Embodiments disclosed herein relate generally to digital transponders. In one broad aspect, there is provided a digital transponder comprising: (a) an analog to digital converter configured to receive a real analog wideband multi-carrier signal and generate a real digital wideband multi-carrier signal...http://www.google.de/patents/US8077760?utm_source=gb-gplus-sharePatent US8077760 - Digital transponder with real signal channelizer and synthesizer
