Description: 基于二阶或更高阶统计方法的MIMO系统频域盲辨识-Based on second-order or more higher-order statistics method of frequency domain blind MIMO system identification Platform: |
Size: 342016 |
Author:王丽 |
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Description: Single Carrier FDMA又称SC-FDMA或者DFT-Spread-OFDM是3GPP LTE最新提出的适用于上行传输的一种新方案。相对于OFDMA（主要用于下行），其最大的优势在于低峰值平均功率比（即PAPR）。本程序包括OFDMA，SC-FDE（单载波频域均衡）以及SC-FDMA程序，接收端采用经典的ZF和MMSE检测算法，程序短小精悍，相当经典，方便该领域的人学习与研究。-Single Carrier FDMA or SC-FDMA, also known as DFT-Spread-OFDM is the latest 3GPP LTE uplink transmission for a new program. Compared to OFDMA (mainly used for the downlink), the biggest advantage lies in its low peak-average power ratio (ie, PAPR). This procedure, including OFDMA, SC-FDE (single carrier frequency domain equalization), as well as SC-FDMA procedure, the receiving end the use of classical ZF and MMSE detection algorithm, procedures dapper, very classic, convenient in the field to learn and research. Platform: |
Size: 50176 |
Author:程鹏 |
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Description: 在基于脉冲的UWB系统中，采用瑞克接收机合并多径信号能量并进行相干检测，信道估计问题即估计多径信号的到达时间和幅度。在基于OFDM的UWB系统中，接收机根据信道频域响应对每个子信道进行频域均衡后进行相干检测，信道估计问题即估计信道频域响应。-Pulse-based UWB systems, rake receivers using the combined multipath signal energy and coherent detection, channel estimation problem that is estimated multipath signal arrival time and amplitude. OFDM-based UWB system, the receiver under the channel frequency response of each subchannel to frequency domain equalization after coherent detection, channel estimation problem that is estimated channel frequency response. Platform: |
Size: 2048 |
Author:王洁 |
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Description: OFDM系统完美仿真绝对可用包含星座图，时域频域仿真及传输函数-OFDM system is absolutely perfect simulation can include constellation, time domain simulation and frequency domain transfer function Platform: |
Size: 5120 |
Author:cz |
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Description: 此文件为ofdm的matlab仿真程序，详细画出了时域和频域的相关图，以及调制信号的实虚部。-This file is the matlab ofdm simulation program, detailed drawing of the time domain and frequency domain correlation diagram, and the modulation signal real and imaginary parts. Platform: |
Size: 1024 |
Author:小武子 |
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Description: In this paper, we investigate the timing and carrier
frequency offset (CFO) synchronization problem in decode and
forward cooperative systems operating over frequency selective
channels. A training sequence which consists of one orthogonal
frequency-division multiplexing (OFDM) block having a tile
structure in the frequency domain is proposed to perform synchronization.
Timing offsets are estimated using correlation-type
algorithms. By inserting some null subcarriers in the proposed tile
structure, we propose a computationally efficient subspace decomposition-
based algorithm for CFO estimation. The issue of optimal
tile length is studied both theoretically and through simulations.
By judiciously designing the tile size of the pilot, the proposed
algorithms are shown to have better performance, in terms of
synchronization errors and bit error rate, than the time-division
multiplexing-based training method and the computationally demanding
space-alternating generalized expectation-maximization Platform: |
Size: 728064 |
Author:ashish |
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Description: matlab发送端程序,256位FFT,16QAM-OFDM，最后有时域和频域图形显示-matlab sender program, 256 FFT, 16QAM-OFDM, the last times and frequency domain graphics Platform: |
Size: 92160 |
Author:王猛 |
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Description: 正交频分复用(OFDM)是第四代移动通信的核心技术,它是实现宽带无线通信和多媒 体业务发展的基础。对OFDM 技术的基本原理，关键技术以及实现进行了研究，并且通过 matlab 中的通信仿真系统simulink 对OFDM 系统进行了模拟和分析，直观和形象地得到了 OFDM 系统在时域和频域的传输性能，得出的结果表明OFDM 系统可以明显地表现出抗多 径效应引起的频率选择性衰落和提高了频谱利用率，这一特性使得它能够在高数据传输速率 的无线信道中发挥优势。-Orthogonal Frequency Division Multiplexing (OFDM) is the fourth generation mobile communication core technology, which is broadband wireless communications and multimedia development. The basic principle of OFDM technology, key technology and implementation have been studied, and by matlab simulink simulation system in the OFDM communication system was simulated and analyzed, intuitive, and get the image of the OFDM system in time domain and frequency-domain transmission performance , the results show that OFDM system can be apparent in the anti-multipath effect caused by frequency selective fading and improve the spectrum efficiency, this allows it to transmit at high data rate wireless channel advantage. Platform: |
Size: 258048 |
Author:foxlili |
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Description: 介绍了OFDM 技术的基本原理及其系统实现，以其关键技术之一：信道估计为侧重点介绍了信道估计的算法原理，介绍了一种以两次一维估计（时域和频域）代替时频二维信道联合估计的算法，并给出了该算法的Matlab 仿真实现。-Describes the basic principles of OFDM technology and system implementation, one of its key technologies: the channel is estimated to focus introduces the principle channel estimation algorithm, introduced a one-dimensional to two estimates (time domain and frequency domain) instead of joint time-frequency two-dimensional channel estimation algorithm, and gives the Matlab simulation of the algorithm implementation. Platform: |
Size: 239616 |
Author:foxlili |
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Description: 针对无线电监测和认知无线电系统中正交频分复用(OFDM) 信号参数估计这一重要问题,提出了用频域累积法算OFDM 信号的循环自相关函数的数值计算方法.-For radio monitoring and cognitive radio systems, orthogonal frequency division multiplexing (OFDM) signal parameter estimation of this important issue, the accumulation method to count cycle of the OFDM signal in frequency domain autocorrelation function of the numerical method. Platform: |
Size: 151552 |
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 Platform: |
Size: 858112 |
Author:Chaos |
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Description: 用MATLAB对OFDM进行仿真，做ofdm仿真很简单，产生一个序列，用ifft转换到时域，加上噪声，再用fft转换到频域，比较下，计算误码-OFDM simulation using MATLAB, do ofdm simulation is very simple to generate a sequence, use ifft into the time domain, plus noise and then converted to the frequency domain fft A comparison of computing error Platform: |
Size: 3072 |
Author:何裴 |
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Description: 根据OFDM的时频特性,提出了一种新的空间测距方法.首先在时域对OFDM信号进行相关处
理,得到距离的粗估计,在粗估计的基础上,利用OFDM不同子载波数据之间的相位差,得到距离的精
确估计,根据精确估计的结果对粗估计的结果进行校正,从而得到最终的距离估计值.仿真结果表明,该
方法的测距精度比采用延迟锁定环的伪码测距方法至少提高了4倍,并且在信噪比大于20 dB时,可以
达到厘米级.
-According to the properties of OFDM in the time and frequency domains, a novel ranging
method in space is proposed. The coarse estimation of range can be obtained from the correlation of the
waveforms of OFDM signals in the time domain, and the fine estimation is obtained from the phase
differences between the sub-carriers in the frequency domain. The fine estimation is then adopted to
correct the coarse estimation, and the final estimation of range is achieved. Simulation results show that
the ranging accuracy of the proposed method is more than 4 times better than that of pseudo-code
ranging. Furthermore, the ranging accuracy is close to the centimeter level when the signal-to-noise ratio
is beyond 20 dB.
Platform: |
Size: 56320 |
Author:wangmingxiao |
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Description: 首先根据短训练字的特性进行相关运算，进行信号到达检测，当检测到相关值大于门限一定次数后，认为有信号到达。然后根据长训练字的特性，进行相关运算，进行OFDM符号FFT窗口起始位置的估计。估计出FFT窗口的位置后，先在时域进行小频偏的估计，将两个长训练字进行小频偏补偿后，进行FFT运算，根据FFT运算的结果进行整数倍频偏的估计。这些参数估计完成后，就可以进行数据解调了。先对数据部分进行完整的频偏补偿，然后根据估计的FFT窗口位置进行FFT运算得到频域的数据，进行解调。然后在对应于导频的子载波位置上提取出导频信息，根据导频信息估计出剩余定时误差以及剩余的信道响应误差，将误差量送入环路进行跟踪。当收到所有数据后，重新回到信号到达检测状态，进行下一次信号到达的检测和信号接收。-First of all, according to the characteristics of the short training word correlation calculation of the signal reaching the detector, when the detected correlation value is greater than the threshold of a certain frequency and that a signal arrives. Then, the correlation calculation according to the characteristics of the long training word, the initial estimate of the location of the OFDM symbol FFT window. The estimated position of the FFT window, the first small frequency offset estimation in the time domain, the small frequency offset compensation, the two long training word FFT operation integer frequency offset estimate, according to the result of the FFT operation. After the completion of these parameter estimates, data demodulation. The complete frequency offset compensation, and then based on the estimated FFT window position for the FFT operation to obtain a frequency domain data, demodulates the first data part. Then in a position corresponding to the pilot subcarriers extr Platform: |
Size: 124928 |
Author:章田 |
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Description: 实现了光OFDM模块的各个功能，同时仿真分析了OFDM的载波幅度谱、相位谱、每个载波对应的时域信号、整个时域/频域的OFDM、每个接收符号的分布图。计算了相位差-To achieve the various functions of the optical OFDM module, the simulation analysis of the the the OFDM carrier amplitude spectrum and phase spectrum, and the time domain signal corresponding to each carrier, the whole time domain/frequency domain OFDM, each reception symbol maps. Calculated phase difference Platform: |
Size: 3072 |
Author:丁丁 |
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Description: Based on the principle of OFDM system, the paper mainly includes the following aspects: the development of mobile communications, the characteristics of the radio channel, OFDM system theory, the advantages and disadvantages, key technologies, and adaptive technology of the OFDM technologies.Next, the OFDM symbol function, time domain and frequency domain model is analyzed detailed by some basic knowledge, some basic knowledge of Convex optimization problem.-Based on the principle of OFDM system, the paper mainly includes the following aspects: the development of mobile communications, the characteristics of the radio channel, OFDM system theory, the advantages and disadvantages, key technologies, and adaptive technology of the OFDM technologies.Next, the OFDM symbol function, time domain and frequency domain model is analyzed detailed by some basic knowledge, some basic knowledge of Convex optimization problem. Platform: |
Size: 64512 |
Author:znp |
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Description: 首先根据短训练字的特性进行相关运算，进行信号到达检测，当检测到相关值大于门限一定次数后，认为有信号到达。然后根据长训练字的特性，进行相关运算，进行OFDM符号FFT窗口起始位置的估计。估计出FFT窗口的位置后，先在时域进行小频偏的估计，将两个长训练字进行小频偏补偿后，进行FFT运算，根据FFT运算的结果进行整数倍频偏的估计。这些参数估计完成后，就可以进行数据解调了。先对数据部分进行完整的频偏补偿，然后根据估计的FFT窗口位置进行FFT运算得到频域的数据，进行解调。然后在对应于导频的子载波位置上提取出导频信息，根据导频信息估计出剩余定时误差以及剩余的信道响应误差，将误差量送入环路进行跟踪。当收到所有数据后，重新回到信号到达检测状态，进行下一次信号到达的检测和信号接收。-First, according to the characteristics of the short training word correlation operation, the signal reaching the detector, when the detected correlation value is greater than the threshold after a certain number of times that a signal arrives. And then the characteristics of long training word, the correlation operation for the FFT window starting position of an OFDM symbol estimate. The estimated position of the FFT window, the first small frequency offset in the time domain estimation, the two long training word small frequency offset compensation, the FFT operation, the FFT result of the operation for integer frequency offset estimate. These parameter estimation is completed, the data can be demodulated on. The first portion of the data for a complete frequency offset compensation, and based on the estimated FFT window position of the FFT operation to obtain frequency domain data, demodulated. Then corresponding to the position of the pilot subcarriers are extracted on pilot inform Platform: |
Size: 11264 |
Author:wangkai |
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Search - ofdm frequency domain