Description: This project aim was to build wireless software modem for data communication
between two computers using an acoustic interface in the voice frequency range (20Hz–
20,000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz –
20,000Hz) and the receiving antenna is a microphone (frequency response of: 100Hz –
16,000Hz). The test files used as information files were text files.
This goal was attained both in an incoherent scheme and in a coherent scheme.
Build under Matlab code, our modem uses OFDM (orthogonal frequency division
multiplexing) modulation, synchronization by LMS sequence, channel estimation (no
equalizer) via pilot tones. The symbols are either PSK or ASK for a constellation size of
2 or 4. To optimize the probability of error, these symbols were mapped using Gray
mapping.
Report-This project aim was to build wireless software modem for data communicationbetween two computers using an acoustic interface in the voice frequency range (20Hz-20000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz-20000Hz) and the receiving antenna is a microphone (frequency response of: 100Hz-16000Hz). The test files used as information files were text files.This goal was attained both in an incoherent scheme and in a coherent scheme.Build under Matlab code, our modem uses OFDM ( orthogonal frequency divisionmultiplexing) modulation, synchronization by LMS sequence, channel estimation (noequalizer) via pilot tones. The symbols are either PSK or ASK for a constellation size of2 or 4. To optimize the probability of error, these symbols were mapped using Graymapping.Report Platform: |
Size: 559104 |
Author: |
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Description: 这里是关于OFDM同步的一些文章，对做同步的朋友非常有用-Here are some of synchronization on the OFDM article to make a very useful synchronization Friend Platform: |
Size: 6078464 |
Author:qiluhui |
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Description: 一种基于PN训练序列的OFDM时频同步的新算法。通过构造倒序结构的同步训练序列，获得了较好的定时性能。-PN training sequence based on the OFDM time-frequency synchronization of the new algorithm. By constructing a reverse structure synchronization training sequence, to obtain a better performance from time to time. Platform: |
Size: 116736 |
Author:fisher |
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Description: 一种关于OFDM系统训练符号的改进同步算法。该算法克服了训练符号算法需要大的采样数据的缺点，缩短了定时捕获的时间。-A systematic training on the OFDM symbols to improve the synchronization algorithm. The algorithm overcomes the training symbols algorithm require large sampling data shortcomings, shortened the time to regularly capture. Platform: |
Size: 45056 |
Author:fisher |
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Description: 基于循环前缀的同步算法仿真，采用多符号求均值的办法减少噪声影响。-Cyclic prefix based synchronization algorithm simulation, the use of multi-symbol mean seeking ways to reduce noise impact. Platform: |
Size: 4534272 |
Author:herry |
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Description: 文章中研究了OFDM系统的时间同步问题，分析了系统的时间偏差容忍度-Research article in the OFDM system, time synchronization problems, analysis of system time deviation tolerance Platform: |
Size: 489472 |
Author:王云峰 |
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Description: OFDM,802.11的残余相位补偿算法，用于分析非理想同步的情况-OFDM, 802.11 residual phase compensation algorithm, is used to analyze the situation of non-ideal synchronization Platform: |
Size: 271360 |
Author:saintdream |
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Description: 64路OFDM系统MATLAB仿真，采用桢头同步，信道编码采用（7，4）汉明码，信道估计及修正采用LS方法，峰均抑制采用直接削波的方法，希望对大家有所帮助。-64 Road OFDM system MATLAB simulation, using the first-ching synchronization, channel coding used (7,4) hamming code, channel estimation and the amendment to the use of LS method, peak-to-average direct clipping suppression method, and they hope to be helpful to everyone. Platform: |
Size: 6144 |
Author:xiaoyuer |
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Description: it is a simulation about ML synchronization algorithm in OFDM systems,you can slao see a function picture in its output,that s useful for a beginner Platform: |
Size: 6144 |
Author:李明 |
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Description: 此程序是关于OFDM（正交频分复用）同步中信道响应的程序-This procedure is on the OFDM (Orthogonal Frequency Division Multiplexing) channel synchronization in response to the procedure Platform: |
Size: 2048 |
Author:郭振红 |
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Description: OFDM系统同步中的定时估计算法，主要使用了极大似然估计法。此程序实现极大似然估计法定时的程序。-OFDM system, synchronization of timing estimation algorithm, the main use of maximum likelihood estimation method. Realize this procedure maximum likelihood estimation when the statutory procedures. Platform: |
Size: 3072 |
Author:张彩 |
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Description: ofdm下的QAM调制解调系统实现，包括定时同步-QAM OFDM modulation and demodulation under the system implementation, including timing synchronization Platform: |
Size: 10240 |
Author:yanli |
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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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Search - ofdm synchronization