过载MISO广播信道中的编码缓存
On Coded Caching in the Overloaded MISO Broadcast Channel
摘要：
本文研究了多输入单输出（MISO）广播信道（BC）中编码缓存和空间复用的相互作用，即用户数大于发射天线数的系统。一方面，编码缓存使用用户的聚合全局缓存来创建多播机会。另一方面，发射机处的多个天线利用可用的CSIT来同时发送多个流。在本文中，我们介绍了一种新的方案，它结合了来自编码缓存和空间复用的增益，并优于现有的计划在交付时间和CSIT的要求。
英文摘要：
This work investigates the interplay of coded caching and spatial multiplexing in an overloaded Multiple-Input-Single-Output (MISO) Broadcast Channel (BC), i.e. a system where the number of users is greater than the number of transmitting antennas. On one hand, coded caching uses the aggregate global cache memory of the users to create multicasting opportunities. On the other hand, multiple antennas at the transmitter leverage the available CSIT to transmit multiple streams simultaneously. In this paper, we introduce a novel scheme which combines both the gain derived from coded-caching and spatial multiplexing and outperforms existing schemes in terms of delivery time and CSIT requirement.
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