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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 mo..................[:=> 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 ..................[:=> 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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at 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 mitigating common problems in high-speed communication such as multipath fading and RF noise 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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the benefits of frequency diversity and interference
averaging property. In frequency hopping spread spectrum system, each
usersâ„¢ set of tones is changed after each time period. By switching
frequencies after each symbol time, the losses due to frequency
selective fading are minimized.OFDM therefore provides the best of the
benefits of TDMA in that users are orthogonal to one another and CDMA-
while avoiding the limitations of each including the need for TDMA
frequency planning and multiple access interference in the case of
CDMA.
W-OFDM SYSTEM ARCHITECTURE

F..................[:=> 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 ..................[:=> 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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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 mitigating common problems in high-speed communication such as multipath fading and RF noise interference. It can be considered as multiple access ..................[:=> 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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s super 3G can be said as the successor of HSDPA and HSUPA technologies specified in 3GPP releases 5 and 6. This expected fraction of 3GPP s Long Term Evolution (LTE) upgrade path for UMTS systems has given a totally different air interface system with that of the W-CDMA. The characteristics of HSOPA includes -: · Utilizes 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 laten..................[:=> 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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less standards such as GPRS and HSCSD have brought new challenges 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 PLLâ„¢s lock time.

Fractional N PLL has ..................[:=> 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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multiple propagation paths (multipath), with different time delays, gives rise to complex, time-varying transmission channels. A line-of-site path between the transmitter and receiver seldom exists in indoor environments, because of natural or man-made blocking, and one must rely on the signal arriving via multipath.

UWB gives us these extremely high data rates at lower costs and lower levels of power consumption, which makes it ideally suitable for handhelds and mobiles.

What is Ultra Wideband technology?
Ultra Wideband is a revolutionary wireless technology for transmitting digita..................[:=> 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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rlaid
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 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.

Advantages “ Current UWB devices can transmit data up to 100
Mb..................[:=> 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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he digital building blocks of modern information systems. It uses low-energy and extremely short duration (in the order of pico seconds) impulses or bursts of RF (radio frequency) energy over a wide spectrum of frequencies, to transmit data over short to medium distances, say about 15-100 m. It doesn't use carrier wave to transmit data.

UWB is fundamentally different from existing radio frequency technology. For radios today, 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 in an undulati..................[:=> 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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nication 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 mitigating common problems in high-speed communication such as multipath fading and RF noise interference. It can be..................[:=> 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,
s 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 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). Thos..................[:=> 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,
such as GPRS and HSCSD have brought new challenges 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..................[:=> 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,
cessors and growing throughput of their communication 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, ..................[:=> 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,
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 bit modulato..................[:=> Show Contents <=:]



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