Cognitive energy-efficient transmission and resource allocation techniques for broadband access systems

物联网视角下无线通信的不断增长的需求和普遍部署提出了在密集异构无线接入网络中潜在的数万亿设备用大量多媒体数据淹没有限频谱资源的挑战。由于传输媒体和多媒体业务的动态性质，可重新配置和自适应方案是特别感兴趣的。此外，干扰是主要的性能限制因素，并且可以通过协调用户之间的传输和资源分配来更有效地进行干扰减轻，以协作干扰控制方式最小化相互干扰。在传输和资源分配中的用户之间的合作也可以被扩展以获得更宽的覆盖范围并减轻信道损伤，而不需要在发射机处使用大功率，从而实现系统吞吐量的实质性增益。通过认知无线电的动态频谱接入也被考虑用于更有效地使用频谱资源。这将是有益的，探索合作和认知的交叉施肥，这将成为异构无线网络中特别重要。

The growing demand and pervasive deployment of wireless communications with the perspective of Internet-of-things pose the challenge of potentially trillions of devices flooding limited spectrum resources with tremendous amounts of multimedia data in dense heterogeneous wireless access networks. Due to the dynamic nature of both transmission media and multimedia traffic, re-configurable and adaptive schemes are of particular interest. Furthermore, interference is the major performance-limiting factor and interference mitigation can be more effectively done by coordination of the transmission and resource allocation between users to minimize mutual interference in a collaborative interference control manner. Cooperation between users in transmission and resource allocation can also be extended to obtain broader coverage and to mitigate channel impairments without the need to use large power at the transmitter and hence to achieve substantial gain in system throughput. Dynamic spectrum access through cognitive radios has also been considered for more efficient use of spectrum resources. It will be beneficial to explore the cross-fertilization of cooperation and cognition, which will become especially important in heterogeneous wireless networks.