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Description: alamouti 空频分组码---在时变信道下SFBC-OFDM-alamouti space-frequency block codes- in the time-varying channels under the SFBC-OFDM
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Size: 516096 |
Author: 冯敖 |
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Description: A CODED OFDM SYSTEM FOR TIME-VARYING MULTIPATH
RAYLEIGH FADING ENVIRONMENT
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Size: 416768 |
Author: Ikram |
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Description: 这个程序除了接收机同步、信道编码没有加入外，基本上反映了一个OFDM系统的特性：
1. qpsk/16qam/64qam映射、解映射
2. OFDM调制解调（循环前缀，FFT等）
3. 非整数采样时刻多径时延的多径信道
4. Rayleigh或者Rician多径信道
5. 信道的连续时变（非block fading）
6. 线性插值信道估计
7. FFT变换域插值信道估计-In addition to this program receiver synchronization, channel coding have not joined, the basically reflect the characteristics of an OFDM system: 1. Qpsk/16qam/64qam mapping, mapping solution 2. OFDM modulation and demodulation (cyclic prefix, FFT, etc.) 3. Non- integer sampling instant multi-path delay of multi-path channel 4. Rayleigh or Rician multipath channel 5. a continuous time-varying channel (non-block fading) 6. linear interpolation channel estimation 7. FFT transform domain interpolation channel estimation
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Size: 1024 |
Author: 施炯 |
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Description: 信道均衡技术是移动通信中抗衰落的三大技术之一。均衡是用来解决由于信道的非线性和时变性引起的码间干扰的有效技术。如何有效解决码间干扰问题，具有重要的理论意义。 本文在介绍自适应均衡技术的基本原理和均衡研究现状的基础上，阐述了目前几种典型的自适应均衡算法及其它们存在的一些问题。文章在传统自适应算法的基础上，提出了两种改进算法：基于RLS的自适应MIMO-DFE算法和基于分数间隔的改进CMA+SDD算法。计算机仿真结果表明，两种算法的收敛速度快，稳态误差小，均衡效果与传统算法相比都取得了明显提高。-Channel equalization in mobile communications technology is the anti-fading of the three technologies. Balance is used to solve due to channel non-linear and time-varying inter-symbol interference caused by effective techniques. How to effectively solve the inter-symbol interference problem, has important theoretical significance. This paper introduces the basic principle of adaptive equalization and balanced study of the status quo, based on the current set of several typical adaptive equalization algorithm and some of the problems of their existence. Article in the traditional adaptive algorithm based on the proposed two improved algorithms: RLS-based adaptive MIMO-DFE algorithms and interval-based scores improved CMA+ SDD algorithm. Computer simulation results show that the two kinds of convergence of the algorithm fast, steady-state error is small, compared to equilibrium results with the traditional algorithms have achieved significantly improved.
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Size: 43012096 |
Author: 阿郎 |
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Description: CHANNEL ESTIMATION TECHNIQUES FOR
OFDM SYSTEMS IN DISPERSIVE
TIME-VARYING CHANNELS
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Size: 441344 |
Author: Thomas |
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Description: 对ofdm系统进行信道估计，特别是对时变信道，受多径和多普勒影响严重的系统，算法收敛性很好-Ofdm system for channel estimation, especially for time-varying channel, affected by severe multipath and Doppler system is very good convergence
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Size: 303104 |
Author: 施政 |
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Description: A Rate-one Full-diversity Low-complexity
Space-Time-Frequency Block Code (STFBC) for
4-Tx MIMO-OFDM
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Size: 154624 |
Author: Bhasker gupta |
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Description: Designing spectral e±cient, high-speed wireless links that o® er high quality-
of-service and range capability has been a critical research and engineering chal-
lenge. In this thesis, we mainly address the complexity and performance issues of
channel estimation and data detection in multiple-input multiple-output (MIMO)
orthogonal frequency division multiplexing (OFDM) systems over time-varying
channels.
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Size: 493568 |
Author: ashish |
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Description: 给出了OFDM在卫星通信中的系统框图并
在Simulink中仿真实现，利用改进的CMA恒模算法进行盲均衡处理，来去除时变卫星信道对信号的影响,基于4阶累积量的方法
将OFDM信号与其他调制类型信号区分开来-OFDM is given in the satellite communication system block diagram and Simulation in Simulink using the modified constant modulus algorithm CMA for blind equalization, to remove the time-varying satellite channel on the signals, based on 4-order cumulant method OFDM signals and other types of signal modulation to distinguish
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Size: 3167232 |
Author: 赵亮 |
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Description: 在多径分量数确定的前提下,MIMO-OFDM系统采用传统的基于导频辅助和盲信道估计算法能获得较好性能。实际无线环境中,多径分量数目与幅度都是时变的,则传统信道估计方法不再适用。该文采用随机集理论建模MIMO-OFDM系统信道多径分量数的变化和MIMO信道。基于此模型提出了集中粒子空间重采样方法(CRS),在保留大概率粒子抽样样本的同时主动抛弃小概率抽样样本,以获得更为准确的真实样本逼近。并提出了基于集中重采样Rao-Blackwellised粒子滤波的信道估计方法(RBPFC)。仿真结果表明:所提出的RBPFC方法信道估计性能最好,基本Rao-Blackwellised粒子滤波方法次之但优于基本粒子滤波算法,卡尔曼滤波的信道估计方法性能最差。-The typical pilot-aided and blind estimation method for MIMO-OFDM channel can achieve good performance when the number of multi-path components is constant.However,in the practical wireless environment,the number of channel taps and amplitude are all unknown and time-varying in whole process,thus typical estimation methods are not suitable.In this paper,the channel-taps varying condition and a new channel model are established by using RST theory.Based on this model,the re-sample method by Concentrating pa...
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Size: 610304 |
Author: 王睿 |
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Description: dispersive ofdm channel cir estimation
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Size: 444416 |
Author: kimoskimos |
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Description: 电力线通信在OFDM下不同短时循环短时的信道估计-Cyclic Short-Time Varying Channel estimation in OFDM Power-Line Communication
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Size: 549888 |
Author: 章都 |
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Description: 针对在无线电监测和认知无线电系统中,信号参数估计这一重要问题,证明了OFDM信号具有循环平稳性的必要条件是加循环前缀或有非矩形脉冲成型,并以线性周期时变变换(LPTV)模型为基础,推导了OFDM信号的循环谱表达式-For radio monitoring and cognitive radio systems, signal parameter estimation of this important issue, the necessary condition for the OFDM signal with cyclostationarity is the cyclic prefix increases or non-rectangular pulse shaping, and Linear Periodically Time-varying transform (LPTV) model, based on the cyclic spectrum of the OFDM signal expression is derived
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Size: 273408 |
Author: Chaos |
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Description: 频率同步是宽带OFDM系统中的关键技术，IEEE 802.11a 采用OFDM技术，利用其前导序列的重复结构，提出了一种分步的粗细频偏捕获与校正算法，同时为了补偿时域同步后的残余相差和适应信道的时变特性，还提出了一种基于频域导频的相位跟踪方案-Frequency synchronization is a key technology in the broadband OFDM systems, IEEE 802.11a uses OFDM technology, the use of the repetitive structure of the leader sequence, the thickness of a step frequency offset capture and correction algorithm, when the order to compensate at the same time domain synchronous residualthe difference between and adapt to the time-varying characteristics of the channel is also proposed based on frequency domain pilot phase tracking scheme
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Size: 858112 |
Author: Chaos |
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Description: mimo_ofdm快速时变的一种低复杂度的检测算法在PDF通道，他涉及MIMO-OFDM的基本知识及应用。-Mimo_ofdm fast time-varying a low complexity detection algorithm in PDF channel, basic knowledge and application he relates to MIMO-OFDM.
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Size: 21390336 |
Author: 高琼 |
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Description: 一种新的符号定时和载波频率同步算法,该算法将OFDM符号分成几部分。它使用相关性和积累在几个OFDM
符号获得估计函数。当部分的长度小于ISI自由地区,该算法可以识别它。然后估计的最优符号定时和载波频率偏移可以获得。计算机仿真结果表明,该算法不仅可以跟踪时变信道变化但也有较小的MSE比ML估计算法。-A new symbol timing and carrier frequency synchronization algorithm is presented and the algorithm divides the OFDM symbol into several parts. It uses correlation and accumulation in several OFDM
symbols to acquire estimation function. When the length of part is smaller than that of ISI free region , the algorithm can distinguish it. Then the estimation of optimal symbol timing and carrier frequency offset can be acquired .The computer simulation results show that the proposed algorithm not only can track time varying channel change but also has smaller MSE than that of ML
estimation algorithm.
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Size: 276480 |
Author: wujueying |
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Description: 一种新的基于粒子滤波的OFDM时变信道估计方法-A new particle filter based OFDM time-varying channel estimation method
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Size: 1699840 |
Author: 刘久 |
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Description: acoustic ofdm matlab code with pdf
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Size: 281600 |
Author: ashu |
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Description: Orthogonal Frequency Division Multiplexing
with Index Modulation,is proposed for operation over frequency-selective and rapidly
time-varying fading channels
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Size: 1408000 |
Author: akumar5189
|
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Description: 快变信道估计设计与实现 oFDM系统的论述；快变信道下OFDM系统仿真设计；快变信道下的OFDM同步；快变信道下OFDM系统的信道估计；完成毕业设计论文。(Discussions on the design and implementation of fast-varying channel estimation; simulation design of OFDM system in fast-varying channel; synchronization of OFDM system in fast-varying channel; channel estimation of OFDM system in fast-varying channel; completion of graduation thesis.)
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Size: 11264 |
Author: leo177 |
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