The research on Repeater Coordination Based on band plan

It is very troublesome that repeaters could interfere with one another. So we need to coordinate them. In our paper, we flexibly use the technology CTCSS (Continuous Tone-coded Squelch System) to avoid interfere and accommodate more simultaneous users with the least repeaters. Then we propose a mixed-frequency-band repeater network consist of some single-frequency-point repeater networks. Secondly, considered that the causes and solutions of interference might occur in a repeater network, we propose a "band plan" to reduce the "multi-path" interference in frequency and phase. Then combined with the most efficient repeater networks, we apply our model about “band plan” into the plat area. According to some limiting conditions, we bring the reality datum into our repeater network model to accommodate 1,000 simultaneous users, and conclude that the minimum of repeaters is 76. Finally, we apply our plan into a mountain area, in order to meet some new circumstances there, we adjust our”band plan” and repeaters to avoid interfere.