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Title: Retrospective Interference Alignment: Degrees of Freedom Scaling With Distributed Transmitters
Author: Castanheira, D.
Silva, A.
Gameiro, A.
Keywords: Interference channel
Interference alignment
Retrospective interference alignment
Delayed feedback
Degrees of freedom
Issue Date: 2017
Publisher: IEEE
Abstract: In this paper, we consider the K-user singleinput single-output interference channel with delayed channel state information at the transmitters (CSIT). Our main contribution is to show that even with delayed CSIT and distributed transmitters, the achievable degrees of freedom (DoFs) still scale with the number of users. More specifically, we propose a method that achieves K/(2 √K −1) ≥ √K/2 DoF. The main idea behind the proposed method is to use interference alignment (IA) at the receiver side in conjunction with repetition coding at the transmitters. Repetition coding repeats the data R times while IA makes the interference generated by a given transmitter identical: 1) at all non-intended receivers and 2) all transmission repetitions. Therefore, one retransmission per transmitter is sufficient to cancel all the interference. This reduces significantly the overhead required for interference removal since the number of interference terms is reduced from R K(K − 1) to K.
Peer review: yes
DOI: 10.1109/TIT.2017.2655343
ISSN: 0018-9448
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