A perspective on distributed radio systems with cooperative coding

In distributed radio systems, e.g., wireless sensor or ad-hoc networks, the system’s performance may be significantly enhanced by means of cooperation among the nodes. In this paper, we present a perspective on cooperative coding in distributed radio systems. In particular, we consider a simple reference scenario where two source nodes need to transmit two correlated information sequences to a common access point (AP). This is a scenario of interest for wireless sensor networks, where the sensor may observe correlated phenomena. Four possible cooperative-coding situations are described: (i) a non-cooperative system (NCS), (ii) cooperative source coding (CSC), (iii) cooperative source-channel coding (CSCC), and (iv) joint source-channel coding (JSCC). While in the first scheme source correlation is not used at all, the other schemes differ according to the way source correlation is used: from cooperative source coding systems, where source correlation is used only at the sources, to joint source-channel coding systems, where source correlation is used only at the access point. Indeed, joint source-channel coding systems are attractive in scenarios (such as wireless scenarios) where communications between the sources might be problematic. As an illustrative example, we will present a practical joint source-channel coding system in the presence of block-faded channels, using low-density parity-check (LDPC) coding at the sources and a proper iterative decoder at the access point.

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