Probability of Multipath Signature Separability

Elimination of co-channel interference in a multiple antenna receiver scenario has long been considered a beamforming problem. Such a solution becomes largely ineffective when the interference source is almost co-located with the desired signal source. Interference elimination cannot thus be achieved via beamforming alone. If the multipath signatures of the desired and interfering signals can be discerned, they can be effectively utilized to separate the desired signal from the interfering signal at high probabilities for acceptably low MMSE levels. Such attractive results can be achieved for users as close as λ/10.