Dynamic spectrum access based on cognitive radio within cellular networks
Dynamic spectrum access based on cognitive radio within cellular networks
复制标题
蜂窝网络内基于认知无线电的动态频谱接入
DOI：
10.1109/wiad.2011.5983291
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
A. Poulton
中科院分区：
文献类型：
--
作者：
A. S. Alam;L. Dooley;A. Poulton
认知无线电（CR）中的重叠传输允许辅助系统与主系统同时使用频谱，尽管采用这种频谱共享策略带来了许多挑战，例如要求辅助用户具有作为有关主用户的辅助信息的先验知识。在本文中，提出了一种认知蜂窝网络，它使用覆盖方法通过结合认知来动态共享其无线电资源，从而增强小区容量。为了补偿重叠造成的干扰，认知基站使用鲁棒的脏纸编码并结合可变的传输功率，该功率根据移动站的位置进行设置。详细的性能分析证实了使用该技术所实现的频谱利用率的提高。
Overlay transmissions in cognitive radio (CR) permit a secondary system to use spectrum concomitantly with a primary system, though adopting this spectrum sharing strategy presents a number of challenges, such as the requirement for a secondary user to have a priori knowledge as side information about the primary user. In this paper, a cognitive cellular network is proposed which uses an overlay approach to dynamically share its radio resource by incorporating cognition, leading to enhanced cell capacity. To compensate for the interference caused by the overlay, cognitive base stations use robust dirty-paper coding in combination with variable transmission powers, which are set depending upon the location of the mobile stations. A detailed performance analysis is presented to corroborate the improved spectrum utilization achieved using this technique.