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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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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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(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 carriers and sampling times in order to keep crosstalk between sub channels acceptable. Weinstein and Ebert applied t..................[:=> 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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nels, where Nmin is the minimum of the number of TX and RX antennas. Under certain propagation conditions capacity gains proportional to Nmin can be achieved . Space-time coding and spatial multiplexing (a.k.a. \BLAST) are popular signal processing techniques making use of MIMO channels to improve the performance of wireless networks.

Previous work and open problems. The literature on realistic MIMO channel models is still scarce. For the line-of-sight (LOS) case, previous work includes . In the fading case, previous studies have mostly been conned to i.i.d. Gauss..................[:=> 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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n it.


In telecommunications, the optical fiber network (expressway) is relatively much cheaper than the wireless spectrum (little paths), while the capability of the former is much greater than that of the later. As shown in Fig. b, besides the backbone expressway, there are some dedicated 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 d..................[:=> 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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tation arrays is becoming universal it is really the simultaneous deployment of base station and terminal arrays that can unleash unprecedented levels of performance by opening up multiple spatial signaling 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..................[:=> 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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the two. The seemingly large number of pins are used to supply three different voltages if necessary ” 3.3 V, 5 V, and 12 V. Each voltage is supplied by three pins ganged together (and 6 pins for ground). This is because the small pins cannot supply sufficient current for some devices, so they are combined. One pin from each of the three voltages is also used for hotplugging. The same physical connections are used on 3.5-in (90mm) and 2.5-in (70mm) (notebook) hard disks. Some SATA drives include a PATA-style 4-pin Molex connector for use with power supplies that lack the SATA power conn..................[:=> 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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S 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 even by the people with standard equipment availab..................[:=> 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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