OFDM for Underwater Acoustic Communications

Appendix B

Experiment Description

B.1 SPACE08 Experiment

The Surface Processes and Acoustic Communication Experiment (abbreviated as SPACE08) was conducted at the Air-Sea Interaction Tower (ASIT) from Oct. 14 to Nov. 1, 2008, which is located in around 15 meters of water and 2 miles south of the coast of Martha's Vineyard, MA. The experiment was led by Dr. James Preisig and his team from the Woods Hole Oceanographic Institution (WHOI). Several universities and research institutions have participated in the experiment.

The acoustic source was deployed about 30 meters in a direction of 240° True from the tower, and are formed by five ITC-1007 spherical transducers. One transducer is located approximately 4 meters above the bottom on a stationary tripod, and the remaining four transducers are in a vertical array where the center-to-center spacing of transducers in the array is 50 cm and the top transducer is around 3 meters above the bottom. Any combination of the five transducers can be used for multiple-input and multiple-output (MIMO) transmissions.

As illustrated in Figure B.1, six receiving arrays are located on two paths radiating in orthogonal directions (150° and 240°) from the source at distances of approximately 60 meters, 200 meters and 1000 meters. The arrays are mounted on fixed tripods with the top element meters above the sea floor. S1 and S2 have a cross-shaped configuration ...