Degrees of freedom of uplink-downlink multiantenna cellular networks

Jeon, Sang-Woon; Suh, Changho

doi:10.1109/isit.2014.6875102

Cited by 10 publications

References 40 publications

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Interference Neutralization With Partial CSIT for Full-Duplex Cellular Networks

Liu

Li³

2019

IEEE Access

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Compared to half-duplex (HD) communications, full-duplex (FD) communications have the potential to double the throughput of the cellular networks. However, the inter-user interference (IUI) from the uplink (UL) users to the downlink (DL) users severely hinders the improvement of the throughput. In this paper, we propose an interference neutralization (IN) scheme to eliminate the IUI with the help of partial channel state information at the transmitter (CSIT). Before the UL signals are transmitted, we rotate their phases through a set of scalars known by the base station (BS), which endows the conventional receive antennas of the BS with the reconfigurability. The BS assists the IUI management by precoding and forwarding the UL signals to the DL users. Consequently, the UL signals forwarded by the BS locate in the opposite direction of the IUI so as to neutralize it. After the IUI is neutralized, all the symbols of the last time slots can be recovered. The DoF region and the corresponding feasible conditions are analyzed. The analysis and numerical results demonstrate that 1.5-fold DoF over that of the HD systems can be achieved via the proposed IN scheme with only partial CSIT and 2 symbol extensions. It shows that the proposed scheme is a low complexity interference management scheme for the FD cellular networks.INDEX TERMS Full-duplex, inter-user interference (IUI), CSIT, Degrees of Freedom (DoF).

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Interference Neutralization With Partial CSIT for Full-Duplex Cellular Networks

Liu

Li³

2019

IEEE Access

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On the spatial degrees of freedom benefits of reverse TDD in multicell MIMO networks

Fanjul

Santamarı́a

2016

2016 24th European Signal Processing Conference (EUSIPCO)

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In this paper we study the degrees of freedom (DoF) achieved by interference alignment (IA) for cellular networks in reverse time division duplex (R-TDD) mode, a new configuration associated to heterogeneous networks. We derive a necessary feasibility condition for interference alignment in the multi-cell R-TDD scenario, which is then specialized to the particular case of symmetric demands and antenna distribution. We show that, for those symmetric networks for which the properness condition holds with equality, R-TDD does not improve the DoF performance of conventional synchronous TDD systems. Nevertheless, our simulation results indicate that, in more asymmetric scenarios, significant DoF benefits can be achieved by applying the R-TDD approach.

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On the degrees of freedom of multiantenna interfering broadcast channels

Jeon

Lee

2014

2014 International Conference on Information and Communication Technology Convergence (ICTC)

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The degrees of freedom (DoF) of multiantenna interfering broadcast channels is studied in which the first base station (BS) with M1 antennas wishes to send independent messages to its N1 serving users and the second BS with M2 antennas wishes to send independent messages to its N2 serving users. Each user is assumed to be equipped with a single antenna. For max(M1, M2) ≤ min(N1, N2), the sum DoF is shown to be upper bounded byThe results characterize the optimal sum DoF if M1N2 = M2N1 and further characterize the asymptotically optimal sum DoF when both N1 and N2 tend to infinity. Specifically, the optimal sum DoF converges to M1 + M2 as N1 and N2 tend to infinity.

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Degrees of freedom of uplink-downlink multiantenna cellular networks

Cited by 10 publications

References 40 publications

Interference Neutralization With Partial CSIT for Full-Duplex Cellular Networks

Interference Neutralization With Partial CSIT for Full-Duplex Cellular Networks

On the spatial degrees of freedom benefits of reverse TDD in multicell MIMO networks

On the degrees of freedom of multiantenna interfering broadcast channels

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