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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 infor..................[:=> 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 Multipl..................[:=> 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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ard 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 protocol architecture of WCDMA, WCDMA network architecture and the compatibilty of existing GSM s..................[:=> 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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b) during the constitution of the LS codes is determined by the polarity of the components of a Walsh-Hadamard matrix, namely by (1; 1; 1; 1) and (1;-1; 1;-1).
Fig 12: Generating the LS(N; P;W0) code using the (P * P) = (4* 4) Walsh-Hadamard matrix components (1; 1; 1; 1) and (1;-1; 1;-1). The first set of four LS codes can be generated using the first two rows of a (P * P) = (4 * 4)-dimensional Walsh-Hadamard matrix, namely using w0 = (+1; +1; +1; +1) and w1 = (+1;_1; +1;_1), as shown in Figure 12(b). Another set of four LS codes can be obtained by exchanging the subscripts 0 and 1. Finally..................[:=> 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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g 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 encrypting the signal it's wireless signal.

The primary benefit for wireless users of the era was dramatically increased call quality over the scratchy, frequently garbled or under water sounds that analog users had become accustomed to. ..................[:=> 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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For organizations with high-speed ATM LAN or backbone networks, t..................[:=> 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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data pipe, where as inverse multiplexing combines multiple circuits into single logical data pipe.
Asynchronous Transfer Mode (ATM) has compelling business as a WAN technology and is on a steep growth curve both in public carrier networks and in private organisations with requirements for networking video, voice and data traffic.
Inverse multiplexing over ATM (IMA) is a breakthrough standard that enables ???right sizing and right pricing of enterprise access solutions for organisations with low to mid range WAN traffic requirements and offers the benefits of ATMâ„¢s quality of service ..................[:=> 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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nt to a narrow-bandwidth filter. The filter allows all of the desired signal's energy to pass through, but reduces the interfering signal's energy by the ratio of the bandwidth before the correlator to the bandwidth after the correlator. This reduction greatly improves the signal-to-interference ratio of the desired signal. This ratio is also known as the processing gain. The signal-to-noise ratio is determined by the ratio of the desired signal power to the sum of all of the other signal powers. It is enhanced by the processing gain or the ratio of spread bandwidth to baseband data rate.

C..................[:=> Show Contents <=:]



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