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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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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 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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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 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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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 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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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 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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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 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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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 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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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 “ 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 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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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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