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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 communications to my mail kush..................[:=> 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 de..................[:=> 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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cellent 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 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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r of 100. OFDM can also be considered a multiple access
technique because an individual tone or groups of tone can be assigned
to different users. Multiple users share a given band with in this
manner, yielding the system called OFDMA. Each user can be assigned a
predetermined number of tones when they have information to send, or
alternatively, a user can be assigned a variable number of tones on the
amount of information that they have to send.
OFDM can be combined with frequency hopping to create a spread spectrum
system, realizing the benefits of frequency diversity a..................[:=> 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 ..................[:=> 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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ntly 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 interference. It can be considered as multiple access technique OFDMA....................[:=> 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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1.25 MHz to 20 MHz bandwidth compared with the 5MHz usage of W-CDMA. · The upload and downlink transfer rates is 50 Mbps and 100Mbps and has a spectral efficiency of 2-4 times compared to 3GPP release 6. · 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 ..................[:=> 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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evel of quantization noise is less but with multi bit O/P s quantization noise increases. So the range of stability of modulator is reduced which will results in reduction of tuning range. More over the hardware complexity of the modulator is higher than Mash modulator. In this feed back feed forward modulator the loop band width was limited to nearly three orders of magnitudes less than the reference frequency. So if it is to be used as a closed loop modulator power dissipation will increase.

So in order to widen the loop band width the close-in-phase noise must be kept within tolerable ..................[:=> 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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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.


How secure is UWB?

UWB promises to be highly secure. Itâ„¢s very difficult to filter a pulse signal out of the flood of background electronic noise with traditional RF scanners. Besides, vendors such as Time Domain are encrypting the z..................[:=> 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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use carrier wave
to transmit data.

Current radio technology - picture a guy watering his lawn with a garden hose

and moving the hose up and down in a smooth vertical motion.You can see
a continuous stream of water. Nearly all radios, cell phones, wireless
LANs and so on are like that: a continuous signal thatâ„¢s overlaid
with information by using one of several modulation techniques.

UWB technology - picture the same guy watering his lawn with a swiveling

sprinkler that shoots many, fast, short pulses of water. Thatâ„¢s
typically what UWB is like: millions of very sho..................[:=> 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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(Serial ATA, 3GIO/PCI Express, Hyper Transport). It fosters a convergence of external and internal communication technologies: in future separate components of a computer case will be combined into a normal net..................[:=> 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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ery other sub carrier. OFDM efficiently squeezes multiple modulated carriers tightly together reducing the required bandwidth.OFDM was invested in 19..................[:=> 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,
at would have a throughput capacity 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 o..................[:=> 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,
ges to wireless transceiver design. One pivotal component of transceiver is frequency synthesizer.

Two major requirements in mobile applications are efficient utilization of frequency spectrum by narrowing the channel spacing and fast switching for high data rates. This can be achieved by using fractional- N PLL architecture. They are capable of synthesizing frequencies at channel spacings less than reference frequency. This will increase the reference frequency and also reduces the PLL's lock time.

Fractional N PLL has the disadvantage that it generates high tones at multiple of channel..................[:=> 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,
t, 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 technologies such as 802.11b and short-range Bluetooth radios eventually could be replaced by UWB products that would have a throughput capacity 1,000 times greater than 802.11b (11M bit/sec). Those numbers mean UWB systems have the potential to suppor..................[:=> 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,
distortion in the r..................[:=> Show Contents <=:]



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