SIMO混合认知无线电系统的联合感知与接收设计
Joint Sensing and Reception Design of SIMO Hybrid Cognitive Radio Systems
摘要：
本文研究了认知无线电系统中频谱感知和接收波束形成的联合设计问题。所提出的设计的目的是最大化的可实现的平均上行链路速率的次要用户（SU），受到基于中断的服务质量（QoS）约束的主要通信。研究了一种混合CR系统方法，根据该方法，系统或者作为交织器操作（即，机会主义的）或作为投机者（即，频谱共享）CR系统，基于SS结果。一个现实的信道状态信息（CSI）框架，根据该框架，直接信道链路是已知的多天线接收机（RX），而只有统计（协方差）信息可用于干扰链路。一个新的，封闭的形式近似推导出的中断概率的主要通信，和SS参数和接收波束形成器的速率最优选择的问题是解决的混合，交织和MIMO系统。事实证明，我们提出的系统设计优于两个交织和交织CR系统的一系列系统方案。
英文摘要：
In this paper, the problem of joint design of Spectrum Sensing (SS) and receive beamforming (BF), with reference to a Cognitive Radio (CR) system, is considered. The aim of the proposed design is the maximization of the achievable average uplink rate of a Secondary User (SU), subject to an outage-based Quality-of-Service (QoS) constraint for primary communication. A hybrid CR system approach is studied, according to which, the system either operates as an interweave (i.e., opportunistic) or as an underlay (i.e., spectrum sharing) CR system, based on SS results. A realistic Channel State Information (CSI) framework is assumed, according to which, the direct channel links are known by the multiple antenna receivers (RXs), while, merely statistical (covariance) information is available for the interference links. A new, closed form approximation is derived for the outage probability of primary communication, and the problem of rate-optimal selection of SS parameters and receive beamformers is addressed for hybrid, interweave and underlay CR systems. It is proven that our proposed system design outperforms both underlay and interweave CR systems for a range of system scenarios.
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