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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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frequency-domain equalizationscheme , time-domain windowing scheme , frequencyoffset estimation and compensation technique , and Dopplerdiversity . 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 th..................[:=> 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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omposite time-domain signal is achieved using Fast Fourier transform. Different coding schemes like block coding, convolutional coding or both is used to achieve better performance 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 mention..................[:=> 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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reduction 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 correlati..................[:=> 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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nalysis of an adaptive system. It is worth reiterating that we focus on BER as a process in frequency across the OFDM block. Hence we consider variations in BER across the bins and not over time. In particular, we consi..................[:=> 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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d the ICI, contribute coherently to the estimate so that it is possible to obtain very accurate estimates even when the offset is too great, that is there is too much ICI to demodulate the data values. Since the estimate error depends only on total symbol energy, the algorithm works well in the multipath channels.
However, it is required that the frequency offset as well as the channel impulse response be constant for a period of two consequtive symbols.
References:
1. .R.W.Chang, synthesis of band limited orthogonal signals for multi
channel data transmission, Bell syst.Tech. J, vol 45,..................[:=> 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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selective optical multiplexes and demultiplexes are used at the start and end of the transmission route.
CWDM uses a special property of fiber optics. This property allows the combination of multiple signals into a single fiber. Each signal is assigned to a different wavelength of light. It provides an easy way to increase the Utilization of the high channel capacity of the optical fiber. It can be applicable in telecommunication areas.
CONTENTS
TITLE PAGE NO:
INTRODUCTION I
MULTIPLEXING 2
MULTIPLEXING TECHNIQUES 3
Frequency division multipIexing(FDM)
Time division multiplexing (TDM) ..................[:=> 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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ing transmission. The bits entering the
encoder are grouped into bocks.
Modulator
The modulator transforms the encoded block of bits into a vector of
complex values which is the W-OFDM symbol in the frequency domain.
Groups of bits are mapped onto a modulation constellation producing a
complex value representing a modulated carrier. The carrier
representing DC is not modulated to eliminate complications with DC
levels. Some carriers called pilot carriers are modulated with known
values to allow the demodulator to adjust amplitude and phase. There
are multiple pilot c..................[:=> 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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nce. It can be considered as multiple access technique OFDMA....................[:=> Show Contents <=:]



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