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Underwater wireless communication systems are becoming a priority in terms of research and technological development due to the increasing demand for exploring the oceans in areas such as pharmaceutical, oil, minerals, environmental and biodiversity. This demand is increasing exponentially with the need for high data rate and near-real-time communications. In this work an underwater low power acoustic modem to operate over tens of meters, achieving a maximum data rate of 1 Mbps, is presented. This solution allows for reprogramming the digital signal processing block enabling the use of different types of digital modulations in order to improve the modem's performance. The system is based on a poly(vinylidene fluoride) PVDF ultrasonic emitter transducer which is capable of sending high quality signals needed for digital modulations with high symbol rates per carrier period. BPSK, BFSK and OOK modulations have been tested. The results registered were 3x10 -3 BER with 1 Mbps OOK, 2.3x10-5 with 512 kbps and 1x10-8 with 256 kbps.

Compression garments has emerged as an important tool in sport activity [1, 2]. In the particular case of compression socks (CS), several studies show that their use improves the fatigue recovery and prevents muscle injuries [3-6]. The aim of this research work is to perform the characterization of sports socks regarding their comfort and compression. Several parameters were monitored in volunteers during a running test. This test was performed in a non-inclined treadmill for 12 minutes at 12km/h. PicoPress equipment was used to recording the compression force; Thermodata sensors were used to monitor the temperature and humidity; Wrist pulse oximeter was used to measure the oxygen saturation and heart rate; and thermal imaging with a TESTO IR camera was used for thermal component evaluation. Wearing compression socks seem to return better conditions for comfort, muscle stability and muscle fatigue because the main conclusions of the test show that the volunteers feel better at muscle stability (MS) and no fatigue after 24 hours of running.

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