Block-type pilot channel estimation for OFDM systems under frequency selective fading channels

Orthogonal frequency division multiplexing (OFDM) is one key technology in wireless multimedia communication. In this paper, the performance of channel estimation methods for OFDM systems based on block-type under frequency selective fading channels is discussed. Analysis of a 3G carrier model with 1 MHz bandwidth under frequency selective fading channels is made. The pilot signal estimation based on LS, MMSE, LMMSE (a simplified MMSE algorithm with low-rank approximation using singular value decomposition) criteria, and channel interpolation based on the simple linear interpolation method. Simulation indicates its good anti-multi-path performance and anti-doppler frequency shift ability.