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wireless communication ece comprehensive viva questions and answers


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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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:-) I NEED WIRELESS COMMUNICATION VIV..................[:=> Show Contents <=:]



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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communications 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 and complex. The receiver needs precise phasing of the demodulating carr..................[:=> 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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f MIMO technologies in indoor-to-indoor channels, 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).

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



DISTRIBUTED WIRELESS COMMUNICATION SYSTEM Download Full Report And Abstract


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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in a traditional cellular system, when the cell size gets smaller, capacity can be increased linearly with cell density. But this is based on the assumption of a large path loss exponent. Pathloss is the amount of loss introduced by the propagation environment between transmitter and receiver. When the cell size is small enough, the exponent gets small, which may be approximately 2; thus, the interference may be so large that the system may not work, as seen in Fig. 2.The above phenomenon indicates that the system capacity cannot be increased anymore when the density of cells reaches a certain..................[:=> 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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dimensions .Theoretically, user data rates as high as 2 Mb/sec will be supported in certain environments, although recent studies have shown that approaching those might only be feasible under extremely favorable conditions-in the vicinity of the base station and with no other users competing for band width. Some fundamental barriers related to the nature of radio channel as well as to the limited band width availability at the frequencies of interest stand in the way of high data rates and low cost associated with wide access.


FUNDAMENTAL LIMITATIONS IN WIRELESS DATA ACESS

Ever sin..................[:=> 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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entre and datacircles surrounding it. The technology reads databits from these datacircles by measuring the angle and distance from the bulls eye for each.

ShotCodes are designed to be read with a regular camera (including those found on mobile phones and webcams) without the need to purchase other specialised hardware. Because of the circular design, it is also possible for software to detect the angle from which the barcode is read. ShotCodes differ from matrix barcodes in that they do not store regular data - rather, they store an encoded URL which the reading device can connect to in o..................[:=> Show Contents <=:]



DIRECT BROADCAST SATELLITE DBS


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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the same time can allow free-to-air (FTA) channels to be viewed even by the people with standard equipment available in the market...................[:=> 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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tem. So the necessary solution is investigated over here, this solution being the COMPOW protocol. The second p..................[:=> Show Contents <=:]



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