Transmission capacity of wireless ad hoc networks with successive interference cancellation
Transmission capacity of wireless ad hoc networks with successive interference cancellation
复制标题
DOI：
10.1109/tit.2007.901153
复制
发表时间：
2007-08-01
影响因子：
2.5
通讯作者：
de Veciana, Gustavo
中科院分区：
文献类型：
--
作者：
Weber, Steven P.;Andrews, Jeffrey G.;de Veciana, Gustavo
无线自组织网络的传输容量（TC）被定义为使得中断概率不超过某个指定阈值的成功传输的最大空间强度。这项工作研究的改进TC可获得连续干扰消除（SIC），一个重要的接收机技术，已被证明可以实现几个类的多用户信道的容量，但尚未仔细评估的上下文中的ad hoc无线网络。本文开发了封闭形式的上限和易于计算的下限的TC与SIC接收器的ad hoc网络，完美和不完美的SIC。该分析适用于任何多用户接收机，该接收机通过因子z消除K个最强干扰信号，因子z是[0，1]的元素。除了提供第一个封闭形式的能力结果SIC在ad hoc网络中，设计相关的见解成为可能。特别是，它表明，SIC应使用直接序列扩频。此外，干扰消除中的任何缺陷都会迅速降低其有用性。更令人惊讶的是，只有几个（通常只有一个）干扰节点需要被取消，以获得绝大多数可用的性能增益。
The transmission capacity (TC) of a wireless ad hoc network is defined as the maximum spatial intensity of successful transmissions such that the outage probability does not exceed some specified threshold. This work studies the improvement in TC obtainable with successive interference cancellation (SIC), an important receiver technique that has been shown to achieve the capacity of several classes of multiuser channels, but has not been carefully evaluated in the context of ad hoc wireless networks. This paper develops closed-form upper bounds and easily computable lower bounds for the TC of ad hoc networks with SIC receivers, for both perfect and imperfect SIC. The analysis applies to any multiuser receiver that cancels the K strongest interfering signals by a factor z is an element of [0, 1]. In addition to providing the first closed-form capacity results for SIC in ad hoc networks, design-relevant insights are made possible. In particular, it is shown that SIC should be used with direct sequence spread spectrum. Also, any imperfections in the interference cancellation rapidly degrade its usefulness. More encouragingly, only a few-often just one-interfering nodes need to be canceled in order to get the vast majority of the available performance gain.