The Application of Receiver Operating Characteristics to Improve Mobile Subscriber Equipment

Improved Mobile Subscriber Equipment (IMSE) provides probable detection of, and access to, a mobile communication system in emergency situations. Sometimes one piece of IMSE can receive multiple signals at the same time. In such situations, the IMSE needs to identify the required signal. In this study, we use the receiver operating characteristic (ROC) curve to indentify the required signal. In most cases, a receiver can detect a strong and clear signal which has a high signal to noise ratio and receiving samples. For example, when the signal to noise ratio (SNR) increases from 0.23 to 0.75, it shows that the probability of detection also increases from 0.8433 to 0.9999 in the same sample. On the other hand, in the same SNR situation of 0.75, for example, when receivers gain signal samples from 20 to 200, the probability of detection increases at the same time. Thus, receivers are able to easily identify the signal with the highest number of samples and SNR if there are two or more signals being received at the same time, and then use ROC curves to show their probability of detection and probability of false alarm for the target signal.