I want to work on co-frequency and co-time blind signals separation or carrier-in-carrier signal separation project. In articles published under the heading of blind separation of these signals, it is always assumed that one of the signals is known and the other signal is obtained by using that. I couldn't find an article in which both signals were unknown and separated. This has confused me. Is there anyone who has worked on this and guided me? Is there anyone who has worked on this and guided me?
In telecommunications, Raise-Cosine pulse shaping is used to send information, which according to the Fourier series is a set of sinusoidal and cosine signals. Patent articles indicate that carrier-in-carrier separation is done by using adaptive filter. In this way, the received signal (which is the sum of the first and second signals) enters the filter with one of them and by subtracting it from the received signal, another signal is obtained. Some articles have also pointed out that if the power difference between the two signals is significant, the second signal is obtained by using a trick.
However, various articles have suggested that if the power difference between the two signals is 0 dB, it is possible to obtain both signals blindly and without any of them. Is such a claim true?