The optimal placement of radio stations in coexisting DRM+ and analog FM systems

Currently in wireless communication technology, digital radio systems are replacing analog radio systems. The digital radio service provides better quality sound to receiver and uses frequency efficiently. However, digital radio has the potential to cause interference problem, since in-band digital radio systems occupy existing analog radio frequency bands. It is important to effectively analyze this interference for both digital radio receivers and analog radio receivers. This paper analyzes the interference between the DRM+ system used in in-band digital radio and the existing analog FM system, and derives the optimal separation distance needed to preclude interference. These results are able to supply basic information for digital radio system cell design.