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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 ..................[:=> 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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he available bandwidth. The 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 becom..................[:=> 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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influence of spatial fading correlation on either the TX or the RX side of a wireless MIMO radio link has been addressed in . In practice, however, the realization of high MIMO capacity is sensitive not only to the fading correlation between individual antennas but also to the rank behavior of the channel. In the existing literature, high rank behavior has been loosely linked to the existence of a dense scattering environment. Recent successful demonstrations of MIMO technologies in indoor-to-indoor channels, where rich scattering is almost always guaranteed.

Here we suggest a simpl..................[:=> 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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om the terminal to the nearest base station, which is also a clue to solve the second problem.

However, 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..................[:=> 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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creating a huge market opportunity for wireless data access. Limited internet access, at very low speeds, is already available as an enhancement to some existing cellular systems. However those systems were designed with purpose of providing voice services and at most short messaging, but not fast data transfer. Traditional wireless technologies are not very well suited to meet the demanding requirements of providing very high data rates with the ubiquity, mobility and portability characteristics of cellular systems. Increased use of antenna arrays appears to be the only means of enabling the ..................[:=> 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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r for use with power supplies that lack the SATA power connector. Also, adaptors are available to convert a 4-pin Molex connector to SATA power connector.

External SATA

eSATA was standardized in mid-2004, with specifically defined cables, connectors, and signal requirements for external SATA drives. eSATA is characterized by:

¢ Full SATA speed for external disks (115MB/s have been measured with external RAID enclosures)
¢ No protocol conversion from PATA/SATA to USB/Firewire, all disk features are available to the host
¢ Cable length is restricted to 2m, USB and Firewire sp..................[:=> 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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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 equipment typically uses a smart card as part of the decryption system or conditional access. This measure assures satellite television providers that only authorised, paying subscribers have access to Pay TV content but at the same time can allow free-to-air (FTA) channels to be viewed eve..................[:=> 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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ch 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 I..................[:=> Show Contents <=:]



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