smart antenna design for wireless communication using adaptive

8/2/2019 Smart Antenna Design for Wireless Communication Using Adaptive

1/13

SMART ANTENNA DESIGN FORSMART ANTENNA DESIGN FOR

WIRELESS COMMUNICATIONWIRELESS COMMUNICATION

USING ADAPTIVE BEAMUSING ADAPTIVE BEAM--

FORMING APPROACHFORMING APPROACH

-By

BHEEMESH.M(08M91A0429)And

K.RAMREDDY(08M91A0421)


2/13

OUTLINEOUTLINE::

INTRODUCTION

OBJECTIVE

BEAM-FORMING

1.TYPES

BLOCK DIAGRAM

ADVANTAGES

APPLICATIONS


3/13

INTRODUCTIONINTRODUCTION

The dramatic growth of the wireless

communication industry has resulted in searches

for new technologies to provide broader

bandwidth per user channel, better quality, and

new value-added services.

Due to drastical increase in wireless

communication system, it is necessary to

increase the Data Transmission Speed andCoverage Area.


4/13

OBJECTIVEOBJECTIVE

The smart antenna system estimates the

direction of arrival of the signal.

Current and future demands in mobile

communication for various high speedmultimedia data services entail a robust, high

data rate transmission system.

Increasing number of users per channel

motivates the research on technology to expandthe capacity and increase spectral efficiency.


5/13

At the same time, smart antennas are used in

mobile communication which occur some

problems like multipath fading, co-channel

interference and Doppler effects need to be

addressed.

Adaptive beam forming are part of recent

methods that known to offer the solution for the

abovementioned problems


6/13

BEAMBEAM--FORMINGFORMING


7/13

In Beam Forming, each user's signal is

multiplied with complex weights that

adjust the magnitude and phase of the

signal to and from each antenna.

This causes the output from the array ofantennas to form a transmit/receive

beam in the desired direction and

minimizes the output in other directions.


8/13

1.TYPES1.TYPES

Switched Beam forming: If the complexweights are selected from a library of weights

that form beams in specific, predetermineddirections, the process is called switched beam

forming.

Here, the base station basically switches

between the different beams based on thereceived signal strength measurements


9/13

Adaptive Beam forming:

If the weights are computed andadaptively updated in real time, the

process is called adaptive beam

forming. Through adaptive beam forming, the

base station can form narrower beams

towards the desired user and nulls

towards interfering users, considerablyimproving the signal-to-interference-

plus-noise ratio.


10/13

BLOCK DIAGRAMBLOCK DIAGRAM

[ W1 W2 W3 WK ]

X1

X2

X3

XK

Y

Figure 1, smart antenna concept for a receiving antenna


11/13

ADVANTAGESADVANTAGES

Reduce the multipath fading.

Inter symbol interference.

Improves convergence. Improves signal quality.

Low Cost.


12/13

APPLICATIONSAPPLICATIONS

North American cellular.

PCS systems.

Cellular radio stations.

Radars.

Broadband wireless access networks.


13/13

smart antenna design for wireless communication using adaptive

Documents