Dynamic Pilot Allocation for Channel Estimation in High-Mobility OFDM Receiver

Time variations of a multipath channel in orthogonal frequency-division multiplexing (OFDM) often lead to a loss of orthogonality between the subcarriers, and thereby limit the achievable throughput. For frequency selective fast fading channels, the task of channel estimation becomes quite challenging for an OFDM system because channel response impairment appears in both frequency and time domain. This paper proposed dynamic pilot symbol assisted (PSA) channel estimation technique which provides independent estimation of the channel at each of the subcarriers in each individual OFDM symbol. The proposed approach enables a high spectral efficiency multi-carrier communication in mobile environments.