In resource limited, large scale underwater sensor networks, cooperative communication over multiple hops offers opportunities to save power. Intermediate nodes between source and destination act as cooperative relays. Herein, protocols coupled with space-time block code (STBC) strategies are proposed and analyzed for distributed cooperative communication. Amplify-and-forward type protocols are...

The utilization of distributed control and optimization is still a challenge issue to achieve reliable communication for resource-constrained networked systems. In this paper, a distributed cooperative communication nodes control (DCCNC) approach is proposed to achieve higher reliability communication and longer network lifetime for resource-constrained wireless sensor network (WSNs). A DCCNC s...

In cooperative systems many of the obligations, prohibitions and permissions that govern the behaviour of the system exist as a result of communication with users and/or other systems. In this paper we will discuss the role of illocutionary logic and deontic logic in modelling these communication processes and the resulting norms. The combination of illocutionary and deontic logic can be used t...

The cooperative exploration problem necessarily involves communication among agents,while the spatial separation inherent in this task places fundamental limits on the amountof data that can be transmitted. However, the impact of limited communication on theexploration process has not been fully characterized. Existing exploration algorithms do notrealistically model the tra...

Both the Cooperative Computing research group at NTT and the Theory of Distributed Systems research group at MIT are carrying out research on theoretical foundations of distributed computing, with a focus on cooperative group activities in networks. Such group activities range from human social activities in cyber communities to powerful distributed applications involving data sharing and coope...

Cooperative communication allows several nodes to cooperatively transmit signals to a particular destination. Using cooperative communication, wireless networks could mitigate severe channel impairments arising from multipath propagation. In this case, the greater benefits are gained by exploiting spatial diversity in the channel. However, cooperative routing strategy in a network with multiple...

In this paper, a decode-and-forward cooperative communication system using hierarchical modulation (HM) to improve bit error probability (BER) performance is proposed. A HM symbol has high priority (HP) and low priority (LP) data streams that have different levels of BER. In the proposed scheme, all decoded symbols are treated as HP symbol by suitable design for cooperative communication. Conse...

Although multiple-input multiple-output (MIMO) is advantageous on orthogonal frequency division multiple access (OFDMA) system, it may not be possible that practical systems have more than two antennas because of size and cost. Therefore, cooperative communication has been recently proposed as a way to overcome this problem in slow fading wireless environment. However, if cooperative communicat...

Emerging cooperative MIMO communication is a promising technology in improving communication performance for wireless sensor networks. However, the security problems inherent to cooperative communications also arise. In this paper, we propose a cross-layer secured communication scheme for cooperative MIMO communication in wireless sensor networks to overcome the external and active compromised ...

For the quality of communication as multiple-input multipleoutput (MIMO), the cooperative scheme has been widely used in the wireless communication system. One of the cooperative schemes is spacetime cyclic delay diversity (STCDD). In this paper, a cooperative transmission scheme using two sources and applying STCDD is proposed. When a destination is distant from a source, the system uses two s...