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2008
Conference Paper
Titel
Optimization of time domain windowing and guardband size for cellular OFDM systems
Abstract
OFDM signals have sidelobes in the spectrum, causing interference to the neighboring frequency channels in a cellular system. The sidelobes can be suppressed by raised cosine (RC) windowing in time domain, while the inter-cell interference can be suppressed by reserving a guardband between neighboring frequency channels. A higher roll-off factor (ROF) of the RC window leads to better sidelobe suppression and allows a smaller guardband size, increasing the spectral efficiency. However, higher ROF implies longer symbol duration and reduced data rate. Therefore, there exist a tradeoff between the ROF and the guardband size. In this paper, a joint optimization technique for the ROF and guardband size is presented, which maximizes the data rate.