New Inter-Carrier Interference Suppression Schemes For OFDM Systems

• Main Authors: Jiun-Hau Shiu, 許峻豪
• Other Authors: Ming-Xian Chang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/76093436725860100594

碩士 === 國立成功大學 === 電腦與通信工程研究所 === 93 === 　Time variations of doubly-selective channels lead to the loss of orthogonality among subcarriers, resulting in inter-carrier interference (ICI) in orthogonal frequency division multiplexing (OFDM) systems. Many schemes have been proposed to suppress ICI, but they are of hight complex , especially for large block lengths. 　An analysis of the ICI leads us to propose an ICI cancellation scheme in this thesis based on low-complexity Minimum Mean Square Error (MMSE) equalization without matrix inversion. We also propose an ICI self-cancellation scheme based on the symmetry design of signals. Both of our proposed scheme can effectively reduce the ICI effects. Computer simulation results further validate the effectiveness of our proposed schemes.