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Improper Gaussian Signaling for Multiple-Access Channels in Underlay Cognitive Radio

机译：在底层认知无线电中的多访问通道不正确的高斯信令

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摘要

This paper considers an unlicensed multiple-access channel (MAC) that coexists with a licensed point-to-point user, following the underlay cognitive radio paradigm. We assume that every transceiver except the secondary base station has one antenna and that the primary user (PU) is protected by a minimum rate constraint. In contrast to the conventional assumption of proper Gaussian signaling, we allow the secondary users to transmit improper Gaussian signals, which are correlated with their complex conjugate. When the secondary base station performs zero-forcing, we show that improper signaling is optimal if the sum of the interference channel gains (in an equivalent canonical model) is above a certain threshold. Additionally, we derive an efficient algorithm to compute the transmission parameters that attain the rate region boundary for this scenario. The proposed algorithm exploits a single-user representation of the secondary MAC along with new results on the optimality of improper signaling in the single-user case when the PU is corrupted by an improper noise.
机译：本文考虑了在底层认知无线电范例之后与许可点对点用户共存的未经许可的多址通道（MAC）。我们假设除辅基站之外的每个收发器都有一个天线，并且主用户（PU）受到最小速率约束的保护。相反，与适当高斯信令的传统假设相比，我们允许辅助用户发送不正确的高斯信号，其与其复杂的缀合物相关。当辅基站执行零强制时，如果干扰信道增益（在等效规范模型中的总和上高于某个阈值，则示出了不正确的信令是最佳的。另外，我们推出了一种有效的算法来计算实现这种情况的速率区域边界的传输参数。所提出的算法利用辅助MAC的单用户表示以及在PU噪声损坏时，在单用户案例中的不正确信令的最优信号的最优性的最佳结果。

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