Especificação, desenvolvimento e validação de um modem acústico para comunicação submarina

Abstract

In this paper it is presented the specification, d evel- opment and validation of an acoustic modem prototyp e for underwater communication. This work stemmed from an acoustic communication experiment which had the aim at transmitting and receiving short texts in Morse cod e by a narrowband digital channel. In this first version, the modem uses frequency shift keying (FSK) modulation/demodu lation to send/get data to/from the receiver. Before trans mission, to improve its reliability, data are coded via a convo lutional for- ward error correction (FEC) code and then interleav ed in order to reduce the distortion yielded by the communicati on channel and the burst error between successive symbols, res pectively. An recent experiment of data transmission/reception in a shal- low water communication channel has been conducted in May 2012 at Enseada dos Anjos, Rio de Janeiro, to asses s the first prototype performance.