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wireless communication ece comprehensive viva questions and answers

Posted by:
Created at: Friday 05th of April 2013 08:08:02 AM
Last Edited Or Replied at :Friday 05th of April 2013 08:08:02 AM
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Orthogonal Frequency Division Multiplplexing

Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:17:56 AM
Last Edited Or Replied at :Sunday 01st of March 2009 02:17:56 AM
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e initial applications were in the military communications. In the telecommunications field, the terms of discrete multi tone (DMT), multichannel modulation and multicarrier modulation (MCM) are widely used and sometimes they are interchangeable with OFDM. In OFDM, each carrier is orthogonal to all other carriers. However, this condition is not always maintained in MCM. OFDM is an optimal version of multicarrier transmission schemes.

For a large number of sub channels, the arrays of sinusoidal generators and coherent demodulators required in a parallel system become unreasonably expensive a..................[:=> Show Contents <=:]

MIMO Wireless Channels

Posted by: Computer Science Clay
Created at: Saturday 28th of February 2009 10:53:38 PM
Last Edited Or Replied at :Saturday 28th of February 2009 10:53:38 PM
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hannels, where rich scattering is almost always guaranteed.

Here we suggest a simple classification of MIMO channel and devise a MIMO channel model whose generality encompasses some important practical cases. Unlike the channel model used in , our model suggests that the impact of spatial fading correlation and channel rank are decoupled although not fully independent, which allows for example to describe MIMO channels with uncorrelated spatial fading at the transmitter and the receiver but reduced channel rank (and hence low capacity).

This situation typically occurs when the dis..................[:=> Show Contents <=:]


Posted by: computer science crazy
Created at: Saturday 21st of February 2009 01:22:15 PM
Last Edited Or Replied at :Thursday 06th of October 2011 11:02:45 PM
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ess). However, for mobile access the throughput is even lower, and depends on the mobility of the terminal. For example, the peak data rate is only 2 Mb/s for 3G systems.

Since there will be more and more need for mobile services, the poor throughput of mobile access not only limits user applications based on interconnection, but also wastes the capability of the backbone network. This case is quite similar to the traffic conditions shown in Fig. a, which is an image of an ultra-wide expressway with a few narrow entrances.

Since the little paths are rough,narrow, an..................[:=> Show Contents <=:]

Blast Wireless Download Full Report And Abstract

Posted by: computer science crazy
Created at: Saturday 21st of February 2009 01:03:46 PM
Last Edited Or Replied at :Monday 17th of February 2014 01:43:11 PM
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formation age, capacity has been the principal metric used to asses the value of a communication system. Since the existing cellular system were devised almost exclusively for telephony, user data rates low .Infact the user data were reduced to the minimum level and traded for additional users. The value of a system is no longer defined only by how many users it can support, but also by its ability to provide high peak rates to individual users. Thus in the age of wireless data, user data rates surges as an important metric.

Trying to increase the data rates by simply transmitting more; Pow..................[:=> Show Contents <=:]

Computer Science Seminar Abstract And Report 4

Posted by: computer science crazy
Created at: Sunday 15th of February 2009 02:22:13 AM
Last Edited Or Replied at :Sunday 15th of February 2009 02:22:13 AM
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e, to those which require a quantum mechanical understanding. Thus, it should not be surprising to find that the idea of quantum computation is not new. However, most if not all work so far has been understandably speculative.
Sun Spot
Sun Spot

Sun Spot (Sun Small Programmable Object Technology) is a wireless sensor network (WSN) mote developed by Sun Microsystems. The device is built upon the IEEE 802.15.4 standard. Unlike other available mote systems, the Sun SPOT is built on the Java 2 Micro Edition Virtual Machine (JVM).

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Posted by: seminar projects crazy
Created at: Friday 30th of January 2009 04:27:27 AM
Last Edited Or Replied at :Thursday 24th of March 2011 06:18:43 AM
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service or the actual television service. DBS systems are commonly referred to as mini-dish systems. DBS uses the upper portion of the Ku band. Modified DBS systems can also run on C-band satellites and have been used by some networks in the past to get around legislation by some countries against reception of Ku-band transmissions. DBS systems are generally based on proprietary transport stream encoding and/or encryption requiring proprietary reception equipment. Service providers sometimes license several manufacturers to provide equipment capable of receiving the proprietary streams. This..................[:=> Show Contents <=:]

Adhoc Networks

Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:36:21 PM
Last Edited Or Replied at :Sunday 21st of September 2008 01:36:21 PM
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hese include the power control problem. This problem infringes itself into the various layers of the OSI reference model. It basically affects the networking by affecting the battery life of the system. So the necessary solution is investigated over here, this solution being the COMPOW protocol. The second problem which we deal with is the Medium Access Control problem (MAC). The wireless medium is a shared medium hence the problem of ?who get the medium? is a big question. The basic protocol which helps us get over this control problem is the IEEE 802.11. Adhoc networks will be the future of ..................[:=> Show Contents <=:]

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