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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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adjacent sub-channel interference filter (ASIF) methodis used to cancel the impact of ICI on the
adjacent sub-carriersinterference. By analyzing the distribution of the adjacent
intercarrierinterference, a pilot-symbol scheme is proposed toimprove the accuracy of channel
estimation and simplify theadjacent interference filter method. The proposed algorithm canachieve
trade-off between the bandwidth efficiency and thecomplexity of ICI cancellation method. Simulation
results showthat the technique proposed in this paper can effectively improveBER (Bit Error Rate)
performance of the OFDM system.K..................[:=> 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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h data of different ranges. But this however is not true as the Baseband circuits have a fair idea
of the range of values they will work on. So a fixed-point representation will be more efficient.
Further in fixed point a choice can be made between signed and 2's complement representation. The width of representation need not be constant throughout the Baseband and it depends on the accuracy needed at different points in transmit or receive path. A small change in the number of bits in the representation could result in a significant change in the size of arithmetic circuits especially multi.................. [:=> 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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es another type of interference in OFDM i.e. inter carrier interference (ICI). OFDM divided the
spectrum into narrowband subcarriers and they are tightly spaced simply because they are orthogonal.
One of the requirements for orthogonality is to maintain the subcarrier spacing exactly the
reciprocal of the symbol period. The figure below shows the frequency shifts thus changing the
subcarrier spacing which results in the loss of orthogonality. This loss of orthogonality creates
interference among the signals which is called as ICI. Since the subcarriers in OFDM are usually
very narrow hence the..................[:=> 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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tem in conjunction with orthogonal frequency division multiplexing (OFDM) operating over frequency
selective Rayleigh and Rician fading environments. In particular we focus on the eigenvalues of the
complex Wishart matrices defined for each OFDM subcarrier and investigate their variation across
frequency. Since the throughput and performance of such a system are heavily dependent on the
eigenvalues, the results and analysis presented have many applications. Examples include the
performance of beamforming systems which is governed by the maximum eigenvalue and the link gain
which is characteriz..................[:=> 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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FDM symbols: clc; x1= randint(1,150);%generating a random number figure(1); subplot(4,1,1); plot(x1);%plots the random signal title('random signal'); x2=x1';%converting 1 by 150 to 150 by 1 x3=ifft(x2,150);%taking ifft y=awgn(x3,30);%adding the awgn noise disp(y); x4=fft(y,150);%taking fft of the received signal x5=abs(x4'); disp(x5); for p=1:1:150 if x5(p)>0.5 x5(p)=1; elseif x5(p)<0.5 x5(p)=0;%converting complex to 1 and 0 end end q=0; for i=1:1:150 if (x1(i)-x5(i))==0 q=q+1;%counting the number of error free signals end end disp(q); subplot(4,1,2); plot(x5);%plots the ou.................. [:=> 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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xing. Wavelength division multiplexing is a technique which uses a special property of liber optics.
This property allows the combination of multiple signals onto a single strand of liber. Each signal
is assigned to a different wavelength of light . Since one wavelength does not aiTect another
wavelength, the signals do not interfere. Coarse wavelength division multiplexing (CWDM) performs two functions. First, they filter the light, ensuring only the desired wavelengths are used. Second, they multiplex or demultiplex multiple wavelengths, which are used on a single fiber link. The difference.................. [:=> 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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containing the message is divided up into parallel bit streams of lower frequency carriers or sub carriers. These subcarriers are designed to be orthogonal to another, so that they can be separated out at the receiver without interference from neighbouring carriers. In this manner, OFDM is able to space the channels much closer together, which allows for more efficient use of spectrum than through simple FDM. Multipath fading When radio signal travel from point to point they may bounce off surrounding objects, resulting in multiple paths between transmitter and recei.................. [:=> 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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with every other sub carrier. OFDM efficiently squeezes multiple modulated carriers tightly
together reducing the required bandwidth.OFDM wa..................[:=> Show Contents <=:] |

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