Volumio to IP radio station

Hi guys, Im working on the project for my university, I need to create IP radio network, so I thought to use Volumio. But here is one thing, I need to get a wireless audio and convert it to HDMI somehow, because I will run this signal over coax as well, we have hdmi qam modulator, it outputs DVB-C radio for TV sets and IPTV sream for RTP streaming. So could you give me a link to tutorial or something similar? Any advice is valuable for me, thanks!