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## An Intercarrier Interference Cancellation Technique Based on SSC-ASIF Scheme in OFDMPosted 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 | An Intercarrier Interference Cancellation Technique Based on SSCASIF Scheme in OFDM,
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plerdiversity . 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) method is used to cancel the impactof ICI on the adjacent sub-..................[:=> Show Contents <=:] | |||

## Abstract OFDM is a multi-carrier system where data bits are encoded to multiple subPosted 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 | abstract for ofdm ,
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ance in low SNR conditions. Interleaving is done which involves assigning adjacent data bits to
non-adjacent bits to avoid burst errors under highly selective fading. In the approach shown in Figure the entire functionality is implemented in hardware. Following are the advantages of this approach: • Lower gate count compared to DSP+RAM+ROM, hence lower cost • Low power consumption Due to the advantages mentioned above a VLSI based approach was considered for implementation of an 802.11a Base band. Following sections describe the VLSI based implementation in details. 4. Design Me.................. [:=> Show Contents <=:] | |||

## Intercarrier Interference Compression in OFDM Communication Systems by Using CorrelatPosted 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 | Intercarrier Interference Compression in OFDM Communication Systems by Using Correlat,
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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 depending upon the requirements of the physical channel. 1.4OFDM System.................. [:=> Show Contents <=:] | |||

## Frequency Variation of Adaptive MIMO OFDMPosted 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 | power frequency variations,
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ariance of the link gain difference, and the ACF of the link gain. -Simple approximations to the ACF of the maximum eigenvalue and to the variance of the maximum eigenvalue difference. The second part of this paper focuses on the level crossing rates (LCRs) of BERs across the frequency bins of a MIMO-OFDM system operating over frequency selective Rayleigh fading environments. Using the results in , here we develop analysis for calculating the LCR of BER in an adaptive MIMO-OFDM system which may use multiple eigenvalues. The results presented in this paper provide new insights into the.................. [:=> Show Contents <=:] | |||

## Orthogonal Frequency Division Multiplexing Frequency Offset Correction full reportPosted 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 | orthogonal frequency division multiplexing definition,
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all; close all; x1= randint(1,1020);%generating a random number for i=1:1020 if (x1(i)>0.5) x1(i)=1; else x1(i)=0; end end disp(x1); x2=reshape(x1,4,255);%to convert 1 by 1020 to 255 by 4 for n=1:4 x3(:,n)=ifft(x2(:,n),255);%ifft of the random signal end y=awgn(x3,10);%adding the awgn noise for p=1:4 xx(:,p)=fft(x3(:,p),255);%taking fft of transmitted signal end x7=reshape(xx,1,1020); x8=abs(x7); for v=1:1020 if (abs(x8(v))-abs(x1(v)))<=0.5%to convert into a 1 or 0 x8(v)=0; end end q=0; for c=1:1020 if(x1(c)==x8(c)) q=q+1;%number of error free signals end end disp(q);%disp.................. [:=> Show Contents <=:] | |||

## CWDM Coarse Wavelength Division Multiplexing full reportPosted 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 | dwdm bandwidth,
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ed in multiples of 100C.il lz. At 1550nm and 100GHz frequency spacing , the wavelength 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 cent.................. [:=> Show Contents <=:] | |||

## wideband ofdm full reportPosted 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 | wideband delphi estimation process ,
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plied to the signal before transmission this has the effect of spreading the symbols over many frequencies, white maintaining the ability to recover the symbols even if some carriers are subjected to noise. LEADING â€œ EDGE MOBILE OFDM TECHNOLOGIES Unlike most existing forms of wireless access, including 3G technologies, conventional wireless systems have been designed primarily at the physical layer. To address the unique demands posed by mobile users of high speed data applications, new air interface must be designed and optimized across all the layers of the pr.................. [:=> Show Contents <=:] | |||

## WIDEBAND OFDMPosted 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 | ofdm books ,
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ion technique that divides the communication channel into a number of equally spaced frequency
bands. A sub carriers a portion of the users information in each band. Each sub carriers is
orthogonal (Independent of each other) with every other sub carrier. OFDM efficiently squeezes
multiple modulated carriers tightly together reducing 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
such as multipath fading ..................[:=> Show Contents <=:] |

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