非理想载波同步下OFDM 快衰落信道的稀疏与感知Sparse expression .PDF

34 9 Vol.34 No. 9 2013 9 Journal on Communications September 2013 doi:10.3969/j .issn.1000-436x.2013.09.002 OFDM , 200072 OFDM OFDM OMP OFDM OFDM TN911.7 A 1000-436X(2013)09-0010-06 Sparse expression and sensing of fast fading channel for OFDM systems with imperfect carrier synchronization FANG Yong, ZHAO Wei-jie, WANG Min (Key Laboratory of Specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China) Abstract: A sparse expression of fast fading channel and its sensing method were proposed for orthogonal fre- quency-division multiplexing (OFDM) system of sparse pilot under the condition of imperfect carrier synchroni- zation. First, a sparsified core vector based sparse expression of the generalized channel impulse response (G-CIR) was proposed by deriving compressed sensing model of the sparse pilot system. Then, both the sparsified core vector and G-CIR were reconstructed by orthogonal matching pursuit (OMP). Simulation results demonstrate that the proposed algorithm can effectively reduce the bit error rate (BER) of the OFDM system with imperfect carrier synchronization. Key words: sparse expression; compressed sensing; fast fading; OFDM; channel estimation 1 OFDM CFO LTE-A802.16 m