| Opportunistic Source Coding for Data Gathering in Wireless Sensor Networks (2008) | |||||||||||||||
Abstract | |||||||||||||||
| Abstract—We propose a jointly opportunistic source coding and opportunistic routing (OSCOR) protocol for correlated data gathering in wireless sensor networks. OSCOR improves data gathering efficiency by exploiting opportunistic data compression and cooperative diversity associated with wireless broadcast. The design of OSCOR involves several challenging issues across different network protocol layers. At the MAC layer, sensor nodes need to coordinate wireless transmission and packet forwarding to exploit multiuser diversity in packet reception. At the network layer, in order to achieve high diversity and compression gains, routing must be based on a metric that is dependent not only on link-quality but also on compression opportunities. At the application layer, sensor nodes need a distributed source coding algorithm that has low coordination overhead and does not require the source distributions to be known. OSCOR provides practical solutions to these challenges incorporating a slightly modified 802.11 MAC, a distributed source coding scheme based on Lempel-Ziv code and network coding, and routing using a modified Dijkstra’s algorithm whose path metric condisders node compression ratios. Simulations show that OSCOR reduces the power consumption by nearly 32% compared with an existing greedy scheme in a 4 × 4 grid network. I. | |||||||||||||||
Publication details | |||||||||||||||
| |||||||||||||||