| With the rapid development and wide application of wireless communication technology, the newer and higher demands for communication quality of the wireless network continue to be raised, how to use the limited network resources to improve the communication quality of wireless networks has become a hot topic of current research. Wireless channel has broadcast nature,network coding can be a good play to take advantage of this feature to improve the wireless network performance. This paper mainly focus on the wireless resources optimization problem based on network coding techniques.Around the subject, this dissertation has done the following work:Firstly,this paper studies the problem of minimum cost optimization based on multiple multicast in lossy wireless networks with network coding, where delay values associated with each link and limited buffer-size of intermediate nodes are considered.The mathematical optimization model is provided and a distributed optimized algorithm for achieving minimum-cost is proposed. Simulations results are shown how the lossy hyperarcs affect the overall cost of the system and adding buffering capability at intermediate nodes may reduces the overall cost of the optimal sub-graph.Secondly, this paper address the problem of wireless rate control for multi-unicast network based on wireless Pairwise Intersession Network Coding(PINC), where the reliability of the link are considered.A rate allocation scheme As a convex optimization model with reliability considered for maximizing network utility are proposed. The proximal and gradient projection method are used to solve the problem and a distributed optimized algorithm for the problem is proposed. Simulation results show that the rate allocation with the reliability of the link under consideration will greatly enhance the overall utility of the network and PINC coding gives a good performance improvement to the network compared to no inter-session network coding. |
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