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Adaptive modulation Performance of wideband OFDM communications


Posted by: kushal418
Created at: Friday 09th of March 2012 07:11:33 AM
Last Edited Or Replied at :Wednesday 17th of April 2013 11:31:34 PM
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can u please send furthur information about adaptive modulation performance of wideband OFDM communic..................[:=> Show Contents <=:]



adaptive modulation performance of wideband ofdm communications


Posted by:
Created at: Thursday 23rd of February 2012 05:55:58 AM
Last Edited Or Replied at :Thursday 23rd of February 2012 05:55:58 AM
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please provide me the bstract and ful d..................[:=> Show Contents <=:]



WIDEBAND OFDM


Posted by: smart paper boy
Created at: Saturday 16th of July 2011 03:17:51 AM
Last Edited Or Replied at :Saturday 16th of July 2011 03:17:51 AM
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th fading and RF noise interference. It can be considered as multiple access technique OFDMA.
..................[:=> 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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s.
CONCLUSION
W-OFDM for mobile data communication can be thought of as combination
of modulation and multiple access schemes. Like CDMA multiple users
share a given bandwidth in OFDM. OFDM provides the best of the
benefits of TDMA. OFDM divides the spectrum into a number of equally
spaced tones and carries a portion of the usersâ„¢ information on each
tone. A tone can be thought of as a frequency. OFDM has an important
property that each tone is orthogonal to the other.
OFDM is a modulation technique that it enables user data to be
modulated onto the tones. The in..................[:=> Show Contents <=:]



Adaptive Multipath Detection34


Posted by: juleehelenmathew
Created at: Tuesday 24th of November 2009 02:39:10 AM
Last Edited Or Replied at :Tuesday 24th of November 2009 04:33:01 AM
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i want details and ..................[:=> 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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her sub carrier. OFDM efficiently squeezes multiple modulated carriers tightly together reducing the required bandwidth.OFDM was invested in 1960?s, only r..................[:=> Show Contents <=:]



High Speed OFDM Packet Access HSOPA


Posted by: computer science crazy
Created at: Monday 23rd of February 2009 02:03:39 PM
Last Edited Or Replied at :Saturday 08th of December 2012 03:14:48 AM
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bined HSDPA/HSUPA system The 3GPP LTE project by incorporating the HSOPA achieves the quadruple play services - voice, high-speed interactive applications including large data transfer and feature-rich IPTV with full mobility. Even though UMTS along with HSDPA and HSUPA gives high data transfer rates, wireless data usage, the competition from state-of-the-art technologies like the WiMAX has forced the UTMS to strengthen their network with the HSOPA that provides with increased data speeds, and spectral efficiency thus giving way for more functionality. Another advantage is with respect to the ..................[:=> Show Contents <=:]



Wideband Sigma Delta PLL Modulator Download Full Report And Abstract


Posted by: computer science crazy
Created at: Saturday 21st of February 2009 02:37:30 PM
Last Edited Or Replied at :Monday 03rd of October 2011 11:20:21 PM
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ional N PLL has the disadvantage that it generates high tones at multiple of channel spacing. Using digital sigma delta modulation techniques. we can randomize the frequency division ratio so that quantization noise of the divider can be transferred to high frequencies thereby eliminatory the spurs.



CONVENTIONAL PLL

The advantages of this conventional PLL modulator is that they offer small frequency resolution, wider tuning bandwidth and fast switching speed. But they have insufficient bandwidth for current wireless standards such as GSM. so that they cannot be used as a closed loo..................[:=> Show Contents <=:]



Ultra Wide Band Download Full Report And Abstract


Posted by: computer science crazy
Created at: Saturday 21st of February 2009 02:30:29 PM
Last Edited Or Replied at :Monday 27th of February 2012 01:39:28 AM
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less than 500 picoseconds in duration is a monumental engineering challenge.


(Download Full Report And Abstract)


Download..................[:=> Show Contents <=:]



Ultra Wide Band


Posted by: computer science crazy
Created at: Saturday 21st of February 2009 11:03:01 AM
Last Edited Or Replied at :Wednesday 17th of March 2010 08:40:26 PM
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ages “ Current UWB devices can transmit data up to 100
Mbps, compared to the 1 Mbps of Bluetooth and the 11 Mbps of 802.11b.
Itâ„¢s expected to reach around 500 Mbps by 2004. Also, this low
power pulse can penetrate obstacles like doors, walls, metal etc. It
doesnâ„¢t require allocation of Ëœpreciousâ„¢ or
Ëœpaid forâ„¢ narrow-band spectrum, in use now. Best of all,
it costs a fraction of current technologies like Blue-tooth, WLANs and
Wi-Fi. UWB doesnâ„¢t suffer from multi-path interference (where
signals reach the receiver after traveling through two or ..................[:=> Show Contents <=:]



Ultra-Wideband


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:50:13 PM
Last Edited Or Replied at :Sunday 21st of September 2008 11:50:13 PM
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l phones, wireless LANs and so on are like that: a continuous signal that's overlaid with information by using one of several modulation techniques.

Now picture the same guy watering his lawn with a swiveling sprinkler that shoots many, fast, short pulses of water. That's typically what UWB is like: millions of very short, very fast, precisely timed bursts or pulses of energy, measured in nanoseconds and covering a very wide area. By varying the pulse timing according to a complex code, a pulse can represent either a zero or a one: the basis of digital communications.

Wireless technolog..................[:=> 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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multipath fading and RF noise interference. It can be considered as multiple access technique OFDMA....................[:=> Show Contents <=:]



Ultra-Wideband


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:56:16 AM
Last Edited Or Replied at :Wednesday 17th of March 2010 08:39:26 PM
Ultra Wideband , ultra wide band,
e up and down in a smooth vertical motion. You can see a continuous stream of water in an undulating wave. Nearly all radios, cell phones, wireless LANs and so on are like that: a continuous signal that's overlaid with information by using one of several modulation techniques.

Now picture the same guy watering his lawn with a swiveling sprinkler that shoots many, fast, short pulses of water. That's typically what UWB is like: millions of very short, very fast, precisely timed bursts or pulses of energy, measured in nanoseconds and covering a very wide area. By varying the pulse timing accor..................[:=> Show Contents <=:]



Wideband Sigma Delta PLL Modulator


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:57:54 PM
Last Edited Or Replied at :Saturday 20th of September 2008 11:57:54 PM
Modulator , Delta, Sigma , Wideband,
d to meet high frequency offset phase noise requirements. At low frequencies or dc the modulator transfer function has a zero which will results in addition of phase noise. For that the zero is moved away from dc to a frequency equal to some multiple of fractional division ratio. This will introduce a notch at that frequency which will reduce the total quantization noise. Now the quantization noise of modified modulator is 1.7 times and 4.25 times smaller than Mash modulator.

At higher frequencies quantization noise cause distortion in the response. This is because the step size of multi bi..................[:=> Show Contents <=:]



Ultra-Wideband


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:56:16 AM
Last Edited Or Replied at :Wednesday 17th of March 2010 08:39:26 PM
Ultra Wideband , ultra wide band,
parallel interfaces to high-level serial packet interface (Serial ATA, 3GIO/PCI Express, Hyper Transport). It fosters a convergence of external and intern..................[:=> Show Contents <=:]



Wideband Sigma Delta PLL Modulator


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:57:54 PM
Last Edited Or Replied at :Saturday 20th of September 2008 11:57:54 PM
Modulator , Delta, Sigma , Wideband,
sing a phase selection divider instead of control logic in conventional modulator. This divider will produce phase shifts of VCO signal and changes the division ratio by selecting different phases from the VCO. This type of divider will produce quarter division ratios...................[:=> Show Contents <=:]



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