Cooperative relaying recently emerged as a viable option for future wireless networks. By simultaneously exploiting path loss savings known from relaying scenarios and the diversity inherent to any scheme involving spatially separated transmitters, this technique is able to leverage gains from both relaying and spatial diversity techniques. In this paper, we study different cooperative relaying...

Cooperative communications among group of teleoperated unmanned ground vehicles (UGVs) allows to exploit spatial diversity in wireless fading channels by relaying signals between each other. Due to the high speed of the UGVs, the nature of the channel environments and the possible co-channel interference, the effect of multipath propagation and the Doppler spread are more pronounced. In this ar...

Cooperation schemes form a key aspect of infrastructure-less wireless networks that allow nodes that cannot directly communicate to exchange information through the help of intermediate nodes. The most widely adopted approach is based on hop-by-hop forwarding at the network layer along a path to destination. Cooperative relaying brings cooperation to the physical layer in order to fully exploit...

Synchronization of relay nodes is an important and critical issue in exploiting cooperative diversity in wireless networks. In this paper, two asynchronous cooperative diversity schemes are proposed, namely, distributed delay diversity and asynchronous space-time coded cooperative diversity schemes. In terms of the overall diversity-multiplexing (DM) tradeoff function, we show that the proposed...

In this two-part paper, the DMT of cooperative multi-hop networks is examined. The focus is on single-source single-sink (ss-ss) multi-hop relay networks having slow-fading links and relays that potentially possess multiple antennas. In this first part, some basic results that help in determining the DMT of cooperative networks as well as in characterizing the two end-points of the DMT for arbi...

Title of Dissertation: DIFFERENTIAL MODULATION FOR BROADBAND SPACE-TIME/COOPERATIVE WIRELESS COMMUNICATIONS Thanongsak Himsoon, Doctor of Philosophy, 2006 Dissertation directed by: Professor K. J. Ray Liu Department of Electrical and Computer Engineering Among various diversity techniques to combat fading in wireless channels, spatial diversity through MIMO coding scheme is an effective way to ...

This study focuses on cooperative standard setting. The empirical context is the home networking arena. This arena is characterized by rapid technological change and standards that are often supported by networks of actors. We hypothesize that the composition of these networks and the flexibility of these standards plays an important role in establishing dominance. Also, we hypothesize that net...

In the present paper, the performance of cooperative relaying networks with adaptive relaying scheme selection is analyzed. Cooperative relaying is a new technique to achieve spatial diversity gain by using neighboring stations. However, when multiple stations transmit simultaneously, the number of interference signals increases. Therefore, the introduction of cooperative relaying in radio comm...

The concepts of cooperative diversity promise to offer the benefits of spatial diversity gains to handheld wireless devices with single antennas. The information-theoretic bounds that have been established recently serve as basic guidelines; yet, the performance of such protocols should additionally be examined for more realistic assumptions. Towards this end, we study cooperative diversity pro...