What’s “Cooperative WSNs” ?

Given a definition from “Topology Control in Cooperative Ad Hoc Wireless Networks” of T.F. Neves, J.L. Bordim, on http://www.sciencedirect.com/science/article/pii/S1571066114000206

What is it?

Cooperative communication (CC) is a technique introduced by [19] and [26] that
allow single antenna devices to explore characteristics of MIMO systems. In coopera-
tive communication, a set of nodes transmit independent copies of the original signal.
The intended receiver obtain independent versions of the transmitted signal which
reduces the fading effect through multi-path propagation.

In this communication model, each wireless node is assumed to transmit data and to act as a cooperative
agent, relaying data from other users.

How can it be classified?

CC techniques can be classified as amplify-and-forward and decode-and-
forward [19].

In the former, a node that receives a noise version of the signal,
amplify and relay this noisy version. The receiver then combines the information
sent by both sender and relay nodes.

When decode-and-forward is employed, a relay
node must first decode the signal before retransmitting it. As the cost of a CC-link
area usually higher than conventional links, ways to select suitable nodes is usually
employed.

Among the techniques used to identify the best set of relay nodes are
received Signal-to-Noise Ratio (SNR) and/or remaining battery energy.

 

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