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首页> 外文会议>Information Sciences and Systems, 2009. CISS 2009 >Dynamic spatial spectrum access with opportunistic orthogonalization
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Dynamic spatial spectrum access with opportunistic orthogonalization

机译：机会正交的动态空间频谱访问

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Opportunistic spatial orthogonalization (OSO) is a new cognitive radio scheme that allows the existence of secondary users and hence increases the system throughput, even if the primary user occupies all the frequency bands all the time. Notably, this throughput advantage is obtained without sacrificing the performance of the primary user, if the interference margin is carefully chosen. The key idea is to exploit the spatial dimensions to orthogonalize users and hence minimize interference. However, unlike the time and frequency dimensions, there is no universal basis for the set of all multi-dimensional spatial channels, which motivated the development of OSO. On one hand, OSO can be viewed as a multi-user diversity scheme that exploits the channel randomness and independence. On the other hand, OSO can be interpreted as an opportunistic interference alignment scheme, where the interference from multiple secondary users is opportunistically aligned at the direction that is orthogonal to the primary user's signal space. Throughput advantages are studied both analytically and numerically.
机译：机会空间正交化（OSO）是一种新的认知无线电方案，该方案允许存在次要用户，从而提高了系统吞吐量，即使主要用户始终占据所有频带也是如此。值得注意的是，如果精心选择干扰余量，则可以在不牺牲主要用户性能的情况下获得这种吞吐量优势。关键思想是利用空间尺寸正交化用户，从而最大程度地减少干扰。但是，与时间和频率维度不同，所有多维空间信道的集合并没有统一的基础，这激发了OSO的发展。一方面，可以将OSO视为利用信道随机性和独立性的多用户分集方案。另一方面，OSO可以解释为机会干扰对齐方案，其中来自多个辅助用户的干扰在与主要用户的信号空间正交的方向上是机会对齐的。通过分析和数值研究吞吐量优势。

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