  We introduce conferencing-based distributed channel quantizers for two-user
interference networks where interference signals are treated as noise. Compared
with the conventional distributed quantizers where each receiver quantizes its
own channel independently, the proposed quantizers allow multiple rounds of
feedback communication in the form of conferencing between receivers. We take
the network outage probabilities of sum rate and minimum rate as performance
measures and consider quantizer design in the transmission strategies of time
sharing and interference transmission. First, we propose distributed quantizers
that achieve the optimal network outage probability of sum rate for both time
sharing and interference transmission strategies with an average feedback rate
of only two bits per channel state. Then, for the time sharing strategy, we
propose a distributed quantizer that achieves the optimal network outage
probability of minimum rate with finite average feedback rate; conventional
quantizers require infinite rate to achieve the same performance. For the
interference transmission strategy, a distributed quantizer that can approach
the optimal network outage probability of minimum rate closely is also
proposed. Numerical simulations confirm that our distributed quantizers based
on conferencing outperform the conventional ones.
