Integrated Human Activity Sensing and Communications

Abstract

Advance in wireless communication and signal processing facilitates integrated sensing and communication (ISAC)a technology that combines sensing and communication functionalities to efficiently utilize congested wireless/hardware resources, and to pursue mutual benefits. Consequently, the future communications network will be perceptive. In this article, we provide a review of human-related sensing in the context of ISAC. We first present a general ISAC receiver signal processing framework, with a focus on human activity recognition (HAR). Based on geographical deployments, we then categorize current ISAC HAR into three classical configurations, namely monostatic, bistatic and distributed deployments, and discuss their properties, critical research problems and solutions. In order to facilitate system realization and improve the recognition performance, we further explore inherent connections between physical-layer system parameters and HAR performance metrics. Finally, we review major technical challenges and identify key open research problems.

Optimal Precoding Design for Monostatic ISAC Systems: MSE Lower Bound and DoF Completion

“…B ENEFITING from the improved spectral-, energy-and hardware efficiency, and the ability to deploy sensing functionality into the current communication networks, the research interest for integrated sensing and communication (ISAC) has arisen in the design of the sixth-generation (6G) systems [1]. Depending on the geographical configurations, current ISAC systems are categorized into three classical configurations [2], i.e., 1) the monostatic deployment that transmits communication signals and then captures the target echoes via the co-located receiver, such as enabling a base station (BS) as a sensor; 2) the bistatic deployment that collects the reflected and scattered echoes from a separated receiver, such as various Wi-Fi sensing applications; 3) the distributed deployment that characterizes a target via signals collected from widely distributed receivers. In particular, the monostatic ISAC systems are appealing for practical implementation as it promises a pilot-free signaling strategy [1].…”

Precoder and Decoder Co-Designs for Radar and Communication Spectrum Sharing

“…Various contributions have been presented in the radar and communication spectrum sharing literature. In general, these works can be classified into three main classes [ 22 , 23 , 24 , 25 ]: codesign, cooperation and coexistence. This paper belongs to the third category.…”