Peer-Reviewed Technical Communication Adaptive Channel Estimation and Data Detection for Underwater Acoustic MIMO-OFDM Systems

In this paper, frequency and time correlation of the underwater channel are exploited to obtain a low-complexity adaptive channel estimation algorithm for multiple-input-mul- tiple-output (MIMO) spatial multiplexing of independent data streams. The algorithm is coupled with nonuniform Doppler prediction and tracking, which enable decision-directed operation and reduces the overhead. Performance is demonstrated on ex- perimental data recorded in several shallow-water channels over distances on the order of 1 km. Nearly error-free performance is observed for two and four transmitters with BCH(64,10) encoded quadrature phase-shift keying (QPSK) signals. With a 24-kHz bandwidth, overall data rates of up to 23 kb/s after coding were achieved with 2048 carriers. Good results have also been observed in two other experiments with varying MIMO-OFDM (orthogonal frequency-division multiplexing) configurations. Index Terms—Adaptive channel estimation, multiple-input- multiple-output (MIMO), nonuniform Doppler distortion, or- thogonal frequency-division multiplexing (OFDM), underwater acoustic communications.

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