Signal Performance Characterization of Visible Light Nonorthogonal Multiple Access With Integrated Sensing and Communication Network

This paper exploits the signal performance characterization of visible light nonorthogonal multiple access (VL‐NOMA) for integrated sensing and communication (ISAC) network. The VL as a carrier uses light‐emitting diode (LED) to broadcast data to multiple users. In conventional scenarios like orthogonal multiple access (OMA), the prime challenge for enhancing the signals’ strength arises due to users’ position while designing the system as OMA serves multiple users on the resource (time, frequency, etc.) sharing bases. On the other hand, NOMA has a unique feature to serve multiple users with the same one source, time, and frequency. Therefore, we have designed this system for ISAC and examined the achieved data rate, outage probability, channel capacity region, and signal‐interference‐to‐noise ratio (SINR) performance. Further, we have investigated the performance of downlink transmission signals, communication signals, sensing signal target, sensing signal, and sensing echo signals. We observed that the system recorded achieved data rate up to 0.6 bps/Hz, outage probability from 10 9 to10 0 at SINR of 28 dBm, and then channel capacity up to 0.9 bps/Hz at SINR of 32 dBm. Moreover, it is perceived that the VL‐NOMA ISAC performs better than VL‐OMA ISAC in terms of SINR, achieved data rate, outage probability, and channel capacity region. Furthermore, we optimized the system, and we observed that the optimized VL‐NOMA ISAC performs better than optimized VL‐OMA ISAC considering channel capacity regions.