Huang Haining

A MAC Protocol for Underwater Acoustic Network

MAC protocol is an important problem in Underwater acoustic network. Many terrestrial wireless MAC protocol can’t work well in underwater because of long latency and limited bandwidth. In this paper, we modify the quiet duration in MACA-U using node position. The proposed MAC protocol is known as Geographical MACA(G-MACA). Simulation results in NS2 show that the throughput performance of G-MACA is much higher than that of MACA-U.

A coherent underwater acoustic communication system based on joint iterative equalization and decoding algorithm

Underwater acoustic communication is one of the key technologies in various important research fields, such as ocean geography, offshore oil industry and defense. However, conventional system design can not achieve desirable results, since the underwater channel suffers a lot from multipath propagation and Doppler Effect. In this paper, we aim to introduce a type of coherent underwater acoustic communication system, which combine the joint synchronization and equalization scheme and the joint iterative equalization and decoding technique to combat the severe underwater environment mentioned above. The platform belongs to the physical layer and can take various high layer applications. The proposed system is tested in computer simulated scenarios and experimental data, both of which demonstrate good performance.

Modularized Real-Time Communication Modem Design Based on Software Defined Radio of Underwater Acoustic Network

Demand of underwater acoustic network communications is growing faster since the development of Interest of Thing. The definition and model of underwater communication modem is presented in this paper. This paper also discusses a design method of real-time underwater acoustic communication modem based on Software-Defined-Radio and Modularization. This method includes the ideas of SDR to design universal signal processor as the core of system and modularized transmitters and receivers. The core is in all-digital mode. Transmitters, receivers, transducers with different performances and types connect to the core as blocks through the system bus. This approach has portability and compatibility to adapt to the rapid development and continuous updating of the communication system and technology. A example of this method based on dual-core DSP was implemented in the paper. Lake experiment proved the feasibility of design method.