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arXiv 1602.06209cs.ITmath.IT
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有限回程协作传输中的协作信道估计

Cooperative Channel Estimation for Coordinated Transmission with Limited Backhaul

Qianrui Li, David Gesbert, Nicolas Gresset

摘要:

在多个发射机设备处获得准确的全局信道状态信息(CSI)对于许多协调传输方案的性能是至关重要的。实际的CSI局部反馈通常导致在每个发射机处的噪声和部分CSI估计。利用速率受限的双向回程,发射机有机会交换很少的CSI相关比特以在发射机处建立全局信道状态信息(CSIT)。这项工作探讨了实现这一目标的可能战略。我们提出了一种新的分散算法,产生最小均方误差(MMSE)最优的全球信道估计在每个设备结合本地反馈和信息交换通过回程。该方法适用于任意的初始信息拓扑结构和反馈噪声统计,可以做到这一点与封闭形式和凸的方法相结合。针对两个或三个发射机的协作多点(CoMP)传输系统的仿真结果表明,在协作回程受限的情况下,该算法优于传统的CSI交换机制。

英文摘要:

Obtaining accurate global channel state information (CSI) at multiple transmitter devices is critical to the performance of many coordinated transmission schemes. Practical CSI local feedback often leads to noisy and partial CSI estimates at each transmitter. With rate-limited bi-directional backhaul, transmitters have the opportunity to exchange few CSI-related bits to establish global channel state information at transmitter (CSIT). This work investigates possible strategies towards this goal. We propose a novel decentralized algorithm that produces minimum mean square error (MMSE)-optimal global channel estimates at each device from combining local feedback and information exchanged through backhauls. The method adapts to arbitrary initial information topologies and feedback noise statistics and can do that with a combination of closed-form and convex approaches. Simulations for coordinated multi-point (CoMP) transmission systems with two or three transmitters exhibit the advantage of the proposed algorithm over conventional CSI exchange mechanisms when the coordination backhauls are limited.

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