Near optimal iterative channel estimation for KSP-OFDM

In this correspondence, we propose an iterative "turbo" channel estimation algorithm for known symbol padding (KSP) orthogonal frequency-division multiplexing (OFDM), where the guard interval is filled with pilot symbols. Additional pilot symbols are transmitted on some of the OFDM carriers. The channel estimation algorithm is based on the expectation-maximization (EM) algorithm. In the initialization phase of this iterative algorithm, the received time-domain samples are first converted to the frequency domain, and the initial channel estimate is based on the observation of the pilot carriers only. Then the EM-algorithm switches back to the time-domain and updates the channel estimates until convergence is reached. The proposed estimator performs very good: the mean square error (MSE) performance of the proposed estimator is close to the Cram

• Type: Journal
• Year: 2010
• Where: TSP
• Authors: Dieter Van Welden, Heidi Steendam
• Keywords: Additional Pilot Symbols, Artificial Intelligence, Channel Estimation Algorithm, Pilot Symbols, TSP 2010