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Description: WLAN仿真－系统参数配置
系统参数主要分为2类：
一类是可以配置的，可以根据使用者的需求改变的参数
1）你打算让这个仿真跑多少个OFDM符号？
2）你打算采用什么样的调制方式？
3）你打算让你的系统跑在什么样的环境下，AWGN？Rayleigh fading?
4）你的接收端采用什么样的配置，比如，是否采用理想均衡，线性插值均衡，理想同步，频偏纠正等等？
5）你的信道采样频率是多少？你的载波频率是多少？
一类是固定不变的，发送端按照协议规定设置的一些参数
1）子载波个数，包括数据子载波，导频子载波。
2）保护间隔，pilot和preamble的数值。
举例：比如将这些参数汇总在一个m文件，global_parameter.m-err
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Size: 1024 |
Author: 福东方 |
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Description: WLAN仿真－发送机
wlan No Comments
设置完系统参数后，开始产生发送数据。
1. 产生随机的发送bit（tx_bits），这里不考虑信道编码。
2. QAM映射
3. 将数据映射到不同载波，形成OFDM符号
4. 产生pilot，并将pilot插入OFDM符号中
5. 加入dc和guard子载波
6. 进行ifft，将频域信号变到时域，并加入循环前缀
7. 对信号进行overlap window
8. 在时域产生short preamble
9. 在时域产生long preamble
10. 将preamble和数据符号组成packet
11. 升采样
得到信道传输的数据Tx_signal_up
具体程序见附件 wlan_transmitter.m-WLAN Simulation- wlan No Comments transmitter system parameters set finished, the beginning to have to send data. 1. Have sent random bit (tx_bits), here does not consider channel coding. 2. QAM mapping 3. The data is mapped to a different carrier to form OFDM symbols 4. Have a pilot, and pilot inserted OFDM symbols 5. Adding dc and guard subcarriers 6. To carry out ifft, will change the frequency domain signal to time domain, and add cyclic prefix 7. the signals overlap window8. In the time domain have a short preamble9. In the time domain have a long preamble10. the preamble and data symbols packet11. or sampling received data transmission channel Tx_signal_up specific procedures see Annex wlan_transmitter.m
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Size: 1024 |
Author: 福东方 |
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Description: this code is for Wimax(ieee standard 802.16) and other ofdm based transmitter and makes preamble for their training frames to make synchronization easier.
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Size: 1024 |
Author: amin |
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Description: OFDM 系统信噪比估计，matlab源代码-OFDM system, SNR estimation, matlab source code
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Size: 5120 |
Author: lulu |
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Description: MATLAB环境下基于OFDM系统的前导序列中短训练序列的误差估计仿真程序-the offset of the short training sequence of preamble
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Size: 1024 |
Author: xiahxp |
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Description: MATLAB环境下基于OFDM系统的前导序列中短训练序列的误差估计仿真程序-the offset of the long training secquence of preamble
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Size: 1024 |
Author: xiahxp |
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Description: Frequency offset estimation in 802.11a OFDM preamble
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Size: 4096 |
Author: sun2012flower |
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Description: 基于能量差分的ofdm帧同步算法matlab程序，可以运行-OFDM frame synchronization based on energy difference of the received preamble，can run
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Size: 1024 |
Author: 邢昊 |
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Description: OFDM系统中提出一种改进方法对频偏的捕获, 在联合使用9个短前导序列和长前导序列估计算法的基础上,采用鉴频环路的方法来消除算法中的除法和取模运算 -OFDM system in an improved way of deviation of the capture, in the joint use of nine short leader sequence and the long preamble sequence estimation algorithm, based on the frequency discriminator method to eliminate the loop algorithm in the division and modulo operation
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Size: 272384 |
Author: fy |
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Description: Script for computing the frequency offset from an OFDM short preamble constructed per symbol IEEE 802.11A specifications. -Script for computing the frequency offset from an OFDM short preamble constructed per symbol IEEE 802.11A specifications.
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Size: 1024 |
Author: abdelsalam |
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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.
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Size: 408576 |
Author: 蜡笔 |
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Description: 电力线上关于前导符号的信道估计技术，外文版-Preamble-based channel estimation echniques for OFDM/OQAM over the powerline
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Size: 217088 |
Author: 章都 |
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Description: IFFT 基于matlab实现，可用于OFDM前导训练序列的生成-IFFT OFDM preamble training sequence can be used to generate based on matlab implementation
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Size: 1024 |
Author: 过半年 |
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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同步算法对OFDM系统基于试点,使用前言快速、准确获取信号,在有限的时间建立同步,利用导频跟踪同步信息-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 a synchronization algorithms for OFDM system based on pilot, using the preamble to fast and accurate acquire signal, establish synchronization in the limited time, and using pilot to track synchronization information
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Size: 1267712 |
Author: wujueying |
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Description: Time Frequency Multiplex Preamble Design for Joint I1Q Imbalance, CFO and Channel Estimation in OFDM Systems
IEEE Paper
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Size: 1665024 |
Author: RITEN PATEL |
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Description: Script for computing the frequency offset from an OFDM short preamble
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Size: 1024 |
Author: Clinton |
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Description: Three Timing Synchronization Methods Based on Two Same Preambles for OFDM Systems
The purpose of this paper is to propose two fast timing synchronization methods of OFDM System which has two preamble symbols, the two preamble symbols are used for SNR estimation for OFDM systems. The synchronization techniques are examined in Multipath fading environments for comparison. The results of the performance
comparison are presented in terms of mean obtained by simulations.
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Size: 268288 |
Author: Mohamed |
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Description: Time and Frequency Synchronization Techniques for
OFDM Systems operating in Gaussian and Fading
Channels: A Tutorial
The aim of this paper is to survey and compare
previous methods for Data-aided timing and frequency
synchronization of OFDM System. In the sequel, we propose a fast
and accurate FFT-based frequency offset estimation. The
synchronization techniques are examined in Gaussian andMultipath fading environments for comparison. The results of the
performance comparison are presented in terms of mean andmean-square error (MSE) obtained by simulations. The timing
offset estimator with best performance is chosen for system timingsynchronization. The FFT-based frequency offset estimation
method has significantly smaller MSE than others can beperformed using the same timing training symbol. Therefore,there is only one training symbol needed as preamble in whole
synchronization process.
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Size: 340992 |
Author: Mohamed |
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Description: 可实现OFDM电力载波通信的前导序列检测，能进行连续多个前导检测-Can achieve OFDM power carrier communication leading sequence detection, can carry out a number of continuous preamble detection
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Size: 1024 |
Author: Zhong YJ |
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Description: OFDM preamble generation
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Size: 1201152 |
Author: elkassas |
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