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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 COMMUNICAT..................[:=> 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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SI technology enable making of high speed chips that can perform large size FFT at affordable price.

In the 1980s, OFDM has been studied for high speed modems, digital mobile communications and high density recording. One of the systems used a pilot tone for stabilizing carrier and clock frequency control and trellis coding was implemented. Various fast modems were developed for telephone networks.
In 1990s, OFDM has been exploited for wideband data communications over mobile radio FM channels, high bit rate digital subscriber lines (HDSL, 1.6 Mb/s), asymmetric digital subscriber lines (AD..................[:=> 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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lds capacities worse than the traditional Rayleigh fading channel. Our results are validated by comparing with a ray tracing-based channel simulation. We find a good match between the two models over a wide range of situations...................[:=> 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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ated subexpressways used to provide direct entrance for distributed subscribers.The above example implies that the high-capacity wired network, being so cheap, can help us solve the problem of wireless access(too many users crowded in a very narrow bandwidth). The key issue is to provide each mobile user a direct or one-hop connection to an optical network.This structure also follows the trend in network evolution: the hierarchical or tree-like structure of traditional networks will be gradually flattened to simple single-layer ones.





PRIMARY PROBLEMS

The basic problem of wireless..................[:=> 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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ling 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

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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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the challenges that currently inhibit development of tiny sensing devices.

These changes may dramatically affect the nature and type of wireless sensor network applications.

The Sun SPOT hardware platform is a small, battery operated, wireless device running the Squawk Java Virtual Machine (VM) without an underlying OS. This VM acts as both operating system and software application platform. We have created everything from device drivers and development tools to demos and tutorials so users can quickly create their own embedded wireles appliations.

Hardware

The completely assemb..................[:=> 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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llite (DBS) also known as Direct-To-Home is a relatively recent development in the world of television distribution. ?Direct broadcast satellite? can either refer to the communications satellites themselves that deliver DBS 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 pr..................[:=> 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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stigated over here, this solution being the COMPOW protocol. The second problem which we deal with is the Medium Access Control problem (MAC). The wi..................[:=> Show Contents <=:]



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