ABSTRACT

 This paper proposes a model for three-dimensional (3-D) wireless ad hoc networks with randomly distributed nodes and unknown node locations. In this model, the nodes are assumed to be randomly distributed in a cubic torus. The distances between neighbouring nodes (hop lengths) and the distance between thesource and destination nodes (route length) are assumed to be random. In the first part of this paper, exact analytical expressions are derived for the cumulative distribution function (CDF) and the probability density function (PDF) of the hop and route lengths.Then, these distributions are used to find the average hop length,route length and number of hops analytically and numerically. The performance of the system is studied in terms of the average route bit error rate (BER) and the optimal transmit power needed to achieve a given threshold BER to maintain network connectivity. Moreover, the performance of decode-and-forward (DF) relaying scheme over Rayleigh fading channels in the presence of cochannelinterference (CCI) is studied. It is assumed that CCI is modelled as the sum of independent-not-identically distributed Rayleigh variates.

摘要

 本文提出了一个具有随机分布的节点和未知的节点位置的三维（3-D）无线ad hoc网络模型。在此模型中，假定节点随机分布在立方圆环中。假设相邻节点之间的距离（跳跃长度）和源节点与目的节点之间的距离（路由长度）是随机的。在本文的第一部分中，得出了跃点和路由长度的累积分布函数（CDF）和概率密度函数（PDF）的精确解析表达式，然后使用这些分布来查找平均跃点长度，路由分析和数值上的跃点长度和跳数。根据平均路由误码率（BER）和达到给定阈值BER来维持网络连接性所需的最佳发射功率，研究了系统的性能。此外，研究了在存在共信道干扰（CCI）的情况下，瑞利衰落信道上的解码转发（DF）中继方案的性能。假定将CCI建模为独立的，不同分布的瑞利变量之和。