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Description: 由于使用了大量数目的子载波，这就使得多载波系统对多种同步误差都很敏
感。同步误差可分为两大类:载波相位
-due to the use of the large number of subcarriers, which makes multi-carrier systems for a variety of synchronization errors are very sensitive. Synchronization error can be divided into two categories : carrier phase
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Size: 10240 |
Author: 张开 |
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Description: 正交频分复用系统(OFDM)的频率偏移误差抑制技术仿真程序-orthogonal frequency division multiplexing (OFDM) the frequency offset error suppression simulation program
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Size: 9216 |
Author: wangbo |
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Description: Tdscdma系统中的载频估计程序，利用导频段，极大似然的估计算法，在MATLAB中的实现程序-Tdscdma system of carrier frequency estimation procedures, the use of derivative band, the maximum likelihood estimation algorithm, MATLAB in the realization process
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Size: 2048 |
Author: 青青 |
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Description: We address the problem of blind carrier frequency-offset (CFO) estimation in quadrature amplitude modulation,
phase-shift keying, and pulse amplitude modulation
communications systems.We study the performance of a standard
CFO estimate, which consists of first raising the received signal to
the Mth power, where M is an integer depending on the type and
size of the symbol constellation, and then applying the nonlinear
least squares (NLLS) estimation approach. At low signal-to noise
ratio (SNR), the NLLS method fails to provide an accurate CFO
estimate because of the presence of outliers. In this letter, we derive
an approximate closed-form expression for the outlier probability.
This enables us to predict the mean-square error (MSE) on CFO
estimation for all SNR values. For a given SNR, the new results
also give insight into the minimum number of samples required in
the CFO estimation procedure, in order to ensure that the MSE
on estimation is not significantly affected by the outliers.
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Size: 1265664 |
Author: 吴大亨 |
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Description: 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.
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Size: 827392 |
Author: 吴大亨 |
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Description: This paper investigates the design of joint frequency
offset and carrier phase estimation of a multi-frequency time division
multiple access (MF-TDMA) demodulator that is applied to
a digital video broadcasting—return channel system via satellite
(DVB-RCS). The proposed joint estimation algorithm is based on
the interpolation technique for two correlation values in the frequency
and phase domains. This simple interpolation technique
can significantly improve frequency and phase resolution capabilities
of the proposed technique without increasing the number of
the correlation values. In addition, the overall block diagram of a
digital communications receiver for DVB-RCS is presented, which
was designed using the proposed estimation algorithms.
Index Terms—Carrier phase estimation, DVB-RCS, frequency
offset estimation, interpolation, joint estimation, MF-TDMA.-This paper investigates the design of joint frequencyoffset and carrier phase estimation of a multi-frequency time divisionmultiple access (MF-TDMA) demodulator that is applied toa digital video broadcasting-return channel system via satellite (DVB-RCS). The proposed joint estimation algorithm is based onthe interpolation technique for two correlation values in the frequencyand phase domains. This simple interpolation techniquecan significantly improve frequency and phase resolution capabilitiesof the proposed technique without increasing the number ofthe correlation values. In addition, the overall block diagram of adigital communications receiver for DVB-RCS is presented, whichwas designed using the proposed estimation algorithms.Index Terms-Carrier phase estimation, DVB-RCS, frequencyoffset estimation, interpolation, joint estimation, MF-TDMA.
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Size: 500736 |
Author: 吴大亨 |
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Description: OFDM系统中的载波频偏估计算法及其性能分析,OFDM 系统中训练序列辅助的载波频偏估计算法及其性能-OFDM system carrier frequency offset estimation algorithm and its performance analysis, OFDM systems training sequence-assisted carrier frequency offset estimation algorithm and its performance
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Size: 1760256 |
Author: 李继龙 |
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Description: 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-In the DAB system frequency synchronization, carrier frequency synchronization, refer to Carrier frequency offset estimation of DAB receiver based on phase reference symbol
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Size: 210944 |
Author: Aries |
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Description: The implementation of estimation and correction of carrier frequency offset of COFDM system in DAB receiver IC ASIC03
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Size: 186368 |
Author: Aries |
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Description: A New OFDM Synchronization Symbol for Carrier Frequency Offset Estimation.一个新的OFDM载波符号同步论文。-A New OFDM Synchronization Symbol for Carrier Frequency Offset Estimation. A new carrier OFDM Symbol Synchronization thesis.
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Size: 324608 |
Author: 梁君 |
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Description: 本文首先概述了OFDM 的原理、特征和关键技术，介绍了系统需要的几种同步。然后就同步误差对系统性能的影响进行了简单的分析，表明定时偏差和采样频率偏差将会引入码间干扰，载波频率偏差导致载波间干扰的发生。因此，在OFDM系统接收机中定时的确定、载波频率偏差和采样频率偏差的纠正是信号恢复的关键。之后对OFDM系统同步的几种实现方法进行了介绍，分析了各同步方法的性能。-The paper first outlines the principles of OFDM, features and key technologies, the system needs to introduce several synchronization. Synchronization error and then the impact on system performance for a simple analysis, show that the timing deviation and the sampling frequency deviation will introduce inter-symbol interference, the carrier frequency deviation led to the occurrence of ICI. Therefore, in OFDM system receiver to determine the timing, carrier frequency offset and sampling frequency offset correction signal to restore the key. After the OFDM system to achieve synchronization of several methods of introduction, an analysis of the performance of the synchronization method.
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Size: 268288 |
Author: dajinyu |
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Description: ML estimation of time and frequency offset in OFDM systems
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Size: 912384 |
Author: roger |
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Description: ofdm的盲同步，很好的文章，需要的就看看吧-OFDM Blind Carrier Offset Estimation ESPRIT
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Size: 439296 |
Author: GeneralLee |
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Description: QPSK开环载波同步技术研究 频偏估计算法-Open-loop carrier synchronization QPSK Research Frequency Offset Estimation Algorithm
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Size: 1024 |
Author: wenweigao |
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Description: This file contains a matlab file for blind carrier estimation which compute the phase and frequency offset of carrier due to Doppler shift.
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Size: 1024 |
Author: Abbas |
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Description: Script for performance measurements for Carrier and Sampling Frequency
Offset Correction in OFDM Systems
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Size: 1024 |
Author: Ali |
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Description: T/2 -spaced FSE MMSE equalizer sim
chnnel: carrier offset-T/2-spaced FSE MMSE equalizer sim
chnnel: carrier offset
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Size: 1024 |
Author: Kai |
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Description: Joint maximum likelihood (ML)symbol-time and carrier-frequency offset estimator in orthogonal frequency-division multiplexing(OFDM) systems.-Joint maximum likelihood (ML)symbol-time and carrier-frequency offset estimator in orthogonal frequency-division multiplexing(OFDM) systems.
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Size: 136192 |
Author: jenna |
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Description: 在C++平台上实现QPSK调制，加频偏过AWGN信道，然后采用COSTAS的方法进行载波恢复-In the C++ platform for a QPSK modulation, plus offset over AWGN channel, and then use the methods COSTAS carrier recovery
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Size: 517120 |
Author: wwyy |
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Description: This an article with an algoritmn about two types of radio-frequency front-end imperfections, that is, carrier frequency offset and the inphase/quadrature (I/Q) imbalance
are considered for orthogonal frequency divisionmultiplexing (OFDM) communication systems-This is an article with an algoritmn about two types of radio-frequency front-end imperfections, that is, carrier frequency offset and the inphase/quadrature (I/Q) imbalance
are considered for orthogonal frequency divisionmultiplexing (OFDM) communication systems
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Size: 932864 |
Author: Kingfoo |
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