Underwater Acoustic Micromodem for Underwater Internet of Things

Table 1

Parameters of proposed modem and state-of-the-art methods.

Underwater acoustic modem	Processing	Price ($)	Dimension (mm)	Modulation	Frequency band (kHz)
Proposed	MCU	ca. 500		FH–MFSK	35-45
Commercial devices
Tritech Micron Modem	n.a.	ca. 19000		n.a.	20-28
Sonardyne modem 6 submini	n.a.	ca. 15000		n.a.	21-31.5
Teledyne benthos ATM-964	n.a.	ca. 20000		PSK	9-27
LinkQuest UWM2000	n.a.	ca. 24000		n.a.	26.77-44.62
DSPComm Aquacomm Gen2	DSP	ca. 15000		DSSS/OFDM	16-30
EvoLogics S2CT 42/65	FPGA	ca. 25000		n.a.	42-65
Devices developed by research groups
[9]	PC	n.a.	n.a.	FSK	14-17.5
[10]	MCU	n.a.		Chirp-BOK	24-32
[11]	MCU	n.a.	n.a.	n.a.	n.a.
[12]	Arduino	n.a.	n.a.	s	n.a.
[13]	MCU	n.a.	(board)	n.a.	n.a.
[14]	MCU	n.a.	n.a.	FSK	20-40
[15]	MCU	ca. 600		FSK, OFDM	25-87.5
[16]	MCU	n.a.		MC–MFSK	20-30