Millimeter Wave Communication With Active Ambient Perception

Abstract

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.

[Retracted] Sensor‐Based Environmental Perception Technology for Intelligent Vehicles

“…It scans the target or obstacles through the onboard radar to realize the desired speed or cruise at the preset speed. In the 1960s [26], Germany, Sweden, Japan, and other developed countries first carried out research work on millimeter-wave radar. In the research of 77 GHz millimeter-wave radar [27], Sweden and Germany developed the adaptive intelligent driving control system and the autonomous cruise control system in 1986 and 2003, respectively, and Germany's Bosch initially realized the commercial use of 77 GHz radar.…”

Joint Multi-User Communication and Sensing Exploiting Both Signal and Environment Sparsity

“…Such kind of environment sensing has long been accomplished by traditional Radar technology which has been re-garded as a related but separate field from communication. However, the channel state information (CSI) obtained during the communication process usually contains certain knowledge of the environment [6], [7], and likewise, the environment sensing result also helps improve the accuracy of channel estimation and enhance the performance of communication [8], [9]. As the wireless network operates in higher frequency with wider bandwidth and deploys denser base stations with a larger amount of antennas, its longly-neglected sensing capability inherited from the intrinsic nature of electromagnetic wave propagation becomes even more explorable.…”

Distributed Radar-aided Vehicle-to-Vehicle Communication

“…A method to address the lack of synchronization between vehicles and BS is proposed. In [21] an indoor mmWave communication system is developed, where an access point first senses the environment. Once the environment is mapped, communication towards a specific user in a certain location is performed based on predicted propagation paths (including reflected paths).…”