Vector bin-and-cancel for MIMO distributed full-duplex

Abstract

In a multi-input multi-output (MIMO) full-duplex network, where an in-band full-duplex infrastructure node communicates with two half-duplex mobiles supporting simultaneous up-and downlink flows, the inter-mobile interference between the up-and downlink mobiles limits the system performance. We study the impact of leveraging an out-of-band side channel between mobiles in such network under different channel models. For time-invariant channels, we aim to characterize the generalized degrees-of-freedom (GDoF) of the side-channel-assisted MIMO full-duplex network. For slow-fading channels, we focus on the diversity-multiplexing tradeoff (DMT) of the system with various assumptions as to the availability of channel state information at the transmitter (CSIT). The key to the optimal performance is a vector bin-and-cancel strategy leveraging Han-Kobayashi message splitting, which is shown to achieve the system capacity region to within a constant bit. We quantify how the side channel improve the GDoF and DMT compared to a system without the extra orthogonal spectrum. The insights gained from our analysis reveal (i) the tradeoff between spatial resources from multiple antennas at different nodes and spectral resources of the side channel and (ii) the interplay between the channel uncertainty at the transmitter and use of the side channel.

MIMO Full-Duplex Precoding: A Joint Beamforming and Self-Interference Cancellation Structure

“…FD MU-MIMO systems where Base Stations (BSs) operate in FD-mode while Mobile Stations (MSs) operate in HD-mode are studied in [14]- [18]. In order to simplify the derivations, the interference caused by uplink transmission to downlink MSs was ignored in [14] and [15].…”

Full‐duplex OFDMA multi‐user cellular systems: resource allocation and user pairing

“…FD techniques have been applied to multi-user cellular systems in which the base station (BS) is allowed to transmit and receive signals using the same time-frequency block, while the uplink (UL) users and downlink (DL) users work in a HD way [13][14][15][16][17][18][19][20][21][22]. In such systems, UL transmissions are interfered by SI from DL transmissions at BS, while DL transmissions are interfered by the interuser interference (IUI) from UL users.…”

“…Furthermore, a joint precoding at the BS and UL users has been developed to maximize the system sum-rate. In [18,19], the achievable rate is analyzed when SI is ignored and additional links between UL users and DL users are introduced. To the best of our knowledge, most literatures studying FD cellular systems have focused on designing precoding under a MIMO setting, and few works have considered the resource allocation problem of FD orthogonal frequency division multiple access (OFDMA) cellular systems.…”