With the global rollout of fifth-generation (5G) mobile communications, academic and industry researchers are investigating 5G (B5G) or sixth-generation (6G) technologies. It is essential in wireless system design and network deployment to model the channel it will operate in. Channel characteristics determine the fundamental performance limits (i.e., Shannon capacity) and interfere with the selection of radio interface technologies (RITs). Therefore, channel measurements and modeling methods are urgently needed, especially in new frequency bands and propagation environments for B5G and 6G.

To satisfy growing demands for wide-area connectivity, faster data rates, greater network capacity, and wider communication tasks, high-frequency wireless communication (i.e., millimeter-wave and terahertz), is considered a key enabling technology. Moreover, equipping many active elevated antenna arrays or passive surrounding intelligent reflecting surfaces (IRSs) can increase spectrum efficiency and facilitate enhanced coverage and sensing capability in specific environments. To optimize such system designs and accelerate new network deployment, full knowledge of channel characteristics and establish channel models for different frequency bands, scenarios, tasks, and transmission schemes is required.

The aim of this Special Issue is to welcome original research and review articles with new approaches and results to the channel modeling and estimation for B5G/6G.

Potential topics include but are not limited to the following:

• Radio propagation measurements and physical-statistical channel modeling in millimeter-wave and terahertz bands
• Channel models for holographic MIMO and IRS-assisted wireless communications
• Machine learning-enabled channel modeling and estimation method
• Channel modeling for integrated sensing and communication (ISAC)
• Channel modeling and analyzing based on stochastics distribution of scatterers
• Novel methodologies on analyzing channel characteristics, e.g., non-stationary characteristics
• Channel estimation in consideration of different communication tasks
• Channel modeling in consideration of different communication tasks
• Cloud/edge computing, vehicle networks, UAV networks, wireless AR/VR, wireless power transmission, wireless sensor network