Abstract
Orthogonal frequency division multiplexing (OFDM) has many advantages, and thus has been applied to various communication systems. However, new next-generation communication systems require higher communication performance and spectral efficiency, and further studies are required to improve OFDM. Many attempts have been made to three-dimensional OFDM (3D-OFDM) in an attempt to improve OFDM. 3D-OFDM expands OFDM into three dimensions to map symbols, thereby improving communication performance, but has limitations in terms of spectral efficiency. In this paper, we present a multidimensional OFDM (MD-OFDM) system that is expanded from 3D-OFDM and evaluate its performance. Simulation results show that symbol error rate performance can be further improved when OFDM is expanded into MD-OFDM, but spectral efficiency is not improved. However, since the Euclidean distance between adjacent symbols increases with multidimensional expansion, trellis-based channel coding could be used to improve system performance and spectral efficiency. Further research is needed on these characteristics.
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