This letter analyzes the performance of uplink integrated sensing and communications (ISAC) systems where communication users (CUs) and radar targets (RTs) share the same frequency band. Novel expressions are derived to characterize the outage probability, ergodic communication rate, and sensing rate. Besides, the diversity order and high signal-to-noise ratio (SNR) slope are unveiled to gain more insights. It is found that when achieving the same communication rate, the ISAC system enjoys a higher sensing rate than the conventional frequency-division sensing and communications (FDSAC) system where CUs and RTs share isolated bands. All the results are validated by numerical simulations and are in excellent agreement.

翻译：这封信分析了通信用户(CUs)和雷达目标(RTs)共享同一频带的上行连接综合遥感和通信系统(ISAC)的性能,从中得出新颖的表达方式来说明断电概率、ergodic通信率和感测率,此外,多样性顺序和高信号对噪音比率(SNR)斜坡被揭开以获得更多的洞察力,发现在达到相同的通信率时,ISAC系统拥有比常规频率分散遥感和通信系统(FDSAC)更高的感测率,而CUs和RTs共用孤立波段,所有结果都经过数字模拟验证,并达成极佳的一致。