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We consider a quasi-stationary Markov chain as a model for a decode and forward wireless multi-hop cooperative transmission system that forms successive Opportunistic Large Arrays (OLAs). This paper treats a linear network topology, where the nodes form a one-dimensional horizontal grid with equal spacing. In this OLA approach, all nodes are intended to decode and relay. We derive the transition probability...
We consider the irreducible discrete time Markov chain, with one absorbing state, as a potential candidate to model a wireless multi-hop transmission system that does cooperative transmission at every hop. This paper describes the modeling for a special geometry where the nodes are aligned on a one-dimensional horizontal grid with equal spacing and such that the cooperating clusters are adjacent....
This paper proposes a preamble detection-based cooperative transmit time pre-synchronization technique specially for Concurrent Cooperative Transmission (CCT). CCT enables a collection of power-constrained radios to transmit as a group and achieve a transmit range that is much greater than the range of a single device. In the absence of a GPS system or a globally synchronized clock, each cooperating...
In this paper, we propose a general decentralized synchronization scheme and a common error model for both frequency and time offsets in the cascaded distributed MIMO communications. By cascaded, we mean that Cluster A transmits to Cluster B, and Cluster B transmits to Cluster C, and so on, yet there is never any coordination between nodes within a cluster; for example, there is no signal redistributed...
Concurrent cooperative transmission (CCT) is a cooperative transmission (CT) technique where multiple radios transmit diversity versions of the same message at the same time. Through array gain and diversity gain, CCT achieves a signal-to-noise (SNR) advantage, which can be used for better link reliability and transmission range extension. CCT range extension can enable broadcasting with fewer hops,...
We analyze a medium access control (MAC)-free ??alternating sets?? transmission strategy for a two-dimensional strip-shaped network. This may be viewed as a broadcast strategy if the entire network has a strip shape, or it may be viewed as a unicast strategy if there is a set of pre-designated cooperators along a conventional multi-hop route, which we refer to as a cooperative route. When there are...
The opportunistic large array (OLA) is the basis for a simple cooperative transmission protocol that is suitable for broadcasting in wireless sensor networks and in which every node transmits once per broadcast. OLA with transmission threshold (OLA-T) is an energy-efficient extension of the OLA protocol that limits node participation during broadcasting. Performance of OLA-T has been studied for disc-shaped...
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