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 response might change during
....etc

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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 IEE802.11a 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 directed ....etc

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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 IEE 802.11a in USA and H ....etc

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sir i need ppt for simulation and bit error rate analysis of 4g ofdm systems by using different modulation schemes like qam,qpsk,bpsk ....etc

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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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To get full information or details of mimo ofdm channel estimation using pilot carriers please have a look on the pages

http://seminarsprojects.net/Thread-mimo-ofdm-based-air-interface-full-report?pid=17760&mode=threaded

if you again feel trouble on mimo ofdm channel estimation using pilot carriers please reply in that page and ask specific fields in mimo ofdm channel estimation using pilot carriers ....etc

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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 techniqu ....etc

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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 F ....etc

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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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Please send me the detailed overview of Channel tracking in Wireless OFDM systems. I request you to post it's current usage, it's background, it's future use. It's applications, competing technology, and the literature survey. ....etc

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