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arXiv 0901.1936cs.ITcs.NImath.ITmath.PR
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节点位置随机的无线擦除网络容量的一个下界

A Lower Bound on the Capacity of Wireless Erasure Networks with Random Node Locations

Rayyan G. Jaber, Jeffrey G. Andrews

摘要:

在$n$节点均匀独立分布于单位面积正方形的规范情形下,以封闭形式推导了无线adhoc擦除网络容量的一个下界.这个界几乎必然成立,并且是渐近紧的。我们假设所有节点具有固定的发射功率,因此两个节点应该在彼此的指定距离$r_n$内以克服噪声。在这种情况下,干扰决定中断,因此我们将每个发射机-接收机对建模为具有广播约束的擦除信道,即每个节点只能在其所有传出链路上传输一个信号。推导了这类网络容量的$Θ(n r_n)$下界。如果广播约束是放松的,每个节点可以发送不同的信号在不同的传出链路上,我们表明,增益是$r_n$和链路擦除概率的函数,最多是一个常数,如果链路擦除概率增长足够大的$n$。最后,擦除概率本身是随机变量的情况下,例如由于随机性的几何形状或通道,进行了分析。我们证明有点令人惊讶的是,在这种情况下,擦除概率的变化增加了网络容量。

英文摘要:

In this paper, a lower bound on the capacity of wireless ad hoc erasure networks is derived in closed form in the canonical case where $n$ nodes are uniformly and independently distributed in the unit area square. The bound holds almost surely and is asymptotically tight. We assume all nodes have fixed transmit power and hence two nodes should be within a specified distance $r_n$ of each other to overcome noise. In this context, interference determines outages, so we model each transmitter-receiver pair as an erasure channel with a broadcast constraint, i.e. each node can transmit only one signal across all its outgoing links. A lower bound of $Θ(n r_n)$ for the capacity of this class of networks is derived. If the broadcast constraint is relaxed and each node can send distinct signals on distinct outgoing links, we show that the gain is a function of $r_n$ and the link erasure probabilities, and is at most a constant if the link erasure probabilities grow sufficiently large with $n$. Finally, the case where the erasure probabilities are themselves random variables, for example due to randomness in geometry or channels, is analyzed. We prove somewhat surprisingly that in this setting, variability in erasure probabilities increases network capacity.

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