Frequency Interference, Analysis Method, and Application Examples of Sub-GHz Frequency Band

Utilizing the frequency spectrum efficiently is critical to properly respond to increasing frequency demands owing to the rapid spread of wireless devices and the latest broadband technology trends. However, because all wireless devices emit radio waves into air, frequency interference with other wireless devices can be caused. If the use of these wireless devices is restricted owing to uncertain fears of such frequency interference, efficient utilization of the frequency spectrum becomes difficult. Therefore, it is crucial to quantitatively analyze frequency interference and establish a reasonable countermeasure against it. Therefore, this study shows that the frequency interference generated by wireless devices can be explained in terms of total interference power. However, practically, this approach is limited for various reasons. These shortcomings are discussed herein through an actual frequency allocation case considering frequency interference in the licensed and unlicensed bands of the sub-GHz band, in which several frequency interference issues are faced.