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Page Name: An Overview of Diversity Techniques in Wireless Communication Systems


Posted by: project ideas
Created at: Friday 10th of August 2012 06:10:38 AM
Last Edited Or Replied at :Friday 10th of August 2012 06:10:38 AM
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ifferent signal copies undergo different attenuation, distortion, delays and phase shifts. Due to this problem, the overall system performance can be severely degraded.


FADING

In a typical wireless communication environment, multiple propagation paths often exist from a transmitter to a receiver due to scattering by different objects. Signal copies following different paths can undergo different attenuation, distortions, delays and phase shifts. Constructive and destructive interference can occur at the receiver. When destructive interference occurs, the signal power can be sign..................==> [ Click Here to Read More ]



Page Name: IMPLEMENTATION OF CDMA TECHNOLOGY IN CELLULAR PHONES full report


Posted by: best presentation maker
Created at: Friday 04th of June 2010 06:40:40 AM
Last Edited Or Replied at :Wednesday 20th of April 2011 03:51:02 AM
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oded data. Each bit is repeated three times. These encoded bits are called symbols. The decoder at the receiver uses a majority logic rule. Thus, if an error occurs, the redundancy can help recover the lost information. Interleaving is a simple but powerful method of reducing the effects of burst errors and recovering lost bits.
6
In the example shown here the symbols from each group are interleaved (or scrambled) in a pattern that the receiver knows.
Burst errors:
A burst error is a type of error in received digital telephone signals. Burst errors occur in clumps of adjacent symbols...................==> [ Click Here to Read More ]



Page Name: TRAFFIC CONTROL ALGORITHMS FOR A MULTI ACCESS NETWORK SCENARIO COMPRISING GPRS


Posted by: seminar topics maker
Created at: Friday 02nd of April 2010 08:55:40 AM
Last Edited Or Replied at :Friday 02nd of April 2010 08:55:40 AM
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network: for new high data rate services, an increasing number of users will subscribe to UMTS but speech and low data rate services will still be offered by both GPRS and UMTS. It is clear that providing a service by means of GPRS, which has a limited number of channels, or by means of UMTS, which has a limited Base Station power, implies differences in spectrum efficiency, which is influenced by many factors: the load of the network, the increase in the load due to the provision of that service and the available resource. Since efficiency of providing a service may differ from system to syst..................==> [ Click Here to Read More ]



Page Name: mobile communication full report


Posted by: best project report maker
Created at: Sunday 28th of February 2010 09:41:50 AM
Last Edited Or Replied at :Wednesday 06th of April 2011 01:52:57 AM
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standards outside IMT-Advanced.
3. A 4G system may upgrade existing communication networks and is expected to provide a comprehensive and secure IP based solution where facilities such as voice, data and streamed multimedia will be provided to users on an Anytime, Anywhere basis and at much higher data rates compared to previous generations

CELLULAR NETWORK

1. The idea behind cellular networks is the sub-division of a geographical area covered by a network into a number of smaller areas called cells. The frequencies allocated to one cell can be reused in other cells that are fa..................==> [ Click Here to Read More ]



Page Name: Architecture Of g Mobile Communication


Posted by: sunil.p.gowda
Created at: Monday 22nd of February 2010 11:17:11 PM
Last Edited Or Replied at :Monday 22nd of February 2010 11:17:11 PM
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Page Name: Recent trends in electronics and communication


Posted by: swathiccet
Created at: Monday 01st of February 2010 03:22:46 AM
Last Edited Or Replied at :Saturday 01st of September 2012 10:03:02 AM
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Page Name: smart antennas for wireless systems full report


Posted by: new technology thinker
Created at: Tuesday 26th of January 2010 12:19:46 PM
Last Edited Or Replied at :Friday 20th of January 2012 11:06:37 PM
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Smart Antenna
ABSTRACT
One of the most rapidly developing areas of communications is Smart Antenna systems. This paper deals with the principle and working of smart antennas and the elegance of their applications in various fields such a 4G telephony system, best suitability of multi carrier modulations such as OFDMA etc. This paper mainly concentrates on use of smart antennas in mobile communications that enhances the capabilities of the mobile and cellular system such a faster bit rate, multi use interference, space division multiplexing (SDMA), inc..................==> [ Click Here to Read More ]



Page Name: global system for mobile communication full report


Posted by: new technology thinker
Created at: Saturday 23rd of January 2010 01:31:33 AM
Last Edited Or Replied at :Friday 06th of July 2012 11:21:14 PM
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ons include traffic congestion warnings and reports on
accidents.
¢ voice mail”This service is actually an answering machine within
the network, which is controlled by the subscriber. Calls can be
forwarded to the subscriber's voice-mail box and the subscriber checks
for messages via a personal security code.
¢ fax mail”With this service, the subscriber can receive fax
messages at any fax machine. The messages are stored in a service
center from which they can be retrieved by the subscriber via a
personal security code to the desired fax number
5. GS..................==> [ Click Here to Read More ]



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