Cognitive radio networks (CRNs) have been widely used in various applications for effective radio spectrum utilization in recent years. It is essential to fend off the growing demand for this finite natural resource for next-generation communications. In CRNs. detecting the activity of the primary user requires opportunistic spectrum sensing for efficient usage of the available radio ... https://www.chiggate.com/color-charm-12n-1200-high-lift-blonde-1-4oz-online-now/