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Title: OFDM Mobile Channel
Page Link: OFDM Mobile Channel -
Posted By: Wifi
Created at: Monday 11th of October 2010 05:37:28 PM
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In this article, a technique for combating the effects of multipath propagation and cochannel interference on a narrow-band digital mobile channel is analysed. DFT(discrete Fourier transform) is used by this method to orthogonally frequency multiplex many narrow subchannels. These subchannels each signaling at a very low rate are thus combined into one high-rate channel.The effects of flat Rayleigh fading can be reduced significantly when this method is used alongwith pilot-based correction techniq ....etc

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Title: Simulation of OFDM and Bandwidth efficient Wireless OFDM
Page Link: Simulation of OFDM and Bandwidth efficient Wireless OFDM -
Posted By: seminar surveyer
Created at: Wednesday 29th of December 2010 02:57:19 PM
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By
JOSHI G



Abstract

The demand for high-speed mobile wireless communications is rapidly growing.
OFDM technology promises to be a key technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems of the near future. This work presents an investigation into methods for maximizing the spectral efficiency of Orthogonal Frequency Division Multiplexing (OFDM) systems. The current standards such as IEEE 802.11a in USA and ....etc

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Title: mimo ofdm channel estimation using pilot carriers ppt
Page Link: mimo ofdm channel estimation using pilot carriers ppt -
Posted By:
Created at: Wednesday 03rd of July 2013 09:34:42 PM
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Title: an improved dft based channel estimation algorithm for mimo ofdm systems matlab code
Page Link: an improved dft based channel estimation algorithm for mimo ofdm systems matlab code -
Posted By:
Created at: Friday 14th of September 2012 02:21:00 PM
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Dear Sir,
Can you please provide the code for An improved dft based channel estimation algorithm for mimo ofdm systems, as i have the code but the execution results are not related with the abstract results.
thanks in advance. ....etc

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Title: Preamble-based SNR Estimation in Frequency Selective Channels for Wireless OFDM Syste
Page Link: Preamble-based SNR Estimation in Frequency Selective Channels for Wireless OFDM Syste -
Posted By: seminar class
Created at: Friday 04th of March 2011 12:00:46 PM
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Preamble-based SNR Estimation in Frequency Selective Channels for Wireless OFDM Systems
Synopsis
Introduction
There are two general categories of average SNR estimators. Data-aided (DA) estimators are based on either perfect or estimated knowledge of the transmitted data. However, a certain portion of data is needed for estimation purposes, which reduces bandwidth efficiency. Blind or in-service estimators derive SNR estimate from an unknown information-bearing portion of the received signal preserving efficiency a ....etc

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Title: Channel Tracking in Wireless OFDM Systems full report
Page Link: Channel Tracking in Wireless OFDM Systems full report -
Posted By: seminar topics
Created at: Wednesday 31st of March 2010 02:55:02 PM
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Abstract”
In the presented paper, the principle of frequency domain channel estimation for wireless OFDM systems will be shown. A well known noise reduction technique will be adapted to HIPERLAN/2 and IEEE802.11a standards, and its positive effects will be demonstrated by simulation results. Channel tracking has not been considered by the WLAN standards named above, although it is well known that time-variant indoor radio channels can change their characteristics within one PHY burst. This paper presents some techniques for decision ....etc

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Title: Preamble-based SNR Estimation in Frequency Selective Channels for Wireless OFDM Syste
Page Link: Preamble-based SNR Estimation in Frequency Selective Channels for Wireless OFDM Syste -
Posted By: seminar class
Created at: Wednesday 09th of March 2011 01:22:30 PM
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Presented by:
M.N.N.V.SAIRAM
M.SUBRAMANYAM KUMAR
G.RAHUL VARMA


Preamble-based SNR Estimation in Frequency Selective Channels for Wireless OFDM Systems
AIM:
To develop an efficient algorithm for the average SNR estimation in wireless OFDM systems.
BACK GROUND:
• OFDM is a multicarrier modulation scheme that provides strong robustness against inter symbol interference (ISI) by dividing the broadband channel into many narrowband sub- channels in such a way that attenuation ....etc

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Title: mat lab code for an improved dft based channel estimation algorithm for mimo ofdm systems
Page Link: mat lab code for an improved dft based channel estimation algorithm for mimo ofdm systems -
Posted By:
Created at: Tuesday 08th of January 2013 01:35:43 PM
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i need mat lab code for an improved dft based channel estimation algorithm for mimo ofdm systems
sent me the mat lab code for an improved dft based channel estimation algorithm for mimo ofdm systems ....etc

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Title: Studies on DWT-OFDM and FFT-OFDM Systems
Page Link: Studies on DWT-OFDM and FFT-OFDM Systems -
Posted By: seminar surveyer
Created at: Friday 15th of October 2010 02:44:15 PM
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Prepared by:
Khaizuran Abdullah
Zahir M. Hussain


Abstract

Comparative studies on DWT-OFDM and FFTOFDM systems are presented. The model for DWT-OFDM includes zero-padding and vector transpose for transmitting the OFDM signal. MATLAB simulation commands are also described. The discrete wavelet transform-OFDM (DWT-OFDM) has to satisfy the orthonormal bases and the perfect reconstruction properties to be considered as wavelet transform. Different wavelet families have been used and compared with the conventional ....etc

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Title: Channel Estimation for OFDM System with Two Training Symbols Aided and Polynomial Fit
Page Link: Channel Estimation for OFDM System with Two Training Symbols Aided and Polynomial Fit -
Posted By: seminar details
Created at: Friday 08th of June 2012 02:58:53 PM
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Channel Estimation for OFDM System with Two Training Symbols Aided and Polynomial Fitting




INTRODUCTION

ORTHOGONAL frequency division multiplexing
(OFDM) is a high spectral efficiency transmission
scheme. It divides a wideband signal into many orthogonal
subcarriers and induces a symbol period that is much
longer than the bit duration. However, a long symbol
period is sensitive to the time-varying channel in wireless
communications. The channel respo ....etc

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