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Abstract - Differential frequency hopping (DFH) is a fast frequency hopping digital modulation scheme with proven multiple-access and jamming robustness properties in typical wireless channels. Characterizing the capabilities of DFH modulation in the more challenging underwater acoustic channel requires careful analyses that rely on both computer simulations and data collected at sea. The Sonar Simulation Toolkit (SST) is used to model challenging underwater environments and simulate the propagation of DFH waveforms in the corresponding underwater acoustic channels. Our simulations provide baseline performance results that can be used to assess the capabilities of DFH modulation and guide future algorithmic improvements to the receiver. In particular, our simulations show that incorporating equalization techniques into the DFH baseline receiver leads to improved decoding performance in challenging environments characterized by long channel impulse responses, which are known to cause inter-symbol interference in the received acoustic bit stream. To ensure their relevance to practical applications, our computer-based SST models are calibrated to the environmental parameters measured during recent at-sea experiments, including the Rescheduled Acoustic Communications Experiment (RACE08), and the corresponding performance is analyzed. BibTex - @ARTICLE{CazzantiDFHModeling2009, TITLE = Modeling differential frequency hopping communication in the underwater acoustic channel}, AUTHOR = {L. Cazzanti and J.Hsieh and D. Egnor and G. S. Edelson}, JOURNAL = {J. Acoust. Soc. Am.}, VOLUME = {125}, NUMBER = {4}, PAGES = {2581}, MONTH = {April}, YEAR = {2009}} |