Contents I. Introduction
Orthogonal frequency-division multiplexing(OFDM) is being widely used in wireless communications standards, such as IEEE 802.11, the multimedia mobile access communication (MMAC), and the HIPERLAN/2 because of its ability to effectively convert a frequency-selective fading channel into several nearly flat-fading channels. On the other hand, OFDM is sensitive to frequency offset which leads to inter-carrier interference (ICI), and hence performance degradation. Reference [1] discussed this kind of performance degradation, and [2] derived a maximum likelihood estimator for frequency offset. Recently, [3] examined the use of pulse-shaping to reduce the sensitivity of OFDM systems to frequency offset. In this regard, a novel pulse shape that is better in both intersymbol interference environments [4], [5] and co-channel interference environments [6] than the raised-cosine pulse has recently been reported. In this letter, we examine the employment of the novel pulse in OFDM systems. The results indicate that the new pulse outperforms rectangular and raised-cosine pulses in the reduction of average ICI power.
