This report delves into various aspects of wireless networking, beginning with an explanation of channel reuse in WLAN, including co-channel interference and different reuse modes. It then explores WMAN and WiMAX technologies, discussing their functionalities and challenges, such as DOS and jamming attacks. The report further analyzes two research papers: the first focuses on the future of the Internet of Things and its key technical problems, while the second examines the design of a ZigBee transmitter for IoT wireless devices. The ZigBee transmitter's components, including CRC and bit-to-symbol blocks, are described, providing a detailed understanding of wireless networking concepts and technologies. The report concludes with a comprehensive list of references used in the analysis.