  In this work, we study the value of cooperative transmission in wireless
networks if no channel state information is available at the transmitters (no
CSIT). Our focus is on large locally connected networks, where each transmitter
is connected to the receiver that has the same index as well as L succeeding
receivers. The cases of L=1 and L=2 represent Wyner's asymmetric and symmetric
network models, respectively. The considered rate criterion is the per user
Degrees of Freedom (puDoF) as the number of transmitter-receiver pairs goes to
infinity. For the case when L=1, it was shown in previous work that linear
cooperation schemes do not increases the puDoF value, and that the optimal
scheme relies on assigning each message to a single transmitter and using
orthogonal access (TDMA). Here, we extend this conclusion to the case where
L=2, by proving optimality of TDMA in this case as well. We conclude by
discussing whether increasing the value of L can create a value for linear
cooperation schemes from a DoF perspective.
