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An Intercarrier Interference Cancellation Technique Based on SSC-ASIF Scheme in OFDM


Posted by: seminar class
Created at: Wednesday 04th of May 2011 04:21:19 AM
Last Edited Or Replied at :Wednesday 04th of May 2011 04:21:19 AM
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ems, such as B3G, Wimax and so on.Although multi-path propagation and frequency-selectivefading exist in radio channels, OFDM is very robust to radiochannel impairments. The receiver design is also simplifieddue to less complex equalization, and OFDM systems havehigh spectral efficiency due to overlapping sub-carrier spectra.However, one of the major disadvantages of such a multicarriermodulated system is the sensitivity of its performance tofrequency or phase offsets. Frequency offsets can result from aDoppler shift due to a mobile environment, as well as from acarrier frequency synchronizati..................[:=> Show Contents <=:]



Abstract OFDM is a multi-carrier system where data bits are encoded to multiple sub


Posted by: seminar class
Created at: Monday 11th of April 2011 04:40:30 AM
Last Edited Or Replied at :Monday 11th of April 2011 04:40:30 AM
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.11a only or 802.11a+HiperLAN/2
5.2 Design trade-offs
• Area - Smaller the die size lesser the chip cost
• Power - Low power crucial for battery operated mobile devices
• Ease of implementation - Easy to debug and maintain
• Customizability - Should be customizable to future standards with variations in OFDM parameters
6. Algorithm survey & simulation
The simulation at algorithmic level is to determine performance of algorithms for various non-linearities and imperfections. The algorithms are tweaked and fine tuned to get the required performance. The followi..................[:=> Show Contents <=:]



Intercarrier Interference Compression in OFDM Communication Systems by Using Correlat


Posted by: seminar class
Created at: Thursday 24th of February 2011 11:08:28 PM
Last Edited Or Replied at :Thursday 24th of February 2011 11:08:28 PM
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ple subcarriers within the same single channel.
Let’s take a look on the following figure. In this figure W is the total bandwidth and Nis no. of carrier. We can see that for a given N, W of OFDM is less than or equal to W of FDM.
1.2 Transmitter of OFDM
Representation of ak , X(0), X(1), X(2), X(3) in graphical form:
 At first the transmitter converts the input data from a serial stream to parallel sets. Each set of contain one symbol Xk, for each subcarrier. For example, a set of four data would be 1 1 1 -1 -1.
 Suppose that this transmission takes 4 se..................[:=> Show Contents <=:]



Frequency Variation of Adaptive MIMO OFDM


Posted by: seminar surveyer
Created at: Tuesday 05th of October 2010 01:28:11 AM
Last Edited Or Replied at :Tuesday 05th of October 2010 01:28:11 AM
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simulations. In addition, we consider each eigenmode as a random process in the frequency domain and compute the LCR for the BER of transmission down the eigenchannels of the MIMO OFDM channel. Many extensions to this work are possible including LCRs in time as well as in frequency. The accuracy of the analytical approximations are verified by Monte Carlo simulations. ion for Research, Science and Technology of New Zealand.

INTRODUCTION

In this paper we consider a multiple-input multiple-output (MIMO) system in conjunction with orthogonal frequency division multiplexing (OFDM) ..................[:=> Show Contents <=:]



Orthogonal Frequency Division Multiplexing Frequency Offset Correction full report


Posted by: project topics
Created at: Sunday 25th of April 2010 11:46:50 PM
Last Edited Or Replied at :Thursday 18th of August 2011 01:30:07 PM
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ater than + or-5max. Then
Af initial>2Smax
determines the minimum initial carrier spacing, and the corresponding dft lengths. If the average power of the shortened symbols is kept the same, the variance of the estimate of einitial will be larger than for the longer data symbols,since it estimates the fraction of carrier spacing, corresponds to a proportionately larger fractional offset for the longer data symbols. However, the MLE estimate is so accurate that in practice the initial estimate still may be adequate. If not, it is refined by following the shortened repeated symbols by a repetit..................[:=> Show Contents <=:]



CWDM Coarse Wavelength Division Multiplexing full report


Posted by: project report tiger
Created at: Thursday 04th of March 2010 03:56:48 AM
Last Edited Or Replied at :Tuesday 26th of October 2010 03:06:35 AM
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requency division multipIexing(FDM)
Time division multiplexing (TDM) 4
Wavelength division multiplexing (WDM)
Comparison between FDM & WDM 5
Dense wavelength division multiplexing (DWDM)
Advantages of DWDM 9 j
Disad\outages of DWDM
Coarse wavelength division multiplexing^ WDM) 10
CWDM CIRCUIT COMPONENTS 12
AMPLIFICATION OF OPTICAL SIGNALS 14
Erbium doped fiber amplifiers Advantages of EDFAs
Optoelectronic amplifiers 15
ADVANTAGES OF CWDM 16
CONCLUSION 17
REFERENCES 18
LIST 01 i i(aim:s
NAME OF FIGURE PAGE NO:
PROPAGATION OF FDM 6
PROPAGATION OF WDM 6
CHANNEL SPACING IN DWDM ..................[:=> Show Contents <=:]



wideband ofdm full report


Posted by: computer science technology
Created at: Friday 22nd of January 2010 07:02:26 AM
Last Edited Or Replied at :Sunday 17th of July 2011 11:56:58 PM
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pplication wired systems such as asynchronous digital
subscriber line (ADSL) and cable modem utilized. OFDM as its underlying
technology to provide a method of delivering high speed data. OFDM has
also been adopted into several European wireless communications such as
digital video broadcast and terrestrial digital video broadcast.
BIBLIOGRAPHY
1. Justin chuang ,Leonard j.cimini. IEEE Communications Magazine.
November 2001.
2. Des Brisay, Greg. Basics of orthogonal FDM
3. Welling, Keith . Coded orthoragothonal FDM
4. Wireless Data communications September 2001
5. www.w..................[:=> Show Contents <=:]



WIDEBAND OFDM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:13:47 PM
Last Edited Or Replied at :Thursday 01st of April 2010 04:15:58 AM
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cing the required bandwidth.OFDM was invested in 1960?s, only recently it has recognized as an excellent method for bi-directional wireless data communication. It is extremely efficient in mitigating common problems in high-speed communication suc..................[:=> Show Contents <=:]



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