Transmission capacity of spectrum sharing ad-hoc networks with multiple antennas

2011 International Symposium of Modeling and Optimization of Mobile, Ad Hoc, and Wireless Networks Pub Date : 2010-10-05 DOI:10.1109/WIOPT.2011.5930039

R. Vaze

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引用次数: 21

Abstract

Two coexisting ad-hoc networks, one primary and other cognitive, are considered, where each node of the primary network has a single antenna, while each node of the cognitive network is equipped with multiple antennas. Using multiple antennas, each cognitive transmitter uses some of its spatial transmit degrees of freedom (STDOF) to null its interference towards the primary receivers, while each cognitive receiver employs interference cancelation using some of its spatial receive degrees of freedom (SRDOF). This paper derives the optimal STDOF for nulling, and SRDOF for interference cancelation, that maximize the scaling of the transmission capacity of the cognitive network with respect to the number of antennas, when the cognitive network operates under an outage constraint at the primary receivers. With a single receive antenna, using a fraction of the total STDOF for nulling at each cognitive transmitter maximizes the transmission capacity of the cognitive network. With multiple transmit and receive antennas and fixing all but one STDOF for nulling, using a fraction of the total SRDOF to cancel the nearest interferers maximizes the transmission capacity of the cognitive network.

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多天线频谱共享自组网的传输容量

考虑两个共存的ad-hoc网络，一个主网络和另一个认知网络，其中主网络的每个节点具有单个天线，而认知网络的每个节点具有多个天线。使用多个天线，每个认知发射器使用其空间发射自由度(STDOF)来消除对主接收器的干扰，而每个认知接收器使用其空间接收自由度(SRDOF)来消除干扰。本文推导了用于消零的最佳STDOF和用于消除干扰的最佳SRDOF，当认知网络在主接收机的中断约束下运行时，最大限度地提高了认知网络的传输容量相对于天线数量的比例。对于单个接收天线，在每个认知发射机上使用总STDOF的一小部分进行零化，使认知网络的传输容量最大化。使用多个发射和接收天线并固定除一个STDOF外的所有STDOF进行零化，使用总SRDOF的一小部分来消除最近的干扰，从而最大化认知网络的传输容量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2011 International Symposium of Modeling and Optimization of Mobile, Ad Hoc, and Wireless Networks

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