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.
Highlights
Mobile devices have multiple radios to simultaneously access different parts of the spectrum, e.g., cellular and ISM bands
We evaluate the required side-channel bandwidth to achieve the no-interference generalized degrees-of-freedom (GDoF) and diversity-multiplexing tradeoff (DMT) under different channel models such that the effect of intermobile interference can be completely eliminated via side channel
In [6], we proposed a distributed full-duplex architecture which is enabled by a wireless side channel of finite bandwidth when the transmitter and interfered receiver are not co-located
Summary
Mobile devices have multiple radios to simultaneously access different parts of the spectrum, e.g., cellular and ISM bands. The ability of simultaneous access to multiple parts of the spectrum provides an opportunity to use multiple bands in new and unique ways. A common method is to use the two bands to access both cellular and ISM band networks (notably WiFi) at the same time, which is an integral part of cellular provider data strategy to offload cellular traffic to WiFi networks [1]. The main network could be on a cellular band while the wireless side channel could be on an unlicensed ISM band. The conventional use of D2D involves establishing peer-to-peer communication [2], forming virtual MIMO by cooperative communication [3] or offloading cellular traffic [4]. We propose to use the D2D side channel for interference management to improve the cellular capacity,
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