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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 [email protected].................[:=> 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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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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eezes 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 w..................[:=> 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 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.

Figure 1Spectrum of an OFDM Signal With Three sub-carriers
OFDM is a modulation technique that enables user data to be modulated
onto the tones. The information is a modulated into a tone by adjusting
the tones phase amplitude or both. In the most basic form, a tone may
be present or disabled to indicate a one or zero bit of information;
however, either phase shift keying..................[:=> 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..................[:=> 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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thogonal frequency Division 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. I..................[:=> 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,
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 support many more users, at much higher speeds and lower costs, than current wireless LAN systems. Current UWB devices can trans..................[:=> 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,
r sufficiently small loop bandwidth.

Wide Band PLL

For wider loop band width applications bandwidth is increased. but this will results in residual spurs to occur. this due to the fact that the requirement of the quantization noise to be uniformly distributed is violated. since we are using techniques for frequency synthesis the I/P to the modulator is dc I/P which will results in producing tones even when higher order modulators are used. with single bit O/P level of quantization noise is less but with multi bit O/P s quantization noise increases.

So the range of stability of modula..................[:=> Show Contents <=:]



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