and in an
ordered fashion among the users so that a given user experiences interference
only from users encoded after it. In other words, a given user receives zero
power from the signals of users that are encoded earlier in the sequence,
as if the signals of these users were “pre-subtracted” at the transmitter. In
our example, user 1 would be encoded in a conventional (capacity-achieving)
manner, then user 2 would be encoded using DPC with non-causal knowledge
of user 1’s data signal.