Preprint Article Version 1 This version is not peer-reviewed

Revisiting Degrees of Freedom of Full-Duplex Systems with Opportunistic Transmission: An Improved User Scaling Law

Version 1 : Received: 5 January 2018 / Approved: 7 January 2018 / Online: 7 January 2018 (11:46:28 CET)

A peer-reviewed article of this Preprint also exists.

Kim, H.; Kim, J.; Choi, S.W.; Shin, W.-Y. Revisiting Degrees of Freedom of Full-Duplex Systems with Opportunistic Transmission: An Improved User Scaling Law. Entropy 2018, 20, 160. Kim, H.; Kim, J.; Choi, S.W.; Shin, W.-Y. Revisiting Degrees of Freedom of Full-Duplex Systems with Opportunistic Transmission: An Improved User Scaling Law. Entropy 2018, 20, 160.

Journal reference: Entropy 2018, 20, 160
DOI: 10.3390/e20030160

Abstract

It was recently studied how to achieve the optimal degrees of freedom (DoF) in a multi-antenna full-duplex system with partial channel state information (CSI). In this paper, we revisit the DoF of a multiple-antenna full-duplex system using opportunistic transmission under the partial CSI, in which a full-duplex base station having M transmit antennas and M receive antennas supports a set of half-duplex mobile stations (MSs) having a single antenna each. Assuming no self-interference, we present a new hybrid opportunistic scheduling method that achieves the optimal sum DoF under an improved user scaling law. It is shown that the optimal sum DoF of 2M is asymptotically achievable provided that the number of MSs scales faster than SNRM, where SNR denotes the signal-to-noise ratio. This result reveals that in our full-duplex system, better performance on the user scaling law can be obtained without extra CSI, compared to the prior work that showed the required user scaling condition (i.e., the minimum number of MSs for guaranteeing the optimal DoF) of SNR2M−1.

Subject Areas

degrees of freedom (DoF); full-duplex systems; hybrid opportunistic scheduling; partial channel state information (CSI); user scaling law

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