Performance Improvement Of Wireless Networks Without Centralization Management Applying Dual-Antenna Mobile Transceiving Stations

Given dissertation has been written to address some important challenges that still exist practically in all wireless networks in general and in ad-hoc networks in particular, such as interference, routing, power control, and the lifetime maximization. Four contributions presented by this work are devoted to facilitate resolution of the above-mentioned issues.Application of dual-antenna stations with dynamical delay line in ad-hoc networks is the key point of this work. Dissertation gives theoretical calculations and simulations to show the efficiency of the proposed method in regard to the improvement of the network performance.Interference of electromagnetic waves is, without doubts, one of the most challenging issues in wireless networks. This problem, for example, is very urgent in cellular networks, where the lack of the frequency resources, on the one hand, and the huge number of subscribers in every cell, on the other hand, makes the works on planning the network quite sophisticated. Actually, interference in wireless networks could significantly reduce the quality of service, and partially, or even in some places completely, could break down communication link.Efficient routing in wireless networks without administration facilitates data communication between the source and destination stations, reduces the latency of packets delivery, and increases throughput of a network. This dissertation proposes application of dual-antenna stations with dynamical delay line, which are able to detect the distance from the source to the neighbor stations in order to improve existed routing algorithms by reducing the number of nodes that act as gateways during data transmission.Power control allows stations to save the energy of batteries and to prolong the lifetime of stations. It is very important, since devices applied in ad-hoc networks could be any type of mobile computing devices or communication tools, which have limited battery capacity and usually provide short range of radio propagation. At the same time, optimally chosen transmitting power level allows wireless network to reduce the negative influence of interference on the quality of signal, to improve the quality of service, and to increase the information rate due to the reduction of the negative influence of interference. In the algorithm proposed in this dissertation, power control is applied during the stage of data transmission, i.e. when the route from the source to the destination has been already discovered. Proposed method of power control is an enhanced version of the routing algorithm.Stations in wireless peer-to-peer networks are mobile and strongly restricted by the power of a battery that is why the issue of lifetime maximization of wireless peer-to-peer networks absorbs researchers’attention all over the world. Lifetime optimization of the network in this work is implemented by application of dual-antenna stations with dynamical delay line in the area of power control, which is aimed to save consuming energy of batteries by decreasing the number of intermediate nodes that act as gateways during data transmission.This work introduces the zoning method-method of optimization of the number of sectors and annular zones that divide the range of operation of the station in order to improve routing and energy savings issues.