Georgian Electronic Scientific Journal: Computer Science and Telecommunications 2007|No.1(12)
14
Configuration of OFDM Transmission Techniques- Based On Algorithms Developed
Using Concept of UML and Matlab
1RAJESH GOEL, 2Dr. P.K.BANSAL
1Department of ECE, Ambala College of Engineering and Applied Research, P.O. Sambalkha, Ambala. (133101)
India. Phone-+91-9416613113. ecedept2003@yahoo.com
2Principal, Malout Institute of Management and Information Technology, Malout(Punjab), India.
pkbmimit@yahoo.com
Abstract:This paper proposes the algorithm using concept of UML (Unified
Modeling Language) through Matlab, for OFDM (Orthogonal Frequency Division
Multiplexing) based system on pilot arrangement. The channel estimation based on pilot
symbol has been proposed for estimating channel at pilot frequencies and interpolating
the channel. Real time UML can be helpful for developing efficient objects for
embedded systems. This paper proposes, using UML constructor, the configuration of
an OFDM transmitter and receiver. The broadband WLAN system of the future, using a
pilot symbol-assisted OFDM transmission system have been proposed and simulated.
These (Pilot symbols) have been inserted at a known period and at the receiver the
channel characteristics for every symbol have been estimated for recovering the
transmitted data.
Keywords: UML, Orthogonal Frequency Division Multiplexing (OFDM), ISI, Channel
Estimation.
1 INTRODUCTION
A mobile radio channel is characterized by a multipath fading environment. These reflected
delayed waves interfere with the direct wave and cause intersymbol interference (ISI), which
causes significant degradation of the network performance. A wireless network must be designed in
such a way as to minimize these adverse effects. For broadband multimedia mobile communication
systems, it is necessary to use high bit rate transmission of at least several megabits per second.
However, if digital data are transmitted at a rate of several megabits per second, the de