Automatic modulations recognition is one of the most important aspects in cognitive radios (CRs). Unlicensed users or secondary users (SUs) tend to classify the incoming signals to recognize the type of users in the system. Once the available users are detected and classified accurately, the CR...

Research on the measurement of uncertainty has a long tradition. Recently, the creation of the economic policy uncertainty index sparked a new wave of research on this topic. The index is based on major American newspapers with the use of manual labeling and counting of specific keywords....