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The capacity of the most recent network architectures, such as femtocells, is severely limited by interference. This has spurred an intense research on the M-user interference channel, in which M transmitter/receiver pairs interfere with each other. Very striking recent results, though, disproved it by showing that the degrees of freedom per user in the interference channel scale as 1/2 independently of the number of interferers when a transmission scheme called INterference alignment (IN) is applied. These very promising results presuppose a complete knowledge on the Channel State Information at the Transmitters (CSIT).
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