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.

翻译：本文分析了多用户综合遥感和通信系统(ISAC)的性能,该系统利用非横向多重存取(NOMA)来减轻用户之间的干扰,并得出封闭式表达方式来评价断电概率、ergodic通信率和感测率,此外,还进行了非现时分析,以揭开据认为的NOMA-ISAC系统的多样性订单和高信号对噪音比率坡度,作为进一步的进展,还标明了ISAC可实现的遥感速率区域,证明ISAC系统能够实现比常规的频率分判感和通信系统更大的速率区域。