1 research outputs found
Bounds on the Effective-length of Optimal Codes for Interference Channel with Feedback
In this paper, we investigate the necessity of finite blocklength codes in
distributed transmission of independent message sets over channels with
feedback. Previously, it was shown that finite effective length codes are
necessary in distributed transmission and compression of sources. We provide
two examples of three user interference channels with feedback where codes with
asymptotically large effective lengths are sub-optimal. As a result, we
conclude that coded transmission using finite effective length codes is
necessary to achieve optimality. We argue that the sub-optimal performance of
large effective length codes is due to their inefficiency in preserving the
correlation between the inputs to the distributed terminals in the
communication system. This correlation is made available by the presence of
feedback at the terminals and is used as a means for coordination between the
terminals when using finite effective length coding strategies