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Fig. 1 MIMO full-duplex network: inter-mobile interference becomes an important factor when the full-duplex infrastructure node communicates with uplink and downlink mobile nodes simultaneously.
As a result, we proposed a distributed full-duplex architecture [6] to leverage the wireless side channels to mitigate inter-mobile interference.
The result provides guidance towards system design; larger number of BS antennas, e.g., recent discussions on massive MIMO [15], can help reduce the required side-channel bandwidth to combat inter-mobile interference.
We evaluate the required side-channel bandwidth to achieve the no-interference GDoF and DMT under different channel models such that the effect of inter-mobile interference can be completely eliminated via side channel.
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.
Thus, we conclude that having more spatial degree-of-freedom at the interfered downlink receiver or larger side-channel bandwidth can simplify transceiver design by ruling out the necessity of obtaining CSIT to null out the effect of inter-mobile interference.
A major bottleneck in this network is the inter-mobile interference from uplink mobile (node M1) to downlink mobile node (node M2), because of which the degrees-of-freedom of the network collapse to one when all nodes are equipped with single antenna (SISO) [6].
In this paper, we propose the use of wireless side channel to manage inter-mobile interference in MIMO full-duplex network where the BS supports both an up- and downlink flow in the same band simultaneously for the half-duplex mobile nodes.
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