Downlink (DL) and uplink (UL) joint communication and sensing (JCAS)
technologies have been individually studied for realizing sensing using DL and
UL communication signals, respectively. Since the spatial environment and JCAS
channels in the consecutive DL and UL JCAS time slots are generally unchanged,
DL and UL JCAS may be jointly designed to achieve better sensing performance.
In this paper, we propose a novel DL and UL cooperative (DUC) JCAS scheme,
including a unified multiple signal classification (MUSIC)-based JCAS sensing
scheme for both DL and UL JCAS and a DUC JCAS fusion method. The unified MUSIC
JCAS sensing scheme can accurately estimate AoA, range, and Doppler based on a
unified MUSIC-based sensing module. The DUC JCAS fusion method can distinguish
between the sensing results of the communication user and other dumb targets.
Moreover, by exploiting the channel reciprocity, it can also improve the
sensing and channel state information (CSI) estimation accuracy. Extensive
simulation results validate the proposed DUC JCAS scheme. It is shown that the
minimum location and velocity estimation mean square errors of the proposed DUC
JCAS scheme are about 20 dB lower than those of the state-of-the-art separated
DL and UL JCAS schemes.Comment: 14 pages, 10 figures, submitted to IEEE Transactions on
Communication