Towards Reliable Cooperative Communications in Clustered Ad Hoc Networks
Node clustering has been considered as a promising approach in ad hoc networks, where the inter cluster routing is limited to some special nodes called Cluster Head (CH). In practice, the performance of data transmission often degrades with the increase of distance between neighboring CHs. This paper proposes a new scheme that employs intermediate nodes as relays between neighboring CHs. Particularly, the authors develop both feedback and non-feedback fountain coded cooperative communications to improve reliability and robustness. It is observed that the number of relays plays a significant role in their scheme. Accordingly, they design a Rate-less Coded Relay Selection (RCRS) algorithm to guarantee the required data rate with a minimum cost.