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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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ieddue 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’ orthogonality, and hence intercarrierinterference (ICI) occur. Currently, several approachesfor reducing ICI have been developed includin..................[:=> 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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imbalance
• FFT simulation to determine the optimum fixed-point widths
• Wave shaping filter to get the desired spectrum mask
• Viterbi BER performance for different SNR and traceback length
• Determine clipping levels for efficient PA use
• Effect of ADC/DAC width on the EVM and optimum ADC/DAC width
• Receive AGC
6.1 Fixed point simulation
One of the decisions to be taken early in the design cycle is the format or representation of data. Floating point implementation results in higher hardware costs and additional circuits related with normalizing of number..................[:=> 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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multaneously.
 In practice each OFDM channel consists of 128 to 2048 sub-carriers and can occupy bandwidth from 1.25 MHz to 20MHz. in addition each of these sub-carriers is modulated using BPSK , QPSK or 64 QAM modulation depending upon the requirements of the physical channel.
1.4OFDM System:
2.ICI cancellation
2.1 Introduction

Radio channel are random, fast changing and error prone. In a wireless system the variation/fluctuation in the received signal is called fading. The goal of the wireless system design is to overcome different types fading and provide reliable and efficie..................[:=> 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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ovide 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..................[:=> 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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requency 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 demodulated signals in the receiver. The algorithm extends to OFDM, with important differences, a method for single carrier MPSK. The technique involves the repetition of a data symbol and comparison of the phases of each of the carriers between the successive symbols. Since the modulation phase values are not ..................[:=> 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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called 3R regeneration , referring to reamplify , regenerate and retime. Weak incoming light is converted to a voltage signal. amplified , and then converted back to light. This is impractical in high speed networks.
6 ADVANTAGES OF CWDM
1. Enhanced capacity
2. Optical components used in this are simpler
3. More reliable
4. Less cost
5. It requires only one data modulator
6. Insensitive to optical reflection
7. High temperature operation
8. Wide operating temperature ranges
9. High coupling efficiency
SI. miliar Vi'.nnrt flfK
7
CONCLUSION
The development of CWDM
an intermedia..................[:=> 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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that they can
be separated out at the receiver without interference from neighbouring
carriers. In this manner, OFDM is able to space the channels much
closer together, which allows for more efficient use of spectrum than
through simple FDM.
Multipath fading
When radio signal travel from point to point they may bounce off
surrounding objects, resulting in multiple paths between transmitter
and receiver. This leads to several copies of the message arriving at
the receiver. This is called multipath fading. The combination of all
paths at the receiver causes the modulat..................[:=> 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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idered as multiple access technique OFDMA....................[:=> Show Contents <=:]



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