Description: 这是一个相对完整的OFDM通信系统的仿真设计，包括编码，调制，IFFT，上下变频，高斯信道建模，FFT，PAPR抑制，各种同步，解调和解码等模块，并统括系统性能的仿真验证了系统设计的可靠性。
-This is a relatively complete simulation of OFDM systems design, including coding, modulation, IFFT, up and down conversion, Gaussian channel model, FFT, PAPR suppression of synchronization, demodulation and decoding modules, and systems, including system performance simulation verifies the reliability of system design. Platform: |
Size: 9216 |
Author: |
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Description: OFDM系统中的帧同步算法和理论分析，很好的学习材料-Frame synchronization in OFDM system algorithms and theoretical analysis, a very good learning materials Platform: |
Size: 481280 |
Author:fy |
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Description: 多天线正交频分复用(MIMO-OFDM,Multiple-Input and Multiple-Output Orthogonal Frequency Division Multiplex)系统中,精确的符号定时同步可使接收端解调数据时消除载波频率偏移和符号间干扰。而由于MIMO空间信道复杂度较高,使得单天线OFDM系统的同步方法不能直接应用于MIMO-OFDM系统中。提出的两步同步方法首先利用时域导频作为第一步同步进行粗同步,然后利用循环交织前缀作为第二步同步对每一个MIMO-OFDM符号进行同步偏差调整。需要指出的是,两次同步过程均可以产生尖锐的相关峰,使得同步精度大为提高。-Accurate timing synchronization of symbol is important for MIMO-OFDM system,and it can eliminate the integral frequency shift of carrier and intersymbol interference.Two-step timing synchronization method is proposed in this thesis.First,the time-domain pilot is employed to obtain coarse timing synchronization,then the interleaved cyclic prefix and maximum likelihood estimation method are adopted to adjust the synchronization difference,through which the correlational characteristic of that window could be ... Platform: |
Size: 807936 |
Author:王睿 |
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Description: MIMO OFDM 技术将成为第4 代移动通信系统的关键技术, 因MIMO OFDM 对时间和频率偏移非常敏感,
因此MIMO OFDM 同步显得尤为重要。提出了一种新的MIMO OFDM 定时同步和频偏同步技术。以GCL 序列为基础设
计了一个新的符合MIMO OFDM 同步技术的导频序列, 通过对该导频序列进行2 次相关得到频率估计, 并将所得频率
运用到定时同步中, 得到更为准确的时间估计。仿真结果表明, 在相同的信噪比情况下, 该方法可以使得系统的误码
率和帧传送误码率相对传统方法得到进一步减小。-MIMO OFDM will become a key technology of the fourth generation mobile communications system. However, MIMO OFDM is
sensitive to the CFO and timing synchronization, so the MIMO OFDM synchronization technology is very important. This paper proposes an
accurate technique for timing and frequency synchronization of multiple input multiple output ( MIMO ) orthogonal frequency division
multiplexing ( OFDM) systems. The technique derives a new preamble signal based on GCL sequences, according with the MIMJO OFDM
synchronization. The carrier frequency offset ( CFO) estimation is obtained through taking double correlation operations on the preamble signal,
and used in the timing synchronization to gain accurate time estimation. The simulation results show that at the same SNR, the proposed method
can reduce the BER and the frame transmission BER of the system compared to the conventional method. Platform: |
Size: 408576 |
Author:蜡笔 |
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Description: 简单地介绍了OFDM-UWB系统，在此基础上用matlab建立了简化的OFDM-UWB基带传输模型。然后分析了同步对系统的影响，可知同步模块是必要的，于是分析了现有的几种同步算法。
结合OFDM-UWB系统的特点，选择了基于同步序列的同步算法，它能同时实现载波和帧同步。然后设计了一种基于S&C算法的联合同步算法，最后用matlab实现了该算法，它能有效地降低BER，并验证了它的有效性。
-OFDM UWB systems synchronization algorithm based on the training sequence Platform: |
Size: 851968 |
Author:lovedh8 |
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Description: 在 OFDM 数学原理和收发模型的基础上，本文对帧同步、定时同步、频率同
步和采样同步给 OFDM 系统所产生的影响进行了理论分析，同时讨论了基于循环
前缀或训练符号的典型 OFDM 同步算法。参考 802.11a 突发数据帧结构和系统参
数，分析几种 OFDM 同步算法用于突发分组传输的性能；在分析了几种经典的信
道估计算法基础上,通过对复杂度和性能的折衷，选择一种适合本文系统的估计
算法。最后作者提出一种改进型 LS 信道估计算法，该算法考虑了 LS 算法中噪声
的影响，从而提高了低信噪比下信道估计的精度。仿真结果表明，改进算法在低
信噪比下具有良好的性能。
-OFDM mathematical principles and transceiver model based on frame synchronization, timing synchronization, frequency synchronization and sampling synchronization to the OFDM system, the impact of the theoretical analysis are also discussed based on the cyclic prefix or training symbols typical OFDM synchronization algorithm . Reference 802.11a burst data frame structure and system parameters, analyze several OFDM synchronization algorithm for burst packet transmission performance several classic channel estimation algorithm based on a compromise between complexity and performance, select a suitable estimation algorithm in this article. Finally, the author proposed a modified LS channel estimation algorithm that takes into account the effects of noise in the LS algorithm, thus improving the low SNR channel estimation accuracy. Simulation results show that the improved algorithm has good performance in low signal-to-noise ratio. Platform: |
Size: 8734720 |
Author:刘金强 |
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Description: 一篇关于OFDM同步技术研究的文章，主要研究了OFDM中的一些相关的同步技术，仿真是基于matlab的-A research on OFDM synchronization article mainly studies in OFDM some related synchronization technology, simulation is based on the matlab Platform: |
Size: 1793024 |
Author:wujueying |
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Description: MIMO-OFDM wireless communications with matlab 例程。包含propagation and fading、SISO channel models、MIMO Channel models、intorduction to ofdm、 synchronization for ofdm、channel estimation、Papr reduction、inter-cell interference mitigation techniques MIMO channel capacity,attenna diversty and space-time coding techniques, signal detection for spatially multiplexed mimo systems, exploitingchannel state information at the transmitter side, multi-user MIMO-MIMO-OFDM wireless communications with matlab routines. Includes propagation and fading, SISO channel models, MIMO Channel models, intorduction to ofdm, synchronization for ofdm, channel estimation, Papr reduction, inter-cell interference mitigation techniques MIMO channel capacity, attenna diversty and space-time coding techniques, signal detection for spatially multiplexed mimo systems, exploitingchannel state information at the transmitter side, multi-user MIMO Platform: |
Size: 801792 |
Author:吴世锋 |
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Description: 国外的一份关于802.11n资料的资料，对学习MIMO-ofdm的朋友非常实用。-A information about 802.11 n data abroad, MIMO- ofdm friend very practical to the study Platform: |
Size: 268288 |
Author:lily |
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Description: Synchronization in OFDM
With its robustness against multipath fading, orthogonal
frequency division multiplexing (OFDM) has become
the modulation of choice for many modern wireless standards.
However, OFDM is very sensitive to offsets in frequency and
time. This makes synchronization an essential part of an OFDM
system. This paper aims to motivate and analyze past work on
OFDM synchronization techniques. Platform: |
Size: 350208 |
Author:Mohamed |
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Description: 基于IEEE802.11n MIMO-OFDM的时域同步和频域同步，经典算法和改进算法的对比，并且中英文均包含-Time domain based on IEEE802.11 n MIMO- OFDM synchronization and frequency synchronization, classic algorithms and the comparison of improved algorithm, and are included in both English and Chinese Platform: |
Size: 398336 |
Author:李玉 |
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Description: 这是一个相对完整的OFDM通信系统的仿真设计，包括编码，调制，IFFT，
上下变频，高斯信道建模，FFT，PAPR抑制，各种同步，解调和解码等模
块，并统括系统性能的仿真验证了系统设计的可靠性。(This is a relatively complete OFDM communication system simulation design, including coding, modulation, IFFT,
Up and down frequency conversion, Gauss channel modeling, FFT, PAPR suppression, all kinds of synchronization, demodulation and decoding
Block, and overall system performance simulation of the system reliability.) Platform: |
Size: 40960 |
Author:包子君
|
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Description: 这是一个相对完整的OFDM通信系统的仿真设计，包括编码，调制，IFFT，
上下变频，高斯信道建模，FFT，PAPR抑制，各种同步，解调和解码等模
块，并统括系统性能的仿真验证了系统设计的可靠性。(This is a relatively complete OFDM communication system simulation design, including coding, modulation, IFFT,
Up and down frequency conversion, Gauss channel modeling, FFT, PAPR suppression, all kinds of synchronization, demodulation and decoding
Block, and overall system performance simulation of the system reliability.) Platform: |
Size: 38912 |
Author:cc12
|
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Description: ofdm系统仿真，完整的OFDM通信系统的仿真设计，包括编码，调制，IFFT，
%上下变频，高斯信道建模，FFT，PAPR抑制，各种同步，解调和解码等模
%块，并统括系统性能的仿真验证了系统设计的可靠性(OFDM system simulation, complete OFDM communication system simulation design, including coding, modulation, IFFT,
% up and down conversion, Gauss channel modeling, FFT, PAPR suppression, all kinds of synchronization, demodulation and decoding.
%, and the overall system performance simulation of the system reliability) Platform: |
Size: 41984 |
Author:1135775675@qq.com |
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