Sparse channel estimation for multicarrier underwater acoustic communication: from subspace methods to compressed sensing

Abstract--In this paper, we investigate various channel estimators that exploit channel sparsity in the time and/or Doppler domain for a multicarrier underwater acoustic system. We use a path-based channel model, where the channel is described by a limited number of paths, each characterized by a delay, Doppler scale, and attenuation factor, and derive the exact inter-carrierinterference (ICI) pattern. For channels that have limited Doppler spread we show that subspace algorithms from the array processing literature, namely Root-MUSIC and ESPRIT, can be applied for channel estimation. For channels with Doppler spread, we adopt a compressed sensing approach, in form of Orthogonal Matching Pursuit (OMP) and Basis Pursuit (BP) algorithms, and utilize overcomplete dictionaries with an increased path delay resolution. Numerical simulation and experimental data of an OFDM block-by-block receiver are used to evaluate the proposed algorithms in comparison to the conventional least-squares (LS)...

• Type: Journal
• Year: 2010
• Where: TSP
• Authors: Christian R. Berger, Shengli Zhou, James C. Preisig, Peter Willett
• Keywords: Algorithms, Artificial Intelligence, Channel Estimator, Compressed Sensing, TSP 2010