Methodology Of Co-Channel Interference Performance Analysis In Wireless Networks

The development of wireless communication is always with an increasingly intensified contradiction that flourishing demands of wireless services challenge the capacity of depletable resource. More and more high spectrum efficiency technologies, such as cellular networks, cognitive radio and coexistent networks, shed light on wireless communication. Meanwhile, the efficiency gain is paid by the cost of more interference, which degrades the system performance significantly. It is an open issue to establish a general framework interference analysis in various network environments. The framework aims to explain the intrinsinc connections among system parameters, and give closed or analytical expressions for interference with arbitrary parameters including channel gain, interference area, interferers'number and distribution. In this paper, a general framework is proposed to analyze both interference and system performance in various scenarios, such as self-interference in centralized network, mutual interference in distributed network and interference limited dedicated mobile system for railway. This paper comprehensively applies Fox's H function and variable, stochastic point process, probability theory, space geometry and others mathematic theory to establish system models, evaluate performance and design analysis methods. The proposed methods with low complexity explain the nature of interference and quantized dependence on system configurations. For both theoretical frameworks and practical algorithms, this dissertation demonstrates the disciplines which dominate the interference performance of wireless networks by using an analytic methodology so as to lay the foundation for wireless system design and network optimization. The main achievements are as follows.(1) An iterated method is proposed to derive the exact and closed form expressions of outage probability in the presence of multiple Nakagami-m co-channel interferers with arbitrary parameters in centralized networks. However, Nakagami-m is not suitable for all scenarios except Rayleigh, Rice, Nakagami-m, and half Gauss channels, etc. Then, a general and analytical approach is proposed to derive analytical expressions for interference and system performance over all namely fading channels in virtue of the properties of Fox's H function and variable. Considering multiple interferers with arbitrary parameters, we suggest a novel parameter-estimation method by proving lower order Fox's H function is a special case of higher order Fox's H function. The analytical solution proposed is quite general, applicable to envelop and power statistics, aggregate interference of arbitrary input and signal-to-interference ratio (SIR), distributions and high order statistics over simple and composed fading channels.(2) Interference area and distribution in distributed networks are quite different from those of centralized networks, which exert a tremendous influence on interference except channel fluctuation. This paper specifically considers the cases with single interferer and multiple interferers to distinguish the influence from interference area between interference distributions. In single interferer case, co-center and different center network models are established by considering the relative location between the service network and the interference area. In co-center scenario, a method is proposed to give closed form expressions for interference in arbitrary channels and dimension space. And in distributed network, this paper analyzes non i.i.d interference performance with Poisson point process and Bernoulli point process to model interference distribution in infinite and finite interference area, respectively.(3) A unified approach is proposed for interference limited system performance based on Fox's H method in the last chapters. And this paper applies general interference methods in centralized and distributed networks to dedicated mobile communication system for railway with linear coverage network and mobile rails consideration. And also, both analytical expressions for interference and system performance are derived for network design and optimization in railway mobile communication system.