Are you interested in this topic.Then mail to us immediately to get the full report.

email :-








PPT Presentation Smart Antenna



A smart antenna consists of several antenna elements, whose signal are processed adaptively in order to exploit the spatial domain of the mobile radio channel . Usually the signals received at the different antenna elements are multiplied with complex weights W and then summed up the weights are chosen adaptively not the antenna itself, but the whole antenna system including the signal processing is called "adaptive". The smart antenna technology can significantly improves wireless system performance and economics for a range of potential users. It enable operators of PC's cellular and wireless local loop networks to realize significant increase in signal quality, network capacity and coverage. In truth it is not the antenna that is smart but the antenna system are smart.

Types of Smart Antenna Systems:

Terms commonly heard today that embrace various aspects of a smart antenna system technology include intelligent antennas, phased array, SDMA, spatial processing, digital beam forming, adaptive antenna systems, and others. Smart antenna systems are customarily categorized, however, as either switched beam or adaptive array systems.The following are distinctions between the two major categories of smart antennas regarding the choices in transmit strategy:

•  Switched beam- a finite number of fixed, predefined patterns or combining strategies (sectors).

Adaptive array - an infinite number of patterns
(scenario-based ) that are adjusting in real time.

Smart Antennas for TDMA:

In a convetional time division multiple access (TDMA) or frequency division multiple access (FDMA) cellular system, carrier frequencies that are used in one cell cannot be reused in the neighboring cells, because the resulting co-channel interference would be too strong. Rather, those frequencies are reused at a greater distance. The distance (related to cell radius) between two base stations which use the same carrier frequency is named reuse distance D/R. The number of cells that have to use different carrier frequencies is called cluster size N or reuse factor. Typically, a signal-to-noise-and-interferenfe ratio (SNIR) of lODb is required for each user, resulting in a cluster size of 3 or more (N.=3) for sector cells.

Smart Antennas for TDMA (2): The increase in capacity can now be accomplished in different ways. One possibility is so-called spatial filtering for interference reduction (SFIR). Thereby, we can put base stations with the same carrier frequencies closer

It is assumed here that a smart antenna is only employed at the base station and not at the handset or subscriber unit. Such remote radio terminals transmit using omnidriectional antennas, leaving it to the base station to selectively separate the desired signals from interference selectively. Typically the received signal from the sparially distributed antenna elements is multiplied by a weight, a complex adjustment of an amplitude and a phase. These signals are combined to yield the array output. An adaptive algorithm controls the weights according to predefined objectives. For a switched beam system, this may be primarily maximum gain; for and adaptive array system, other factors may receive equal consideration. These dynamic calculations enable the system to change its radiation pattern for optimized signal reception.


You may also like this : PPT on 4g Wireless Technology,PPT on Laptop Computers,PPT Presentation Cell Phone Jammer,PPT Presentation Smart Antenna ,Pranav Mistry Sixth Sense Technology,Project Report Bluetooth Technology,RCA Smart Antnna,Reliance 4g Broadband Launch,Resistive Touch Screen,Seminar on Brain Gate,Seminar Report on Global Wireless E-Voting PDF ,Simple Mobile Jammer Circuit,Six Stroke Engine ,Six Stroke Engine Animation ,Six Stroke Engine PDF Download ,Six Stroke Engine PPT Free Download ,Six Stroke Engine PPT Presentation ,Six Stroke Engine Seminar Report Download ,Six Stroke Engine Video ,Six Stroke Engine Working ,Sixth Sense Technology,Sixth Sense Technology Open Source ,Sixth Sense Technology PDF Free Download ,Sixth Sense Technology PPT Free Download ,Sixth Sense Technology Price,Sixth Sense Technology Release,Sixth Sense Technology Seminar Report ,Sixth Sense Technology Wiki 2011 ,Sixth Sense Technology Youtube ,Smart Antenna Technology ,Smart Antenna for Converter Box ,Smart Antenna for Mobile Communication ,Smart Antenna PDF Free Download ,Smart Antenna PPT Powerpoint,Smart Antenna Seminar Report Free Download ,Smart Antenna Systems Reviews ,Smart Antenna Tutorial ,Smart Antenna TV Television ,Smart Antenna Walmart ,Sniffer for Detecting Lost Mobiles ,Sniffer for Detecting Lost Mobiles Advantages ,Sniffer for Detecting Lost Mobiles IEEE Paper,Sniffer for Detecting Lost Mobiles PDF ,Sniffer for Detecting Lost Mobiles PPT Download ,Sniffer for Detecting Lost Mobiles Presentation Slides ,Sniffer for Detecting Lost Mobiles Seminar Report ,Solar Power Satellite PPT ,Sony's Bio Battery Turns Waste Paper into Electricity ,Touch Screens Sensor Technology,Touch Screens Advantages Disadvantages


<<Back to Topics Page


copyright © 2006 V2 Computers E-mail :-