On the Degrees of Freedom of K-User SISO Interference and X Channels with Delayed CSIT

2011/09/30 by Mohammad Javad Abdoli, Akbar Ghasemi, Amir Keyvan Khandani · 1 citation
Computer Science · Mathematics · #cs.IT #math.IT

paper · pdf · doi:10.1109/tit.2013.2268154

published as IEEE Trans. Inf. Theory, vol. 59, no. 10, pp. 6542-6561, 2013 · 30 pages, 6 figures, 2 tables; Published in IEEE Transactions on Information Theory, Oct. 2013

arxiv created 2013/11/08 · arxiv updated 2013/11/11

Abstract

The K-user single-input single-output (SISO) AWGN interference channel and 2× K SISO AWGN X channel are considered where the transmitters have the delayed channel state information (CSI) through noiseless feedback links. Multi-phase transmission schemes are proposed for both channels which possess novel ingredients, namely, multi-phase partial interference nulling, distributed interference management via user scheduling, and distributed higher-order symbol generation. The achieved degrees of freedom (DoF) values are greater than the best previously known DoFs for both channels with delayed CSI at transmitters.

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