Abstract
Cooperative transmission has been recently proposed as a promising technique to combat multi-path fading and increased link reliability. It represents a potential candidate to exploit the benefits of using multiple antennas system without requiring to implement multiple antennas per terminal. There has been extensive research investigating physical layer issues of such systems; however, higher layer protocols that exploit cooperative links in ad hoc networks are still emerging in cooperative ad hoc networks, and it is important to effectively use cooperation without affecting the performance of the network. In this dissertation, we proposed a novel a characterization of the optimal multi-hop cooperative routing in ad hoc networks, and developed a metric for both evaluation. The key advantages of cooperative links are to minimize the number of hops while maintaining the QoS requirements and to minimize the end-to-end total power for a given rate. Also we showed that energy can be used more efficiently if we determine the joint optimal packet size and the optimal power allocation for both the source and the relay. For multi-flow scenario, we have proposed a clique-based inter-flow interference abstraction, and used the linear programming formulation to study the capacity gain of ad-hoc cooperative network. It is observed that the network capacity in multi-hop multi-flow settings is severely affected by interference between links and this effect increases when the cooperative relaying is imposed.
Highlights
Wireless ad hoc networks such as home and sensor networks have become an important part of our daily life and are expected to provide multimedia services, which increases the demand for higher data rates, higher link reliability and longer battery life
We investigated the problem of routing in a multi-hop ad hoc cooperative network, with the objective of minimizing the end-to-end total power consumption while exploiting the benefit of co-operative transmission in reducing transmit power for a given rate
We addressed the feasibility of a given set of flows on an arbitrary ad-hoc cooperative network, by formulating the problem as a multi-commodity flow problem and derived the upper bound on the capacity of such networks
Summary
Wireless ad hoc networks such as home and sensor networks have become an important part of our daily life and are expected to provide multimedia services, which increases the demand for higher data rates, higher link reliability and longer battery life.
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