Mean Square Error Performance of OFDM Systems Against Signal to Noise Ratio under different fading Channels
The well known problem in an orthogonal frequency division multiplexing (OFDM) system is its sensitivity to frequency offset. Most of the coherent OFDM systems transmit pilot symbols on some of the subcarriers to estimate channel attenuation and also add a cyclic prefix (CP) to avoid inter carrier interference and inter symbol interference. An estimation algorithm based on the redundancy of both cyclic prefix and pilot subcarriers is proposed for the correction of frequency offset. If the frame timing is synchronized in advance, by considering the two kinds of redundancy simultaneously, the performance of the proposed hybrid algorithm achieves significant improvement under low SNR and short CP. As to high SNR and long CP, the performance of the hybrid algorithm is almost identical to that of CP-based algorithm. Some comparative simulations are given to illustrate the advantages of the proposed hybrid estimation scheme
Keywords: OFDM, Cyclic Prefix, Subcarriers, Frequency offset
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ABOUT THE AUTHORS
Haritha.Thotakura
Haritha Thotakura B.E M.Tech specialized in Microwave Engineering has 12 years of Teaching Experience. current research interests are in the fields of Wireless & Mobile Communications.
Sri Gowri .Sajja
Dr. Sajja SriGowri B.E M.Tech Ph.D has 18 years of Teaching Experience .she is presently working as Professor & Head of the Department ECE in SRK Institute of Technology, vijayawada. She got the teacher of the year award for the year 2009 from JNTU Kakinada .She executed the project under the scheme "YOUNG TEACHERS CAREER AWARD" from AICTE.She has more than 50 RESEARCH PAPERS on her credit. Her research interest include mobile communications, mobile networks & coding theory
Elizabeth Rani.D
Dr. Elizabeth Rani.D B.E M.Tech Ph.D has 20 years of Teaching Experience.. Currently working as Professor & Head of the Department EIE in GITAM Institute of Technology
Haritha.Thotakura
Haritha Thotakura B.E M.Tech specialized in Microwave Engineering has 12 years of Teaching Experience. current research interests are in the fields of Wireless & Mobile Communications.
Sri Gowri .Sajja
Dr. Sajja SriGowri B.E M.Tech Ph.D has 18 years of Teaching Experience .she is presently working as Professor & Head of the Department ECE in SRK Institute of Technology, vijayawada. She got the teacher of the year award for the year 2009 from JNTU Kakinada .She executed the project under the scheme "YOUNG TEACHERS CAREER AWARD" from AICTE.She has more than 50 RESEARCH PAPERS on her credit. Her research interest include mobile communications, mobile networks & coding theory
Elizabeth Rani.D
Dr. Elizabeth Rani.D B.E M.Tech Ph.D has 20 years of Teaching Experience.. Currently working as Professor & Head of the Department EIE in GITAM Institute of Technology
