TY - JOUR
T1 - Time-frequency characterization and receiver waveform design for shallow water environments
AU - Zhang, Jun Jason
AU - Papandreou-Suppappola, Antonia
AU - Gottin, Bertrand
AU - Ioana, Cornel
N1 - Funding Information:
Manuscript received July 09, 2008; accepted January 28, 2009. First published April 07, 2009; current version published July 15, 2009. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Haldun M. Ozaktas. This work was supported in part by the NSF CAREER Award CCR-0134002 and the Department of Defense Grant No. AFOSR FA9550-05-1-0443.
PY - 2009
Y1 - 2009
N2 - We investigate a frequency-domain characterization of shallow water environments based on normal-mode models of acoustic mediums. The shallow water environment can be considered as a time-dispersive system whose time-varying impulse response can be expressed as a superposition of time-frequency components with dispersive characteristics. After studying the dispersive characteristics, a blind time-frequency processing technique is employed to separate the normal-mode components without knowledge of the environment parameters. This technique is based on first approximating the time-frequency structure of the received signal and then designing time-frequency separation filters based on warping techniques. Following this method, we develop two types of receivers to exploit the diversity inherent in the shallow water environment model and to improve underwater communication performance. Numerical results demonstrate the dispersive system characterization and the improved processing performance of the receiver structures.
AB - We investigate a frequency-domain characterization of shallow water environments based on normal-mode models of acoustic mediums. The shallow water environment can be considered as a time-dispersive system whose time-varying impulse response can be expressed as a superposition of time-frequency components with dispersive characteristics. After studying the dispersive characteristics, a blind time-frequency processing technique is employed to separate the normal-mode components without knowledge of the environment parameters. This technique is based on first approximating the time-frequency structure of the received signal and then designing time-frequency separation filters based on warping techniques. Following this method, we develop two types of receivers to exploit the diversity inherent in the shallow water environment model and to improve underwater communication performance. Numerical results demonstrate the dispersive system characterization and the improved processing performance of the receiver structures.
KW - Dispersive channels
KW - Time-dispersion diversity
KW - Time-frequency analysis
KW - Time-frequency mode separation
KW - Underwater acoustic communication
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U2 - 10.1109/TSP.2009.2020363
DO - 10.1109/TSP.2009.2020363
M3 - Article
AN - SCOPUS:68249142937
VL - 57
SP - 2973
EP - 2985
JO - IEEE Transactions on Signal Processing
JF - IEEE Transactions on Signal Processing
SN - 1053-587X
IS - 8
ER -