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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: 本文在分析移动无线信道衰落特性的基础上,阐述了OFDM系统的基本原理,主要研究了OFDM通信系统中的基于导频符号的信道估计问题,分析了几种经典的信道估计算法以及相关的关键技术环节。 在此基础上介绍了OFDM技术在现实中的一个应用——WLAN IEEE802.11a系统模型,利用Matlab仿真软件完成OFDM系统信号生成、噪声生成、导频插入、循环前缀、调制、解调等部分的设计,最后结合计算机仿真对系统关键技术(导频、循环前缀、估计算法)的有效性和可行性进行了全面的分析与比较。适合matlab研究-Based on the analysis of mobile channel fading characteristics based on the OFDM system on the basic principles of research in the OFDM communication system of the pilot symbols based on channel estimation problem, an analysis of several classical channel estimation algorithm and the associated key technical links. On this basis, introduced OFDM technology in a practical application- WLAN IEEE802.11a system model, using Matlab simulation software to complete OFDM signal generation, noise generation, pilot insertion, cyclic prefix, modulation, demodulation and other parts of the design, the final combination of computer simulation of the system of key technologies (pilots, cyclic prefix, it is estimated that algorithm) the effectiveness and feasibility of a comprehensive analysis and comparison. Suitable for research matlab
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Size: 1339392 |
Author: 赵洪森 |
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Description:
The simulator GUI is started with command ui_start in Matlab command window.
WLAN simulation starts by clicking the Start Simulation button in the GUI window.
WLAN simulation can be terminated, before set number of packets have been reached by pressing control-C .
##### Version updates and bug fixes
January 24th 2002: A bug in file rx_qpsk_demod.m fixed
July 31th 2002: A bug in file rx_gen_chan_amps.m fixed. This bug affected performance in fading channels.
April 15th 2003: Changed the code not to require functions from the Matlab Communications toolbox.
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The simulator GUI is started with command ui_start in Matlab command window.
WLAN simulation starts by clicking the Start Simulation button in the GUI window.
WLAN simulation can be terminated, before set number of packets have been reached by pressing control-C .
##### Version updates and bug fixes
January 24th 2002: A bug in file rx_qpsk_demod.m fixed
July 31th 2002: A bug in file rx_gen_chan_amps.m fixed. This bug affected performance in fading channels.
April 15th 2003: Changed the code not to require functions from the Matlab Communications toolbox.
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Size: 29696 |
Author: weihuagao |
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Description: this is my journal paper about fading over wlan
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Size: 531456 |
Author: marzieh |
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Description: This demo shows how to simulate multiple-input multiple-output (MIMO) multipath fading channels based on the IEEE® 802.11n channel models for indoor wireless local area networks (WLAN). -This demo shows how to simulate multiple-input multiple-output (MIMO) multipath fading channels based on the IEEE® 802.11n channel models for indoor wireless local area networks (WLAN).
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Size: 177152 |
Author: riham |
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Description: 中文摘要
正交频分复用（ OFDM ， Orthogonal Frequency Division
Multiplexing）是当前一种非常热门的通信技术。它即可以被看作是一种
调制技术，也可以被看作是一种复用技术。由于它具有抗多径衰落和频谱
利用率高的特点，因此被广泛应用于高速数字通信领域，比如应用于IEEE
802.11a无线局域网（WLAN）的物理层等等。
我的毕业设计的核心任务是：采用 FPGA 来实现一个基于OFDM 技术
的通信系统中的基带数据处理部分，即调制解调器。其中发射部分的调制
器包括：信道编码（Reed-Solomon 编码），交织，星座映射，FFT和插
入循环前缀等模块。我另外制作了相应的解调器，可以实现上述功能的逆
变换。
另外，我还对OFDM技术， IEEE 802.11a的标准文献，基于Simulink
的 OFDM 模型和仿真，ALTERA 公司的技术和 IP Core 的使用等方面进
行了研究。这些在文章中都有体现。
-Abstract
Orthogonal frequency division multiplexing (OFDM, Orthogonal the Frequency Division,
Multiplexing) is a very popular communication technology. It can be seen as a
Modulation technique can also be seen as a multiplexing technique. Because of its resistance to multipath fading and spectrum
High utilization characteristics, and is widely used in high-speed digital communications, such as used in IEEE
802.11a wireless LAN (WLAN) physical layer.
The core mission of my graduation project: FPGA to implement a technology based on OFDM
Communication systems in baseband data processing part, ie the modem. These emission part of the modulation
Includes: channel coding (Reed-Solomon coding), interleaving, constellation mapping, FFT and interpolation
Into the cyclic prefix modules. I also produced a corresponding demodulator can achieve the inverse of the above functions
Transformation.
In addition, OFDM technology, the IEEE 802.11a standard literature, based on Simulink
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Size: 1553408 |
Author: 万利 |
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Description: This text first gives an introduction of WLAN 802.11a standards work principle, structure and key technique. The most important part in this text is WLAN wireless channel s big-scale fading and small-scale fading and their modeling and simulating methods. The models of big-scale fading and small-scale fading are selected and the wireless channel is build for 802.11a’s link level simulation. At last the simulation result is analyzed, and the result indicates that the wireless channel is right.-This text first gives an introduction of WLAN 802.11a standards work principle, structure and key technique. The most important part in this text is WLAN wireless channel s big-scale fading and small-scale fading and their modeling and simulating methods. The models of big-scale fading and small-scale fading are selected and the wireless channel is build for 802.11a’s link level simulation. At last the simulation result is analyzed, and the result indicates that the wireless channel is right.
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Size: 214016 |
Author: yuck |
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Description: Timing Synchronization for 802.11a WLANs under Multipath Channels
In the Wireless Local Area Network
(WLAN) standard adopted by the IEEE 802.11a
standardization group, each data packet starts with a
preamble, which consists of ten short training symbols
followed by two long training symbols. In this paper,
we present an efficient and straightforward coarse
timing synchronization scheme based on the short
training symbols. Simulation results illustrate that the
performance of the proposed scheme is comparable
and even superior to that of the conventional timing
synchronization method under multipath fading
channels. We further show that the combination of
the proposed auto-correlation coarse timing
synchronization scheme and a frequency domain path
delay moving average method leads to a desirable
result of symbol timing estimation.
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Size: 218112 |
Author: Mohamed |
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