronization with non - data aided ( nda ) mode is presented
  摘要为了实现解调中的快速同步，本文给出了一种联合结构下无数据辅助载波同步和符号同步的方法。
• In chapter 4 , the circuit of the carrier synchronization unit is implemented on fpga , the resistor transistor logic ( rtl ) schemes are presented
  第四章在fpga平台上实现载波同步单元电路,并给出了实现后的fpga资源消耗、寄存器传输逻辑( rtl )原理图。
• Finally , the paper gives out a scheme of digitized carrier synchronization loop for software defined radio receiver which is based on the hardware platform composed of fpga and dsp
  最后给出了一种用fpga与dsp组成的硬件平台实现软件无线电接收机载波同步环路的方案。
• We focus on the carrier synchronization method , the circuit and its parameters design , the performance simulation and the circuit implementation in field programmable gate array ( fpga )
  重点研究载波同步方法,设计电路及参数,仿真同步性能,并在现场可编程门阵列( fpga )上实现同步电路。
• Phase - lock part of the system was simulated in system view that is a eda tool , including picking - up carrier synchronization algorithm and designing filter , etc
  系统采用相干解调方法，载波同步采用costas环，在系统开发过程中，利用eda工具systemview对锁相部分包括载波同步算法和数字滤波器设计等内容进行了仿真分析。
• The task of carrier synchronization is tracking the frequency and phase of a carrier wave , the most effective means for tracking small frequency deviation and the phase of a carrier is using the phase - locked loop ( pll )
  载波同步的任务就是跟踪载波的频率和相位,对于载波相位及小频偏的跟踪,最有效的方式是使用锁相环。
• Digitalizing includes modulation mode digitalized and equipment all digitalized . aiming at this characteristic , this thesis research in carrier synchronization and signal demodulation of new generation space tt & c system
  数字化包括调制方式的数字化和设备的全数字化，本文就结合这一特点对新一代航天测控系统中载波同步和信号解调进行了研究。
• In this paper , we emphasis on investigating a difficult view of ofdm , that is synchronization problems , who include frame synchronization , timing synchronization and carrier synchronization , at last we will simulate the whole system
  在这篇文章里，我们重点研究的是ofdm的一个难点- - - -同步问题，其中包括帧同步、定时同步和载波同步，最后对整个系统进行模拟仿真。
• The algorithm of cross product automatic frequency control ( cpafc ) and frequency bin technology is used for tracking larger frequency deviation . the paper gives out a scheme of digitized carrier synchronization loop , in which the digitized costas loop is used as a basic part while cpafc and frequency bin technology as auxiliary
  在此基础上提出了数字化、软件化的载波同步环路算法方案,主要采用数字化科斯塔斯环的形式,并加以自动频率跟踪算法和频率开槽技术的辅助来实现载波同步。
• Take the hoc based blind modulation detection algorithm as an example , the relationship between the blind modulation detection algorithm and synchronization is investigated . an unproved detection algorithm robust to frequency offset is proposed which solves the problem caused by the error in carrier synchronization . how to synchronize a received signal with unknown modulation type is studied and a blind algorithm to estimate symbol timing of the signals with unknown modulation type is presented
  研究了载波同步和码元定时同步与调制方式盲检测算法的关系；以自适应单载波中高阶累积量调制方式盲检测算法为例，对于载波同步误差引起的频偏问题，提出一种基于频偏稳健的mdpsk信号调制方式盲检测算法；对于未知调制方式信号的定时同步问题，提出一种盲定时估计算法，该算法可以估计mdpsk和mqam信号的定时同步信息，实现数字信号的同步分类；提出了一种基于调制方式盲检测的自适应接收机结构，把调制方式盲检测，信噪比估计和同步解调联合起来进行，实现调制方式随信道质量而自适应变化的信号的正确接收。
• Down link channel of new generation space tt & c system generally select qpsk as its modulation mode . firstly , carrier synchronization of qpsk is studied in the thesis , and then the key question - carrier synchronization in low snr and severe doppler frequency shift is systemic analyzed . in addition , different existing project are analyzed and compared
  新一代航天测控系统的下行信道一般选择qpsk作为其信号调制方式，本文首先研究了qpsk的载波同步问题，对其中的关键问题? ?低信噪比及大多普勒频移情况下的载波同步进行了系统的分析，对现有的不同方案进行了分析与比较。
• There are two uncertain factor about it : the phase of the pn code and the doppler - shift . after capturing the received signal successfully , the traditional ds receiver always uses a delay locked loop ( dll ) to synchronize the pn code and then uses a costas loop to realize the carrier synchronization . this complex closed - loop structure not only take long time to realize the synchronization , but also has the defect of “ hang up ”
  传统的扩频接收机通常在捕获伪码信号后利用迟早门鉴相的延时锁定环来实现伪码的精同步,解扩后利用科斯塔斯环实现载波同步,这种闭环结构不仅同步时间长、结构复杂,而且锁相环还存在所谓的“ hang - up ”现象。
• In chapter 1 , the basic principle and structure of the integrated anti - interference data transmission system are introduced . in chapter 2 , the theory of maximum likelihood ( ml ) carrier synchronization parameter estimation ( frequency estimation and phase estimation ) are expatiated , and the closed - loop recovery methods ( phase - locked loop , pll ) and some other arithmetic in common use are introduced
  第二章对最大似然( ml )载波同步参数估计(频率估计和相位估计)理论进行了阐述,对常用的闭环恢复法即锁相环( pll )法和一些载波同步参数处理方法进行了介绍,并对常用的载波频率估计方法作了分析比较。
• The principle and structure of pll ( phase - locked loop ) , including fll and loop filter , are analyzed and described . the module of carrier synchronization in the all - digit ds - qpsk receiver was carried out in the fpga chip . the problem about the estimation and track of the correlative carrier frequency under high dynamic circumstances was resolved very well
  针对某遥测遥控全数字接收机的研制,对相干载波同步中的锁相环、锁频环、 dpll 、本地nco等进行了详细的分析和优化设计,在fpga上实现了高动态全数字ds - qpsk接收机中的载波同步模块,解决了大范围和动态多普勒频移下接收机的相干载波提取与跟踪问题。
• This paper focuses on the technologies involved in blind receiver , such as signal sampling , blind equalization , symbol synchronization and carrier synchronization . a software radio blind receiver implemented on a high speed dsp platform is also introduced . chapter 2 firstly introduces several important specifications of a / d converter
  本文对软件无线电盲接收所涉及的采样、盲均衡、盲符号同步和盲载波同步等技术作了较深入的研究，并提出一些实用有效的实现结构和算法。
• For carrier synchronization , a method of estimating the ofiset of carrier frequency has been presented , which has a more broad range of the estimated oflset of carrier fiequency and more accurate result man other methods , then , a method of estimating the carrier complex phase has been presented , which corrects directly the ofiset of carrier phase
  对于全数字接收机中的载波恢复，先提出了一种估计范围宽、估值精度高的载波频偏估计算法，接着介绍了一种可以直接对载波相位偏差进行补偿的复相位估计方法。