Description: 频率同步代码，可以从中知道频偏造成的系统BER性能的情况-frequency synchronization code, we can know the Offset System BER performance of Platform: |
Size: 365568 |
Author:张开 |
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Description: 很好的OFDM的基于MATLAB的仿真程序包，且包含了最终结果图.-montecarlo
type montecarlo in the command window and wait for a long time..
_simulation of the complete OFDM system.
_use of a very large file in order to get probabilities.
_loop over different value of the noise.
_compute the SNR for each value of the noise.
_provide the SNR/BER plot.
if you are in a rush : simulation_system !!
go into the right folder and type simulation_system in the command window.
_then type the value of the noise power (range = [-20,10])
_the function provides the channel estimation, the bit allocation,
and a plot illustrating the errors.
_this is a fast function (less pilot, no synchronization, small file). Platform: |
Size: 96256 |
Author:田静 |
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Description: 设计了一个OFDM接收机，并采用1fI公司的TMS320C6416芯片进行实现。在假设理想
同步的前提下，该系统进行了FFT变化、使用了Ls(最小二乘法)进行信道估计，并且采用了
QPSK算法进行解调。最后将接收机输出数据与发端数据进行比较，在不同信噪比情况下计算其
误码率，得出了比较理想的结果。-An OFDM receiver is designed in山is paper and realized on the platform of the 1MS32OC6416 chip
of the TI company．Under the assumption of ideal synchronization．n叩transformation is realized in the system
wit}l LS method implemented in the channel estimation module and QPSK used in the demodulation module．
Finally，BER is calculated in different cases of SNR and the result is achieved as expected． Platform: |
Size: 243712 |
Author:王熹 |
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Description: 该模型实现了一个通用的OFDM TX和RX，这是不依赖于任何特定的行业标准。该模型的目标是开发和研究不断（不是“突发”）载波同步和定时跟踪方案。该技术纳入然后可以扩展和修改，以标准的具体通讯套件。该模型采用了“收购”技术，它利用了循环前缀相关属性，以赶在试图完成罚款跟踪算法一帧的边界粗略的估计。该模型实现了一个16点64循环前缀的OFDM载波波形。在OFDM符号有16个飞行员，3后卫音（0，带边幅），并使用45 QAM的剩余数据流4。
这包括最新型的衰落信道，误码率计算，并改善控制回路动态。-This model implements a generic OFDM TX and RX, which is not tied to any particular industry standard. The objective of this model is to develop and explore a continuous (not “bursty”) carrier and timing tracking synchronization scheme. The techniques incorporated can then be extended and modified to suite specific communications standards. The model uses an “acquisition” technique that exploits the correlation properties of the cyclic prefix to get a rough estimate of the frame boundary before attempting to accomplish the fine tracking algorithms. The model implements a 64 carrier OFDM waveform with a 16 point cyclic prefix. The OFDM symbol has 16 pilots, 3 guard tones (0 amplitude at band edge) and uses 4 QAM for the 45 remaining data streams.
This latest model includes a fading channel, BER computation, and improved control loop dynamics.
Platform: |
Size: 293888 |
Author:zaaa |
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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: 学生编写的OFDM仿真系统，主要是将仿真结果的BER与理论曲线相比较，还考虑了多径瑞利信道加CP对系统的影响以及同步误差对BER的影响，附报告-Students prepare the OFDM simulation system, mainly to the BER simulation results compared with the theoretical curve, also considered multipath Rayleigh channel plus CP impact on the system as well as the impact of synchronization errors on the BER, with reports Platform: |
Size: 277504 |
Author:张续 |
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