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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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selectivefading exist in radio channels, OFDM is very robust to radiochannel impairments. The receiver design is also simplifieddue to less complex equalization, and OFDM systems havehigh spectral efficiency due to overlapping sub-carrier spectra.However, one of the major disadvantages of such a multicarriermodulated system is the sensitivity of its performance tofrequency or phase offsets. Frequency offsets can result from aDoppler shift due to a mobile environment, as well as from acarrier frequency synchronization error. Such frequency offsetsresult in a loss of the carriers’ orthogonalit..................[:=> 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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long time, recent developments in DSP and VLSI technologies have made it a feasible option. This paper describes the VLSI implementation of OFDM in details. Specifically the 802.11a OFDM system has been considered in this paper. However, the same considerations would be helpful in implementing any OFDM system in VLSI.OFDM is fast gaining popularity in broadband standards and high-speed wireless LAN.
1. Introduction
OFDM is a multi-carrier system where data bits are encoded to multiple sub-carriers. Unlike single carrier systems, all the frequencies are sent simultaneously in time...................[:=> 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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hould be designed to minimize these type of adverse effect.
One of the remedy of the above problem is OFDM which is most efficient among other remedies. The principles of orthogonal frequency division multiplexing(OFDM) modulation have been in existence for several decades. However, in recent years these techniques have quickly moved out of text books and research laboratories and into practice in modern communications systems. Frequency division multiplexing(FDM) extends the concept of single carrier modulation by using multiple subcarriers within the same single channel.
..................[:=> 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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gain, between two distinct frequency bins. The size of such changes has an important effect both on system performance and design. In addition these results have applications in other areas, including temporal variation, feedback delay and channel estimation. Novel results presented include distributions and moments for changes in link gain and the maximum eigenvalue and autocorrelation functions for the link gain and maximum eigenvalue. Furthermore, some very simple approximate results for the ordered eigenvalue differences are presented and the accuracy of the analysis is verified by Monte ..................[:=> 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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larger than for the longer data symbols,since it estimates the fraction of carrier spacing, corresponds to a proportionately larger fractional offset for the longer data symbols. However, the MLE estimate is so accurate that in practice the initial estimate still may be adequate. If not, it is refined by following the shortened repeated symbols by a repetition 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);
x..................[:=> 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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s 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 centre of the optical channel, and no light outside. As usual , reality is a compromise. Normally the peak transmission at the centre wavelength is not 100% with a typical loss of 3 to 5dB. Normally the channels are equally spaced , so the points where the curves intersect match the widths of the channels or equivalently the channel separation. In the figure , this is 100Hz for th..................[:=> 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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maintain orthogonality between tones, it is necessary to ensure that
symbol time contains one or multiple cycles of each sinusoidal tone
waveform. This is normally the case, because the system numerology is
constructed such that tone frequencies are integer multiples of the
symbol period, as it is subsequently highlighted, where the tone
spacing is 1/T. figure. Shows three tones over a single symbol period,
where each tone has an integer number or cycles during the symbol.

Figure4 Time and Frequency domain representation of OFDM
The absolute terms, to generate a pur..................[:=> 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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excellent method for bi-directional wireless data communication. It is extremely efficient in mitigating common problems in high-speed communication such as multipath fading and RF noise interference. It can be considered as multiple access technique OFDMA....................[:=> Show Contents <=:]



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