High-speed wireless digital design
(Stream of consciousness notes and comments)

Well, I/Q is the way to go. Is this 100M Bits or Bytes/Second? There's a big difference. @ 100MBit/Sec you might be able to use an wifi approach. I don't think wifi will support 100MByte/Sec. 

If you have to roll your own system, then you'll need to worry about framing, error correction, synchronization, filtering, etc. 

Is this intended to be a full duplex system? in other words, do you need to transmit from both sides of the communications link? 

You'll need a fair amount of modulation bandwidth, probably 50 MHz or more, so what frequency band are  you planning on using, and how far does this need to go. There's been a lot of work in the 60GHz band recently for short distance, and there's plenty of data bandwidth there, that might be something to think about.