This paper analyzes the performance of a multiuser integrated sensing and communications (ISAC) system, where nonorthogonal multiple access (NOMA) is exploited to mitigate inter-user interference. Closed-form expressions are derived to evaluate the outage probability, ergodic communication rate, and sensing rate. Furthermore, asymptotic analyses are carried out to unveil diversity orders and high signal-to-noise ratio (SNR) slopes of the considered NOMA-ISAC system. As the further advance, the achievable sensing-communication rate region of ISAC is characterized. It is proved that ISAC system is capable of achieving a larger rate region than the conventional frequency-division sensing and communications (FDSAC) system.
@article{arxiv.2205.13756,
title = {NOMA-ISAC: Performance Analysis and Rate Region Characterization},
author = {Chongjun Ouyang and Yuanwei Liu and Hongwen Yang},
journal= {arXiv preprint arXiv:2205.13756},
year = {2022}
}