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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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ificantly diminished. This phenomenon is called fading. The performance of a system (in terms of probability of error) can be severely degraded by fading.
Very often, especially in mobile communications, not only do multiple propagation paths exist, but they are also time-varying. The result is a time-varying fading channel. Communication through these channels can be difficult. Special techniques may be required to achieve satisfactory performance.



DIVERSITY TECHNIQUES

Diversity techniques can be used to improve system performance in fading channels. Instead of transmitting ..................==> [ 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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e phone. People pause between syllables and words when they talk. CDMA takes advantage of these pauses in speech activity by using a variable rate vocoder. A CDMA vocoder varies compression of the voice signal into one of four data rates based on the rate of the user's speech activity. The four rates are: Full, 1/2, 1/4 and 1/8. The vocoder uses its full rate when a person is talking very fast. It uses the 1/8 rate when the person is silent.
5
There are two types of vocoders, 8kbps and 13kbps.The 8kbps vocoders are having high capacity but the Recently the CDMA community adopted a new 8 k..................==> [ 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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MOBILE COMMUNICATION

INTRODUCTION

1. The role of cellular phones has risen with improvement in services, reduction in service costs and the ever increasing services available through cell phones.Mobile Internet access is a global phenomenon with even great implications.Leading phone manufacturers such as Ericsson, Motorola, and Nokia have put a great deal of marketing effort behind the mobile Internet phenomenon, recognizing that adoption is a complex business proposition.
2. The most modern telephone is the cellular telephone, or commonly called a cell phone. A cellular telephone..................==> [ 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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I Need a PPT format..................==> [ Click Here to Read More ]



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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¢smartâ„¢ antenna has a higher gain than a conventional omni-directional antenna. The higher gain can
be used to either increase the effective coverage, or to increase the receiver sensitivity, which in turn can be exploited to reduce transmit power and electromagnetic radiation in the network. Decreased inter-symbol-interference (ISI) Multipath propagation in mobile radio environments leads to ISI. Using transmit and receive beams that are directed towards the mobile of interest reduces the amount of Multipath and ISI. Decreased co-channel-interference (CCI) â„..................==> [ 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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s to offer the customer cost-effective
support for centralized, regional, and local operational and
maintenance activities that are required for a GSM network. An
important function of OSS is to provide a network overview and support
the maintenance activities of different operation and maintenance
organizations.
4. GSM Subscriber Services:
There are two basic types of services offered through GSM: telephony
(also referred to as teleservices) and data (also referred to as bearer
services). Telephony services are mainly voice services that provide
subscribers with th..................==> [ Click Here to Read More ]



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