Document Type : Articles

Authors

• A. R. ZOLGHADR ASLI ¹
• B. AMIN SHAH ²
• M. A. MASNADI SHIRAZI ¹
• M. H. GHAMAT ³

¹ Ph.D. , E. E. Dept., School of Engineering, Shiraz University, I. R. of Iran

² M.S. , E. E. Dept., School of Engineering, Shiraz University, I. R. of Iran

³ M.S. Student , E. E. Dept., School of Engineering, Shiraz University, I. R. of Iran

Abstract

One of the limitations of orthogonal frequency division Multiplexing (OFDM) in many applications is its sensitivity to frequency shifts, errors normally referred to as carrier frequency offset (CFO). Although, this small offset is negligible in conventional single carrier communication systems, it is a severe problem in the OFDM systems. Because, the carriers in OFDM are inherently closely spaced in frequency, the tolerable frequency offset becomes a very small fraction of the channel bandwidth. Besides, for OFDM communication systems, the frequency offset in mobile radio channels distorts the orthogonality between subcarriers, resulting in intercarrier interference (ICI). In this paper, we analyze and compare the performance of some already existing methods for reducing ICI with new ICI cancellation schemes by simulation. Also the advantage of using a coding scheme is shown.