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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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ncyoffset estimation and compensation technique , and Dopplerdiversity . Although the ICI self-cancellation scheme is avery simple way for suppressing ICI in OFDM systems, itresults in seriously loss of bandwidth. However, the methods ofother schemes are complex .This paper still focuses on the ICI cancellation scheme andits effect on OFDM communication systems, and presents anICI cancellation scheme. Its main idea is that the symbol shiftcancellation (SSC) method is used to cancel the impact of ICIon the far sub-carriers, and then the adjacent sub-channelinterference filter (ASIF) me..................[:=> 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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isition constraints. But it is more susceptible to local frequency offset and radio front-end non-linearities.
The frequencies used in OFDM system are orthogonal. Neighboring frequencies with overlapping spectrum can therefore be used. This property is shown in the figure where f1, f2 and f3 orthogonal. This results in efficient usage of BW. The OFDM is therefore able to provide higher data rate for the same BW.
2. OFDM Transceiver
Each sub-carrier in an OFDM system is modulated in amplitude and phase by the data bits. Depending on the kind ..................[:=> 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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nformation transfer speed, the time for each transmission necessarily becomes shorter. Since the delay time caused multipath, remains constant , ISI becomes a limitation in high data rate communication.
 Hence, OFDM is especially suitable for high speed communication due to its resistence to ISI as it avoids yhis problem by sending many low speed transmission simultaneously.
 In practice each OFDM channel consists of 128 to 2048 sub-carriers and can occupy bandwidth from 1.25 MHz to 20MHz. in addition each of these sub-carriers is modulated using BPSK , QPSK or 64 QAM modulation depend..................[:=> 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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MIMO-OFDM channel.
..................[:=> 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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/T=eAf where Af is the inter carrier spacing and T is the symbol interval. Let us assume that the initial frequency offset is not greater 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 i..................[:=> 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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gth separation is approximately 0.8nm. Using a multiplexing technique called DWDM , the spacing between adjacent frequencies is considerably less. So WDM systems carrying multiple optical signals in the vicinity of 1550nm with less than 200GHz are considered DWDM. Obviously , the more wavelengths used in a WDM system . the closer they are to each other and the more dense the wavelength spectrum.
Figure (3.4) shows the channel separation in DWDM systems. Ideally the port should transmit all the light at the centre of the optical channel, and no light outside. As usual , reality is a compromise..................[:=> 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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rence due to
multipath delays by incorporating a cyclic prefix.
The FFT block transforms the W-OFDM symbol from the time to the
frequency domain.
For synchronization, a direct sequence (DS) spread spectrum signal is
used. The OFDM receiver recovers the gain and frequency error
information from the synchronization message.
The amplitude and phase distortion caused during transmission is
determined by comparison of the original known signal with the OFDM
Equalizer removes the channel distortion and the prewhiteni..................[:=> Show Contents <=:]


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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DMA....................[:=> Show Contents <=:]

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