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arXiv 0704.2841cs.ITmath.IT
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一种高吞吐量的分布式无线Ad Hoc网络跨层方案

A High-Throughput Cross-Layer Scheme for Distributed Wireless Ad Hoc Networks

Athina P. Petropulu, Lun Dong, H. Vincent Poor

摘要:

在无线自组织网络中,分布的节点可以协作形成天线阵列进行远距离通信,以实现高能量效率。在最近的工作中,Ochiai等人,已经表明这种协作波束形成可以实现具有窄主瓣和低旁瓣的统计上良好的波束图案。然而,协作的过程引入了显著的延迟,因为所有的协作节点需要访问相同的信息。在本文中,提出了一种技术,显着降低了协作开销。它包括两个阶段。在第一阶段中,节点以随机接入方式在本地发送。碰撞,当它们发生时,被视为碰撞的数据包的线性混合。在第二阶段中,一组协作节点充当分布式天线系统,并将接收到的模拟波形波束成形到一个或多个遥远的目的地。该步骤需要将接收到的模拟波形乘以复数,该复数由每个协作节点独立计算,并且使得能够基于冲突的分组的最终目的地来分离冲突的分组。该方案要求每个节点具有网络坐标的全局知识。所提出的方案可以实现高吞吐量,在某些情况下超过1。

英文摘要:

In wireless ad hoc networks, distributed nodes can collaboratively form an antenna array for long-distance communications to achieve high energy efficiency. In recent work, Ochiai, et al., have shown that such collaborative beamforming can achieve a statistically nice beampattern with a narrow main lobe and low sidelobes. However, the process of collaboration introduces significant delay, since all collaborating nodes need access to the same information. In this paper, a technique that significantly reduces the collaboration overhead is proposed. It consists of two phases. In the first phase, nodes transmit locally in a random access fashion. Collisions, when they occur, are viewed as linear mixtures of the collided packets. In the second phase, a set of cooperating nodes acts as a distributed antenna system and beamform the received analog waveform to one or more faraway destinations. This step requires multiplication of the received analog waveform by a complex number, which is independently computed by each cooperating node, and which enables separation of the collided packets based on their final destination. The scheme requires that each node has global knowledge of the network coordinates. The proposed scheme can achieve high throughput, which in certain cases exceeds one.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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