I’ve done some FGPA work in the past using Verilog. Pretty sure I’ve still got some code floating around. It was mostly to interface w a 7" LCD and SDRAM though
Software Defined Radios are actually not legal to purchase as a consumer product because it is impossible to obtain FCC certification for them (since they are defined at run time with software), so you can’t sell them as a single unit so you will have to get the high speed ADCsand DACs separately.
I personally prefer MicroSemi’s SmartFusion line of FPGAs because they have a Hard processor in package and their Flash based FPGA arch. doesn’t suffer from Firm Errors that arise from Ionizing radiation.
I’ve their radio and they are absolute outstanding. On the site there’s lot of docs about SDR. They now use Xilinx fpga for the last incredible model 6000.
The software powersdr is also available in src. It is vs2008 c#.