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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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on.Although multi-path propagation and frequency-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 offse..................[:=> 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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bes 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. OFDM offers several advantages over single carrier system like better multi-path effect immunity, simpler chan..................[:=> 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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ubcarrier 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 OFDM system becomes very sensitive to ICI. ICI destroys the orthogonality of the OFDM system which is overcome by the use of cyclic prefix mechanism.
2.2 different types of ICI cancellation schemes:
2.2.1Frequency Domain Equalization

Frequency doma..................[:=> 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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ting over frequency selective Rayleigh fading environments. Using the results in , here we develop analysis for calculating the LCR of BER in an adaptive MIMO-OFDM system which may use multiple eigenvalues. The results presented in this paper provide new insights into the BER analysis 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 consider each eigenmode as a random process in the frequency domain and compute the LCR for the BER of tr..................[:=> 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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the method of modulation. There are two deleterious effects caused by frequency offset; one is the reduction of signal amplitude in the output of signal amplitude in the output of the filters matched to each of the carriers and the second is introduction of ICI(intercarrier interference) from the other carriers which are no longer orthogonal to the filter. Because, in OFDM, the carriers are inherently closely spaced in frequency compared to the channel bandwidth, the tolerable frequency offset becomes a very small fraction of the channel bandwidth. Maintaining sufficient open loop frequency a..................[:=> 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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n couplers
i 1. Wavelength division MUX & DEMUX
Multiplexers or combiners mix or combine optical signals with different wavelength in a way that allows them to all pass through a single optical fiber without interfering with one another. Demultiplexers or splitters separate signals with different wavelengths in a manner similar to the way filters separate electrical signals of
! different frequencies. Wavelength demultiplexes have as many outputs as there are
j
! wavelengths, with each output going to a different destination. Multiplexes and ; demultiplexes are at the terminal ends of opt..................[:=> 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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adjusting the tones phase, amplitude or both. In addition to high speed
wireless application wired systems such as asynchronous digital
subscriber line (ADSL) and cable modem utilized. OFDM as its underlying
technology to provide a method of delivering high speed data. OFDM has
also been adopted into several European wireless communications such as
digital video broadcast and terrestrial digital video broadcast.
BIBLIOGRAPHY
1. Justin chuang ,Leonard j.cimini. IEEE Communications Magazine.
November 2001.
2. Des Brisay, Greg. Basics of orthogonal FDM
3. Welling, Keit..................[:=> 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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divides the communication channel into a number of equally spaced frequency bands. A sub carriers a portion of the users information in each band. Each sub carriers is orthogonal (Independent of each other) with every other sub carrier. OFDM efficiently squeezes multiple modulated carriers tightly together reducing the required bandwidth.OFDM was invested in 1960?s, only recently it has recognized as an 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 interf..................[:=> Show Contents <=:]



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