Restricted coverage in high-frequency systems poses significant challenges due to several factors:
Blockage Vulnerability: High-frequency signals are susceptible to blockages caused by obstacles such as buildings or environmental structures. This leads to unreliable communication links between access points and user equipment.
Propagation Loss: The extreme propagation loss associated with high-frequency signals results in reduced signal strength over distance, limiting coverage areas significantly.
Hardware Limitations: Transmitters operating at millimeter wave/terahertz frequencies have low transmit power capabilities due to hardware specifications.
These implications highlight the need for innovative solutions like cooperative communication and rate-splitting techniques proposed in the study to overcome restricted coverage issues and enhance system performance in high-frequency environments.