Energy aware QoS assurances in wireless ad hoc networks

Next generation wireless ad hoc networks must provide Quality of Service (QoS) for diverse applications. Challenges in such networks include limited bandwidth, shared wireless medium, dynamic nature of wireless networks, and limited energy resource on each mobile node.;New physical layer technologies that increase the spatial reuse of the wireless medium can alleviate some of these challenges and provide opportunities to improve network performance. More powerful computing hardware on mobile nodes (MNs) also provides the opportunity to implement more sophisticated schemes. The main goal of the proposed research is to develop schemes that meet the QoS needs of applications with considerably less energy consumption by exploiting these new technologists. Both unicast and multicast communication are considered in this research.;For unicast communication, a new physical layer scheme that allocates transmit power and multiple spreading codes is presented. The scheme can meet the QoS needs of MNs and maximize the total network throughput.;Problems in multicast are described as finding minimum energy schemes while meeting the required Packet Error Rate (PER). Two techniques are used to solve the problem. The first technique uses multiple-description coding to minimize total transmit power in the network layer. Receiving scheme and forwarding scheme are presented. The second technique uses adaptive antenna arrays on the MNs. Two sets of physical layer and Media Access Control (MAC) layer schemes are proposed to conserve transmit power and increase spatial reuse.