LS Channel Estimation for Mobile OFDM Communications on Time-Varying Frequency-Selective Fading Channels

Abstract— A least-squares (LS) channel estimation (CE) technique for mobile OFDM communications over a rapidly timevarying frequency-selective fading channel is investigated in this paper. The proposed technique keeping the comb-type pilot arrangement can achieve low error probability by accurately estimating channel impulse response (CIR) and effectively tracking rapid CIR variations. In addition, the LS CE technique proposed here is conducted in the time domain (TD); meanwhile, a generic estimator is, thus, performed serially block by block without assistance from a priori channel information and without increasing computational complexity. By taking advantage of linearly frequency-modulated (LFM) or pseudorandom signals that are transceived for the purpose of sounding pilot subchannels, the proposed LS channel estimator (CE) can inherently perform pseudo-noise (PN) matched filtering (MF) to suppress multipath interference (MPI) caused by frequency-selective fading and inter-carri...

• Type: Conference
• Year: 2007
• Where: ICC
• Authors: Jia-Chin Lin
• Keywords: Communications, Frequency-selective Fading Channel, ICC 2007, LS CE Technique, LS Channel Estimator