Full duplex techniques for 5G networks: self-interference cancellation, protocol design, and relay selection
Full duplex techniques for 5G networks: self-interference cancellation, protocol design, and relay selection
复制标题
DOI：
10.1109/mcom.2015.7105651
复制
发表时间：
2015-05
影响因子：
11.2
通讯作者：
Zhongshan Zhang;Xiaomeng Chai;Keping Long;A. Vasilakos;L. Hanzo
中科院分区：
文献类型：
--
作者：
Zhongshan Zhang;Xiaomeng Chai;Keping Long;A. Vasilakos;L. Hanzo
无线研究团体期望通过支持单个时间/频率信道中的并发发送和接收来构思全双工操作，以便与传统半双工无线系统的族相比将可达到的频谱效率提高两倍。在实现FD无线设备中遇到的主要挑战是找到用于减轻由自干扰施加的性能降级的技术。在这篇文章中，我们研究了潜在的FD技术，包括被动抑制，主动模拟消除，和主动数字消除，并强调其优点和缺点。此外，FD媒体访问控制协议设计的问题进行了讨论，以解决的问题，如所产生的端到端的延迟和网络拥塞。此外，一个机会解码和转发为基础的中继选择方案进行了分析，在独立和同分布的Rayleigh和Nakagami-m衰落信道通信的认知网络中的FD中继的上下文中。我们证明了多中继协作通信链路的中断概率可以大大降低。最后，我们讨论了上述技术所带来的挑战和一系列与实际FD实现相关的关键问题。结果表明，许多开放的挑战，如有效的SI抑制，高性能的FD MAC层协议设计，低功耗，和混合FD/HD设计，必须解决之前，成功地实现基于FD的系统。
The wireless research community aspires to conceive full duplex operation by supporting concurrent transmission and reception in a single time/frequency channel for the sake of improving the attainable spectral efficiency by a factor of two as compared to the family of conventional half duplex wireless systems. The main challenge encountered in implementing FD wireless devices is that of finding techniques for mitigating the performance degradation imposed by self-interference. In this article, we investigate the potential FD techniques, including passive suppression, active analog cancellation, and active digital cancellation, and highlight their pros and cons. Furthermore, the troubles of FD medium access control protocol design are discussed for addressing the problems such as the resultant end-to-end delay and network congestion. Additionally, an opportunistic decode-and-forward- based relay selection scheme is analyzed in underlay cognitive networks communicating over independent and identically distributed Rayleigh and Nakagami-m fading channels in the context of FD relaying. We demonstrate that the outage probability of multi-relay cooperative communication links can be substantially reduced. Finally, we discuss the challenges imposed by the aforementioned techniques and a range of critical issues associated with practical FD implementations. It is shown that numerous open challenges, such as efficient SI suppression, high-performance FD MAC-layer protocol design, low power consumption, and hybrid FD/HD designs, have to be tackled before successfully implementing FD-based systems.