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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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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 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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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 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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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 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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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 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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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 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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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 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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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 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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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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