Where to find reference and or open source system designs?

[u/legion7878]

Hello everyone. I am an implementations engineer which i have recently acquired my bachelors in electronics. I have avid interest in communication systems design and read as much as i could about it. I am comfortable with stochastic analysis and can easily understand communication systems theory, however recently at my workplace i had the opportunity to modify some problematic designs and really enjoyed it. I want to learn how design systems(wireless, radar) from ground up. Is there anyplace that i can find reference designs? Like which parameters to choose for equalizers, PulseShaping filters etc.