Performance Evaluation of Adaptive Equalizer in a Communication System

Mohanty, Durgesh Nandini and Mohapatra, Debashree (2009) Performance Evaluation of Adaptive Equalizer in a Communication System. BTech thesis.



This project deals with the study of the various kinds of interferences in a communication channel viz. Inter symbol Interference, Multipath Interference and Additive Interference. It deals with the design of an Adaptive Equalizer. The idea of the equalizer is to build (another) filter in the receiver that counteracts the effect of the channel. In essence, the equalizer must “unscatter” the impulse response. This can be stated as the goal of designing the equalizer E so that the impulse response of the combined channel and equalizer CE has a single spike. This can be solved using different techniques.
In this project, we have implemented an ‘Adaptive Equalizer’ using four different algorithms in Matlab. We have suggested different ways to decide the coefficients of the equalizer. The first procedure (LEAST SQUARE ALGORITHM) minimizes the square of the symbol recovery error over a block of data which can be done by using matrix pseudo inversion. The second method (LEAST MEAN SQUARE ALGORITHM) involves minimizing the square of the error between the received data values and the transmitted values which are achieved via an adaptive element. The third method (DECISION DIRECTED ALGORITHM) and the fourth method (DISPERSION MINIMIZING ALGORITHM) are used when there is no training sequence and other performance functions are appropriate.
In addition to this we have undertaken a study and realization of the Bit Error Rate of a communication system using VisSim Software.

Item Type:Thesis (BTech)
Uncontrolled Keywords:Adaptive Equalizer, Multipath Interference, Trained Least squares linear equalization,An adaptive approach to the trained equalization, Decision –Directed Linear Equalization,Dispersion- Minimizing Linear equalization, VisSim, BER Curve Control
Subjects:Engineering and Technology > Electrical Engineering > Wireless Communication
Divisions: Engineering and Technology > Department of Electrical Engineering
ID Code:302
Deposited By:Durgesh Nandini Mohanty
Deposited On:13 May 2009 09:38
Last Modified:20 Dec 2013 11:30
Supervisor(s):Das, S

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