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This paper investigates the performance of orthogonal frequency division multiplexing (OFDM) with $$\pi /4$$ π / 4 -differential quadrature phase shift keying ( $$\pi /4$$ π / 4 -DQPSK) modulation, over underwater acoustic (UWA) channels. The orthogonal multicarrier scheme with non-coherent detection technique results in spectrally efficient, reliable and simple receiver design...
Autonomous underwater vehicles (AUVs) are deployed in search and rescue operations where it is difficult for divers to reach. During the operation a fleet of AUVs communicate among themselves and exchange two type of information. The first includes control signal which has a low-data rate but has a very stringent bit error rate (BER) requirement and the second being the data collected by the AUVs...
Future wireless communication systems beyond 2020 will demand diverse requirements on system design that supports a wide range of data rates in overcrowded networks. This paper presents a physical (PHY)-layer system design for ultra-dense network (UDN) with multirate transmission. This proposed scheme transmits user data over highly fragmented spectrum which implies efficient spectrum utilization...
This paper evaluates the performance of differentially encoded quadrature phase shift keying (DQPSK) modulated orthogonal frequency division multiplexing (OFDM) for underwater acoustic (UWA) communication. The combination of OFDM and the non-coherent detection scheme maintains the receiver design simple, reliable and spectrally efficient. QPSK helps achieve higher data rate as two bits are sent over...
Underwater acoustic communication is essential in applications like remote control in the offshore oil industry, pollution monitoring in environmental systems, collection of scientific data recorded at ocean-bottom stations, disaster detection and early warning and underwater surveillance. Research on underwater wireless communication techniques plays a vital role in further exploring oceans and other...
There is an ever felt need to create an efficient comprehensive system to tackle natural hazards such as Tsunamis, earthquakes, landslides and floods by providing a timely early warning. Underwater wireless sensor network (UWSN) seems to be one promising solution. The success of mobile wireless communication in terms of power efficiency and reliability needs to be repeated with the UWSN for fighting...
Discrete Cosine Transform based Orthogonal Frequency Division Multiplexing (DCT-OFDM) is proposed for the first time for Underwater Acoustic Communication. Underwater acoustic channels are characterized as doubly spread channels in time and frequency. The orthogonality feature of conventional OFDM is also provided by inverse DCT (IDCT)-DCT structure with the added advantages of reduced implementation...
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