It depends on what you mean by "digital signal". If you mean a broadcast to the public 'over the air' (satellite, Freeview etc.), no, there is no way to locate the viewer.
If you mean a digital broadcast over the internet, yes it is possible because to connect to the source your IP address has to be passed to the source or some distribution system. The IP address is unique to you, at least for the duration of the connection and your network provider can trace it directly to you.
Brian.