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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 se..................[:=> 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 detail..................[:=> 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 every other sub carrier. OFDM efficiently squeezes multiple modulated carriers tightly together reducing the required bandwidth.OFDM was i..................[:=> 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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technique that divides the spectrum into a number of equally spaced
tones and carries a portion of a users information on each tone. A tone
can be thought of a frequency, much in the same way that each key on a
pain represents unique frequency. OFDM has a special property that each
tone is orthogonal with each other. There will be frequency guard bands
b/w frequencies so that they do not interfere with each other. OFDM
allows the spectrum of each tone to overlap and because they are
orthogonal they donot interfere with each other. This reduces the
required spectrum.
..................[:=> Show Contents <=:]



Adaptive Multipath Detection34


Posted by: juleehelenmathew
Created at: Tuesday 24th of November 2009 02:39:10 AM
Last Edited Or Replied at :Saturday 28th of March 2015 08:47:58 AM
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i want details and abstract of this t..................[:=> 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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Multiplexing (OFDM) is multicarrier transmission technique. OFDM is a communication technique that 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..................[:=> 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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· When compared with W-CDMA. Has a better latency time of around 20ms for round trip time from user terminal to RAN which is same as of a combined 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 t..................[:=> 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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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 bit modulator is same as single bit modulator. So more phase distortion will be occurring in multi bit PLLs. To reduce quantization noise at high frequencies the step size is reduced by producing functional division ratios. This is achieved by using 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 di..................[:=> 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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n, Multispectral Solutions, Aether Wire, Fantasma Network, IBM, Intel and Motorola.

UWB was also used in espionage agencies in both the United States of America and the former Soviet Union. The research of military radar technicians led to the Ëœultra wideband synthetic aperture radarâ„¢, used by spy planes and satellites to see through dense ground cover to locate enemy troops and camouflaged equipment on the ground. It works by showering the target with rapid pulses of broad, low frequency signals that punch their way through solid objects. UWB works in a similar fashion.


H..................[:=> 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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. UWB doesnâ„¢t suffer from multi-path interference (where
signals reach the receiver after traveling through two or more paths).
Hence, it can be used in densely built-up places, or where number of
users are more than what is supported b..................[:=> 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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nology to be preferred.

Internal wired channels are switching ..................[:=> 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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cation. It is extremely efficient in mitigating common problems in high-speed communication such as 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,
apacity 1,000 times greater than 802.11b (11M bit/sec). Those numbers mean UWB systems have the potential to support many more users, at much higher speeds and lower costs, than current wireless LAN systems. Current UWB devices can transmit data up to 100 Mbps, compared to the 1 Mbps of Bluetooth and the 11 Mbps of 802.11b. Best of all, it costs a fraction of current technologies like Blue-tooth, WLANs and Wi-Fi.

The concepts of communication and computation are so close that their tight connection is obvious even for PR departments of major IT companies. Quite often it makes no sense to se..................[:=> 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,
sadvantage 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 loop modulator for digital enha..................[:=> 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,
ommunication channels. The communication channels include internal:

caches
system buses
memory interfaces
interfaces of storage devices
...and external:
interfaces of peripherals
wireless network channels
wired network channels
structures of data transfer.

External wired communication channels are developing mainly in two directions - cost reduction and increase of availability of optical channels (top-down) and growth of throughput (bottum-up). However, the two physical carriers are not so close yet (first of all, in prices) to be involved in direct compe..................[:=> 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,
-phase noise must be kept within tolerable levels and also the rise of the quantization noise must be limited 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 highe..................[:=> Show Contents <=:]



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