Walid El-Shafai Ahmed Fawzi Abd-El Halim Zekry Mohammed Abd-Elnaby Fathi E. Abd El-Samie Spectrum Sensing Optimization Using Wavelet Denoising and Energy Detection for Cognitive Radio Systems. 271-306 2025 August 143 Wirel. Pers. Commun. 3-4 https://doi.org/10.1007/s11277-024-11534-0 db/journals/wpc/wpc143.html#ElShafaiFZAE25 streams/journals/wpc