An MLSE Equalizer for Cooperative Communication with Multiple Synchronous Errors

• Main Authors: Lian, Che-Sheng, 連哲聖
• Other Authors: Sang, Tzu-Hsien
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/13191943499730681128

碩士 === 國立交通大學 === 電子研究所 === 98 === In cooperative communication systems, multiple carrier frequency offsets (MCFOs) due to the varying accuracies of each node’s oscillators and different Doppler spreads may result in severe Inter-Carrier Interference (ICI), which drastically degrades the performance of BICM-OFDM systems. With proper approximation of the transmission environment, it is straightforward to obtain an equivalent channel matrix taking ICI into account. Based on the trellis structure and the fact that ICI energy is concentrated in adjacent subcarriers, we incorporate an MLSE equalizer into a turbo decoder to eliminate ICI caused by MCFOs and the Doppler effect; henceforth the full diversity is achieved, as shown in computer simulations.