2 research outputs found
Large Antenna Analysis of Multi-Cell Full-Duplex Networks
We study a multi-cell multi-user MIMO full-duplex network, where each base
station (BS) has multiple antennas with full-duplex capability supporting
single-antenna users with either full-duplex or half-duplex radios. We
characterize the up- and downlink ergodic achievable rates for the case of
linear precoders and receivers. The rate analysis includes practical
constraints such as imperfect self- interference cancellation, channel
estimation error, training overhead and pilot contamination. We show that the
2X gain of full-duplex over half-duplex system remains in the asymptotic regime
where the number of BS antennas grows infinitely large. We numerically evaluate
the finite SNR and antenna performance, which reveals that full-duplex networks
can use significantly fewer antennas to achieve spectral efficiency gain over
the half-duplex counterparts. In addition, the overall full-duplex gains can be
achieved under realistic 3GPP multi-cell network settings despite the increased
interference introduced in the full-duplex networks.Comment: Submitted to IEEE Transactions on Wireless Communication
Full-duplex in 5G Small Cell Access: SystemDesign and Performance Aspects
Recent achievement in self-interference cancellation algorithms enables
potential application of full-duplex (FD) in 5G radio access systems. The
exponential growth of data traffic in 5G can be supported by having more
spectrum and higher spectral efficiency. FD communication promises to double
the spectral efficiency by enabling simultaneous uplink and downlink
transmissions in the same frequency band. Yet for cellular access network with
FD base stations (BS) serving multiple users (UE), additional BS-to-BS and
UE-to-UE interferences due to FD operation could diminish the performance gain
if not tackled properly. In this article, we address the practical system
design aspects to exploit FD gain at network scale. We propose efficient
reference signal design, low-overhead channel state information feedback and
signalling mechanisms to enable FD operation, and develop low-complexity power
control and scheduling algorithms to effectively mitigate new interference
introduced by FD operation. We extensively evaluate FD network-wide performance
in various deployment scenarios and traffic environment with detailed LTE
PHY/MAC modelling. We demonstrate that FD can achieve not only appreciable
throughput gains (1.9x), but also significant transmission latency
reduction~(5-8x) compared with the half-duplex system.Comment: Submitted to IEEE Communications Magazin