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Code division multiple access


Posted by: abbhi_410
Created at: Tuesday 09th of February 2010 11:29:22 PM
Last Edited Or Replied at :Thursday 11th of February 2010 03:34:40 AM
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can iget allthe informa..................[:=> Show Contents <=:]



Code Division Multiple Access


Posted by: nit_cal
Created at: Friday 30th of October 2009 04:53:21 AM
Last Edited Or Replied at :Friday 30th of October 2009 04:53:21 AM
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Code Division Multiple Acce..................[:=> Show Contents <=:]



W-CDMA Wideband Code-Division Multiple Access


Posted by: computer science crazy
Created at: Friday 23rd of October 2009 05:47:24 AM
Last Edited Or Replied at :Saturday 20th of September 2014 08:51:43 AM
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ment=137]

W-CDMA (Wideband Code-Division Multiple Access), an ITU standard derived from Code Division Multiple Access, is officially known as IMT-2000 direct spread. W-CDMA is a third-generation mobile wireless technology that promises much higher data speeds to mobile and portable wireless devices than commonly offered in today's market. The present seminars discusses the applicability of WCDMA system with respect to 3G mobile system. The reason for the popularity of spread spectrum technique is addressed and the evolution of WCDMA over CDMA is also pointed out. The protoco..................[:=> Show Contents <=:]



CODE DIVISION DUPLEXING


Posted by: computer science crazy
Created at: Sunday 20th of September 2009 05:44:41 AM
Last Edited Or Replied at :Wednesday 14th of July 2010 06:25:36 AM
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is needed, the handset cost can be lower and the size of the handset smaller. Power consumption is lower due to only one single spectrum band being operable. CDD is like TDD, the ideal system for asymmetrical traffic. CDD has the highest spectrum efficiency and can be used in the new third-generation (3G) systems. The differences in TDD and CDD for cellular systems can be shown in Fig. 8. In other TDD systems the codes are not smart, so the receiver not only receives its desired code, but also receives interference (I) from other cells. Sometimes, the interference is so high it can mask the d..................[:=> Show Contents <=:]



Time Division Multiple Access


Posted by: computer science crazy
Created at: Tuesday 07th of April 2009 01:06:43 PM
Last Edited Or Replied at :Tuesday 07th of April 2009 01:06:43 PM
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opular throughout the country, and was in popular service from the early-mid 1990's up until roughly 2003 when the last of the TDMA carriers, Cingular and AT&T, switched to the GSM digital standard.

TDMA was a significant leap over the analog wireless service that was in place at the time, and it's chief benefit for carriers was that it used the available wireless spectrum much more efficiently than analog, allowing more phone calls to go through simultaneously. An additional benefit to carriers was that it virtually eliminated the criminal cell phone cloning that was popular at the time by..................[:=> Show Contents <=:]



Inverse Multiplexing


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:25:18 PM
Last Edited Or Replied at :Sunday 21st of September 2008 11:25:18 PM
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intensive applications have become common. There has always been an asymmetrical relationship between LAN and WAN bandwidth. Many organizations use 56/64 Kbps services for wide-area connectivity. Larger organizations might employ T1 WAN services, which still require LAN traffic to be significantly throttled down (to 1.544 Mbps). While T1 rates represent a significant amount of bandwidth, some organizations
may need even more. For organizations needing native LAN speeds over their WAN links, the primary alternative
has been relatively expensive T3 (45 Mbps) circuits. Similar LAN/WAN asymmetry..................[:=> Show Contents <=:]



Inverse Multiplexing over ATM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:28:42 PM
Last Edited Or Replied at :Sunday 21st of September 2008 01:28:42 PM
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rea Networks are now being used to transport voice and video traffic together with traditional data traffic that they have already supported. And in the case of voice and video applications, not only is these is a need for more bandwidth, but there is also a need for guaranteed levels of receive because these applications are very sensitive to latency and delay.
Inverse multiplexing can be proved as technology that overcomes the bandwidth gap that exists between LAN and WAN. Inverse multiplexing is exactly the opposite of traditional multiplexing. In traditional multiplexing, multiple stream..................[:=> Show Contents <=:]



Code Division Multiple Access CDMA


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:00:16 AM
Last Edited Or Replied at :Tuesday 07th of February 2012 04:35:55 AM
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me, by spreading the spectrum of their transmitted signals, so that each user's signal is pseudo-orthogonal to the signals of the other users.

CDMA Signals
In a CDMA system, each signal consists of a different pseudorandom binary sequence (called the spreading code) that modulates a carrier, spreading the spectrum of the waveform. A large number of CDMA signals share the same frequency spectrum. If CDMA is viewed in either the frequency or time domain, the multiple access signals overlap with each other. However, the use of statistically orthogonal spreading codes separates the various sig..................[:=> Show Contents <=:]



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