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

A. Petropulu, Lun Dong, H. Poor
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引用次数: 9

Abstract

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 side lobes. 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.
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分布式无线自组织网络的高吞吐量跨层方案
在无线自组织网络中,分布式节点可以协同形成天线阵列进行远距离通信,从而实现高能效。在最近的工作中,Ochiai等人已经证明,这种协同波束形成可以实现统计上很好的波束方向图,具有窄的主瓣和低的副瓣。然而,协作过程引入了显著的延迟,因为所有协作节点都需要访问相同的信息。本文提出了一种显著降低协作开销的技术。它由两个阶段组成。在第一阶段,节点以随机访问方式进行本地传输。碰撞,当它们发生时,被看作是碰撞包的线性混合。在第二阶段,一组合作节点充当分布式天线系统,并将接收到的模拟波形波束形成一个或多个遥远的目的地。这一步需要将接收到的模拟波形乘以一个复数,该复数由每个合作节点独立计算,并允许基于最终目的地分离碰撞数据包。该方案要求每个节点具有网络坐标的全局知识。该方案可以实现高吞吐量,在某些情况下可以超过1。
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