Spectral-Efficient Cellular Communications With Coexistent One- and Two-Hop Transmissions
Spectral-Efficient Cellular Communications With Coexistent One- and Two-Hop Transmissions
复制标题
具有共存一跳和两跳传输的频谱高效蜂窝通信
DOI：
10.1109/tvt.2015.2472456
复制
发表时间：
2016-08-01
影响因子：
6.8
通讯作者：
Yang, Luxi
中科院分区：
文献类型：
--
作者：
Li, Chunguo;Liu, Peng;Yang, Luxi
本文研究了一跳直接传输和两跳中继共存的蜂窝通信场景。与传统的蜂窝系统不同，传统的蜂窝系统具有正交信息流，通过解耦的信道资源（例如，时分）提供服务，我们提出了一种新的协议，其中两个信息流通过共享信道资源同时提供服务，从而构成了蜂窝通信的频谱高效解决方案。然而，另一方面，所提出的协议不可避免的一个问题是交互干扰，这可能导致两个信息流的严重恶化。为了解决这个问题，我们开发了一种基于窃听的协议，该协议在接收器设计中利用偷听干扰作为有用的侧信息。具体而言，根据干扰水平，开发了一种利用直接移动终端偷听干扰的自适应线性最小均方误差（MMSE）和非线性MMSE连续干扰消除（SIC）接收机。为了平衡这两种信息流，我们开发了高功率状态下基站（BS）的渐近最优叠加编码。在有限功率约束下，求出了使两个信息流可达速率瓶颈最大化的最佳中继波束形成矩阵。最后，仿真结果表明，与传统的蜂窝系统相比，该系统具有显著的吞吐量增益。
The cellular communications scenario involving the coexistence of the one-hop direct transmission and the two-hop relaying is studied in this paper. In contrast to conventional cellular systems featuring orthogonal information flows served by decoupled channel resources via, e.g., time division, we propose a novel protocol in which two information flows are served simultaneously via the shared channel resource, thus constituting a spectral-efficient solution for cellular communications. On the other hand, however, an inevitable issue associated with the proposed protocol is the interflow interference, which may lead to serious deterioration on both information flows. To tackle this issue, we develop an overhearing-based protocol that utilizes the overheard interference as useful side information in the receiver design. Specifically, depending on the interference levels, an adaptive linear minimum mean squared error (MMSE) and nonlinear MMSE successive interference cancellation (SIC) receiver exploiting the overheard interference at the direct mobile terminal is developed. To balance between the two information flows, we develop the asymptotically optimum superposition coding at the base station (BS) in the high-power regime. Furthermore, the optimum relay beamforming matrix maximizing the bottleneck of the achievable rates of the two information flows is developed subject to a finite power constraint. Finally, simulations demonstrate a remarkable throughput gain over the conventional cellular systems.