DESIGN AND IMPLEMENTATION OF UNDERWATER ACOUSTIC MODEM USING FREQUENCY SHIFT KEYING (FSK) MODULATION WITH BIT RATE VALUE VARIATION
Underwater communication is a technology that uses sound or acoustic waves and uses water as its propagation medium. Most of the development of this technology uses acoustic signals compared to radio frequencies or optic. Communication systems using acoustic have the advantage of long distance under...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/31016 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Underwater communication is a technology that uses sound or acoustic waves and uses water as its propagation medium. Most of the development of this technology uses acoustic signals compared to radio frequencies or optic. Communication systems using acoustic have the advantage of long distance underwater data transmission. However, underwater communication devices or underwater acoustic modems are currently controlled by imported commercial devices, which have a high price. Some modulation schemes of underwater acoustic modems that have been used by researchers are FSK, ASK, PSK, DSSS, OFDM and others. From this modulation scheme, many researchers use FSK modulation because of its simple design. However, FSK modulation has a weakness, which has a slow bit rate when compared with other modulation schemes <br />
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In this research have been designed underwater acoustic modem using FSK modulation with bit rate value variation. Modem design uses components that are cheap and available on the market. So hopefully it can produce underwater acoustic modems with low cost suitable for short range underwater sensor network applications. <br />
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FSK modem testing with different bit rate variations has been successfully performed. The FSK modems are tested from bit rates of 1200 bps, 2400 bps, and 4800 bps. From the test results, it is found that the variation in the bit rate value shows the effect on the error. And from the bit error rate analysis (BER) shows that scenario 1 with bit rate of 1200bps has the smallest BER value of 0%. Scenario 2 with bit rate of 2400bps has a BER value 0% to 7%. Scenario 3 with bit rate of 4800bps has the highest BER value compared to other scenario, from 25% to 40%. |
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