具有主动环境感知的MmWave通信
MmWave Communication With Active Ambient Perception
摘要：
在现有的通信系统中，当每个UE（用户设备）移动到新的位置或另一个UE取代其位置时，应该重复地估计每个UE（用户设备）的信道状态信息。底层环境信息，包括潜在反射器的具体布局，其提供关于所有UE的信道结构的更详细信息，尚未被充分探索和利用。在本文中，我们重新思考毫米波信道估计问题，在一个新的和间接的方式，即，不是在每个时间和对于任何特定位置估计所得到的复合信道响应，而是首先利用毫米波天线阵列的吸引人的雷达能力进行环境感知，然后完成基于位置的稀疏信道重构。以这种方式，可以基于感知的环境信息快速合成到达特定位置的准静态UE的稀疏信道，从而大大降低信令开销和在线计算复杂度。基于重构的毫米波信道，设计并实现了单波束毫米波通信，取得了良好的性能。这种方法实际上将雷达与通信结合起来，这可能为未来的通信系统设计开辟一种新的范例。
英文摘要：
In existing communication systems, the channel state information of each UE (user equipment) should be repeatedly estimated when it moves to a new position or another UE takes its place. The underlying ambient information, including the specific layout of potential reflectors, which provides more detailed information about all UEs' channel structures, has not been fully explored and exploited. In this paper, we rethink the mmWave channel estimation problem in a new and indirect way, i.e., instead of estimating the resultant composite channel response at each time and for any specific location, we first conduct the ambient perception exploiting the fascinating radar capability of a mmWave antenna array and then accomplish the location-based sparse channel reconstruction. In this way, the sparse channel for a quasi-static UE arriving at a specific location can be rapidly synthesized based on the perceived ambient information, thus greatly reducing the signalling overhead and online computational complexity. Based on the reconstructed mmWave channel, single-beam mmWave communication is designed and evaluated which shows excellent performance. Such an approach in fact integrates radar with communication, which may possibly open a new paradigm for future communication system design.
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