| In recent times, wireless technology has made rapid advances and emerged as a tool to provide ubiquitous connectivity. This ability to stay connected independent of geographic location, enables a variety of applications that can pervade various facets of human activity. When a set of nodes with wireless transceivers spontaneously form a network, it is called an Ad hoc network. The advantage of Ad hoc networks is that there is no need for any fixed infrastructure, or network planning. However, the energy source for the nodes is provided by batteries. This is a finite source of energy and can be a critical factor in determining the success and viability of Ad hoc networks. In this dissertation, we focus on the research of energy conserving routing in wireless Ad hoc networks.There are many approaches to combat energy constraints such as to design batteries with larger capacities, power controland so on. The approach in this paper is that the forwarding nodes are able to transmit at a lower power using2DRS coding while the receiving node can still receive the message with the required message error rate.In this paper, two description reed solomon coding(2DRS) is proposed for multi-hop multicast. Through puting the code in the minimum power multcast, nodes can receive packets which has been codede by two description codes from forwarding nodes in their receiving range. In the same requested message error rate, the total transmission power can be reduced, thereby saving the total transmission energy. The receiving and forwarding schemes are presented. In the receiving scheme, a receiving node is allowed to receive from any nodes in its sensing range. In the forwarding scheme, three problems are solved, namely node selection, code assignment and power configuration. Two different power configuration schemes were proposed, which separately were static power configuration scheme and dynamic power configuration scheme.The two power configuration schemes were simulated. After circulating several times or transmitting some date packets, the total transmission power of both power configuration schemes tended to stabilization, the performance of three cases were compared, which are Tree, Unicode,2DRS. Randomly generating20kinds of topology, which transmitting same amount of data packets seperately. After the total transmission power stabilized, sum up the average value and the average delivery rate of the20topologies. The simulation results show that2DRS coding not only save more energy than Unicode and Tree, but also provided better delivery rate. |
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