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首页> 外文期刊>IEEE Transactions on Communications >Statistical CSI Driven Transmit Antenna Selection and Power Adaptation in Underlay Spectrum Sharing Systems
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Statistical CSI Driven Transmit Antenna Selection and Power Adaptation in Underlay Spectrum Sharing Systems

机译：统计CSI驱动的发射天线选择和底层频谱共享系统的功率适应

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摘要

In underlay spectrum sharing, transmit antenna selection (TAS) improves the performance of a secondary system and helps it control the interference it causes to a primary system. TAS does so with a hardware complexity and cost comparable to a single antenna system. We present a novel and optimal joint TAS and continuous power adaptation rule for a practically relevant, less explored model in which the secondary transmitter knows only the statistics of channel gains from itself to one or more primary receivers. The rule minimizes the average symbol error probability (SEP) of the secondary system for an entire class of stochastic interference constraints. This general class subsumes the average interference constraint and its novel generalization, and the interference-outage constraint. We derive closed-form expressions for the transmit power and selected antenna. We then develop a general analysis of the optimal average SEP that applies to several widely-used fading models. We also present computationally-efficient approaches to determine the parameters that specify the optimal rule. Our comprehensive numerical results characterize the very different impacts of the interference constraint on both secondary and primary systems. They show that the optimal rule reduces the average SEP by two orders of magnitude compared to conventional approaches.
机译：在底层频谱共享中，发射天线选择（TAS）提高了辅助系统的性能，并有助于控制它导致主系统的干扰。 TAS具有硬件复杂性和与单个天线系统相当的成本。我们提出了一种新颖和最佳的联合TA和用于实际相关的较少探索模型的持续功率适应规则，其中次级发射机仅从一个或多个主接收器中仅知道频道增益的统计信息。该规则最小化了为整类随机干扰约束的辅助系统的平均符号误差概率（SEP）。这一普通类载有平均干扰约束及其新的泛化，以及干扰 - 中断约束。我们导出了用于发射功率和选定天线的闭合表达式。然后，我们对应用于几种广泛使用的衰落模型的最佳平均SEP进行了一般性分析。我们还提出了计算上有效的方法来确定指定最佳规则的参数。我们的综合数字结果表征了辅助和主要系统对干扰约束的影响非常不同。他们表明，与传统方法相比，最佳规则减少了两个数量级的平均SEP。

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