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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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andwidth 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.Keywords: OFDM; ICI; BER; ASIF; SSC
I. INTRODUCTION
Orthogonal frequency division multiplexing (OFDM)technology has already been rapidly developed. OFDM hasalso been accepted for the next generation wirelesscommunication systems, such as B3G, Wimax and so on.Although multi-path propagation and frequency-selectivefading exist in radio channels, OFDM is very robust to radiochannel imp..................[:=> 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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s 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 Methodology
Early in the development cycle, different communication and signal processing algorithms are evaluated for their performance under different conditions like noise, multipath channel and radio non-linearity. Since most of these algorithms are coded in C or tools like Mat..................[:=> 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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eduction or the absence of this redundancy by properly exploiting null subcarriers that are inherent in standardized multicarrier systems. This method is not effective one.
2.2.2 Time Domain Windowing
This approach can be regarded as an improved version of the method using correlative coding, where the data samples of the tail subcarriers in an OFDM symbol are encoded with the data samples of the head ones in the same OFDM symbol, instead of being encoded with those of the subsequent OFDM symbol for the original approach. For low complexity, the modified correlative..................[:=> 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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ssion down the eigenchannels of the MIMO OFDM channel. Many extensions to this work are possible including LCRs in time as well as in frequency. The accuracy of the analytical approximations are verified by Monte Carlo simulations. ion for Research, Science and Technology of New Zealand.

INTRODUCTION

In this paper we consider a multiple-input multiple-output (MIMO) system 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 Wishar..................[:=> 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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n of the first full length data symbol.
Codes:
1.calculation of frequency offset:
clc; clear 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
..................[:=> 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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are carried together as separate wavelengths of light in a multiplexed signal. WDM is used in optical Fiber networks. It uses the same principle of FDM but applying to wavelength of light in optical fiber. WDM resembles FDM in that idea is to send information signals that occupy the same band of frequencies through the same fiber at the same time without interfering with each other. This is accomplished by modulating injection laser diodes that are transmitting highly concentrated light waves at different wavelengths. Therefore WDM is coupling light at two or more discrete wavelengths into an..................[:=> 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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age arriving at
the receiver. This is called multipath fading. The combination of all
paths at the receiver causes the modulated message to be distorted.
Thus the individual pulses overlap one another, and this is called
intersymbol interference. Each subcarrier in an OFDM signal has a very
narrow bandwidth, thus the symbol rate is very low. This results in the
signal having high tolerance to multi path delay spread, reducing any
significant intersymbol interference.
RF interference
To combat the effects of random signal noise, which can prevent the
receiver from ful..................[:=> 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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be considered as multiple access technique OFDMA....................[:=> Show Contents <=:]



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