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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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epted 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 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 envir..................[:=> 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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ges over single carrier system like better multi-path effect immunity, simpler channel equalization and relaxed timing acquisition constraints. But it is more susceptible to local frequency offset and radio front-end non-linearities.
The frequencies used in OFDM system are orthogonal. Neighboring frequencies with overlapping spectrum can therefore be used. This property is shown in the figure where f1, f2 and f3 orthogonal. This results in efficient usage of BW. The OFDM is therefore able to provide higher data rate for the same BW.
2. OFDM Transc..................[:=> 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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gradation of network performance. A wireless network should 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 mu..................[:=> 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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land.

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 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 o..................[:=> 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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f 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 accuracy can become difficult in links, such as satellite links with multiple frequency translations.
We have presented the algorithm to estimate frequency offset from the demodul..................[:=> 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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DM)
4 Dense wavelength division multiplexing (DWDM) Coarse wavelength division multiplexing (CWDM)
3.1
Frequency Division Multiplexing (FDM)
Frequency division multiplexing assigns different carrier frequencies . Cable television uses FDM. In this technique , the carrier bandwidth is divided into sub-channels of different frequency widths , each carrying a signal at the same time in parallel. FDM is used at radio frequencies . With FDM , information signals with the same bandwidth from multiple sources modulate different frequencies. FDM signals propagate at the same time , through the sam..................[:=> 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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d incorporation of a small amount of guard time to each
symbol, enables the orthoganolity between tones to be preserved of
multipath. This is what enables OFDM to avoid the multiple access
interference that is present in CDMA systems.
The frequency domain representation of a number of tones, shown in
figure 4. Highlights the orthogonal nature of the tones used on OFDM
system. Notice that the peak of each tone corresponds to a zero level
or null of every other tone. The result of this is that there is no
interference between tones. When the receiver samples at the center ..................[:=> 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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s 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 ..................[:=> Show Contents <=:]



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