To encounter the continuous increasing of bandwidth-demand at the end-users of wireless and optical communication networks, the millimeter-wave (MMW) carriers are used for future broadband wireless networks. The next generation of wireless networks is usually developed and implemented based on utilization of the available spectrum in the MMW frequency bands (30–300 GHz) to provide multi-Gigabit networks with high reliable transmission over large distances. The MMW wireless communication suffers from the channel fading which leads to limiting the coverage range and the mobility. To design the wireless networks based on the MMW spectrum, the performance of these networks must be optimized to offer huge data rate, low latency, and high spectrum efficiency.

This special issue aims to offer the recent trends and challenges of the MMW transmission in the wireless networks. This issue accepts high quality articles containing original research and review papers which are useful for readers of this journal with new contributions and rich information.

Potential topics include but are not limited to the following:

• 5G wireless communication system
• Ultra-wideband wireless system
• Radio access network for 5G
• Cognitive radio network (CRN)
• Mobile cellular network
• Fiber-wireless (FiWi) access network
• Millimeter-wave transmission over fiber
• Millimeter-wave over free space optics (FSO)
• Millimeter-wave antenna
• Millimeter-wave amplifiers and filters