標題: Window designs for DFT-based multicarrier systems
作者: Lin, YP
Phoong, SM
電控工程研究所
Institute of Electrical and Control Engineering
關鍵字: DMT;egress control;multicarrier;PSD mask;window
公開日期: 1-Mar-2005
摘要: In this paper, we consider window designs for discrete Fourier transform (DFT) based multicarrier transceivers without using extra cyclic prefix. As in previous works of window designs for DFT-based transceivers, a postprocessing matrix that is generally channel dependent, is needed to have a zero-forcing receiver. We show that postprocessing is channel independent if and. only if the window itself has the cyclic-prefixed property. We design optimal windows with minimum spectral leakage subject to the cyclic-prefixed condition. Moreover, we analyze how postprocessing affects the signal-to-noise ratio (SNR) at the receiver, which is an aspect that is not considered in most of the earlier works. The resulting SNR can be given in a closed form. Join optimization of spectral leakage and SNR are also considered. Furthermore, examples demonstrate that we can have a significant reduction in spectral leakage at the cost of a small SNR loss. In addition to cyclic-prefixed systems, window designs for zero-padded DFT-based transceivers are considered. For the zero-padded transceivers, windows that minimize spectral leakage can also be designed.
URI: http://dx.doi.org/10.1109/TSP.2004.842173
http://hdl.handle.net/11536/13929
ISSN: 1053-587X
DOI: 10.1109/TSP.2004.842173
期刊: IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume: 53
Issue: 3
起始頁: 1015
結束頁: 1024
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