Cooperative relay techniques for cognitive radio systems: Spectrum sensing and secondary user transmissions
Cooperative relay techniques for cognitive radio systems: Spectrum sensing and secondary user transmissions
复制标题
DOI：
10.1109/mcom.2012.6178840
复制
发表时间：
2012-04
期刊：
影响因子：
--
通讯作者：
Yulong Zou;Yu-dong Yao;B. Zheng
中科院分区：
文献类型：
--
作者：
Yulong Zou;Yu-dong Yao;B. Zheng
认知无线电是一项很有前途的技术，它使未经许可的用户（也称为认知用户）能够识别许可频段的空白（称为频谱洞），并利用检测到的频谱洞进行数据传输。要设计一个可靠、高效的认知无线电系统，有两个基本问题：设计一种准确、鲁棒的频谱感知算法，尽可能准确地检测频谱空洞；为认知用户设计二次用户传输机制，尽可能高效地利用检测到的频谱孔。本文研究并表明，协同中继技术对频谱感知和二次传输这两个问题有显著的好处。总结了合作中继在频谱感知中的应用研究现状，并提出了相关的潜在挑战。我们讨论了在主用户服务质量（QoS）约束下，在二次传输中使用合作中继的问题，并为此提出了分集-复用折衷方案。此外，本文还综合考虑了认知无线网络中的频谱感知和二次传输，提出了一种带有合作中继的认知传输的权衡设计。
Cognitive radio is a promising technology that enables an unlicensed user (also known as a cognitive user) to identify the white space of a licensed spectrum band (called a spectrum hole) and utilize the detected spectrum hole for its data transmissions. To design a reliable and efficient cognitive radio system, there are two fundamental issues: to devise an accurate and robust spectrum sensing algorithm to detect spectrum holes as accurately as possible; and to design a secondary user transmission mechanism for the cognitive user to utilize the detected spectrum holes as efficiently as possible. This article investigates and shows that cooperative relay technology can significantly benefit the abovementioned two issues, spectrum sensing and secondary transmissions. We summarize existing research about the application of cooperative relays for spectrum sensing (referred to as the cooperative sensing) and address the related potential challenges. We discuss the use of cooperative relays for the secondary transmissions with a primary user's quality-of-service (QoS) constraint, for which a diversity-multiplexing trade-off is developed. In addition, this article shows a trade-off design of cognitive transmissions with cooperative relays by jointly considering the spectrum sensing and secondary transmissions in cognitive radio networks.