Software Defined Radio (SDR)
Data transmission techniques using frequency hopping or direct sequence spread spectrum modulation require digital signal processing at high sampling rates. Ideally the antenna and LNB is directly followed by an A/D converter operating at hundreds of MHz.
Off-the-shelf radio frontends are available as FMC mezzanine cards. An FPGA preprocesses the high-speed data stream and applies filters and downsampling. The final processing and demodulation is performed by a DSP.