CODE DIVISION OFDM JOINT COMMUNICATION AND SENSING SYSTEM FOR WIRELESS COMMUNICATION

Abstract

JCS) system can provide higher spectrum
efficiency and load-saving for 6G machine-type
communication (MTC) applications by merging
necessary communication and sensing abilities
with unified spec- trum and transceivers. In
order to suppress the mutual inter- ference
between the communication and radar sensing
signals to improve the communication reliability
and radar sensing accuracy, we propose a novel
code-division orthogonal frequency division
multiplex (CD-OFDM) JCS MTC system, where
MTC users can simultaneously and continuously
conduct communi- cation and sensing with each
other. We propose a novel CD- OFDM JCS
signal and corresponding successiveinterference-
cancellation (SIC) based signal
processing technique that obtains code-division
multiplex (CDM) gain, which is compatible
with the prevalent orthogonal frequency division
multiplex (OFDM) communication system. To
model the unified JCS signal trans- mission and
reception process, we propose a novel unified
JCS channel model. Finally, the simulation and
numerical results are shown to verify the
feasibility of the CD-OFDM JCS MTC system
and the error propagation performance. We
show that the CD-OFDM JCS MTC system can
achieve not only more reliable communication
but also comparably robust radar sensing
compared with the precedent OFDM JCS
system, especially in low signal-to-interferenceand-
noise ratio (SINR) regime.
Index Terms—Machine type communications,
joint communi- cation and sensing, codedivision
OFDM, interference cancella- tion.