1,437 research outputs found
Full-Duplex Radio for Uplink/Downlink Transmission with Spatial Randomness
We consider a wireless system with a full-duplex (FD) access point (AP) that
transmits to a scheduled user in the downlink (DL) channel, while receiving
data from an user in the uplink (UL) channel at the same time on the same
frequency. In this system, loopback interference (LI) at the AP and inter user
interference between the uplink (UL) user and downlink (DL) user can cause
performance degradation. In order to characterize the effects of LI and inter
user interference, we derive closed-form expressions for the outage probability
and achievable sum rate of the system. In addition an asymptotic analysis that
reveals insights into the system behavior and performance degradation is
presented. Our results indicate that under certain conditions, FD transmissions
yield performance gains over half-duplex (HD) mode of operation.Comment: Accepted for the IEEE International Conference on Communications (ICC
2015
Joint Design of Multi-Tap Analog Cancellation and Digital Beamforming for Reduced Complexity Full Duplex MIMO Systems
Incorporating full duplex operation in Multiple Input Multiple Output (MIMO)
systems provides the potential of boosting throughput performance. However, the
hardware complexity of the analog self-interference canceller scales with the
number of transmit and receive antennas, thus exploiting the benefits of analog
cancellation becomes impractical for full duplex MIMO transceivers. In this
paper, we present a novel architecture for the analog canceller comprising of
reduced number of taps (tap refers to a line of fixed delay and variable phase
shifter and attenuator) and simple multiplexers for efficient signal routing
among the transmit and receive radio frequency chains. In contrast to the
available analog cancellation architectures, the values for each tap and the
configuration of the multiplexers are jointly designed with the digital
beamforming filters according to certain performance objectives. Focusing on a
narrowband flat fading channel model as an example, we present a general
optimization framework for the joint design of analog cancellation and digital
beamforming. We also detail a particular optimization objective together with
its derived solution for the latter architectural components. Representative
computer simulation results demonstrate the superiority of the proposed low
complexity full duplex MIMO system over lately available ones.Comment: 8 pages, 4 figures, IEEE ICC 201
Outage Analysis of Full-Duplex Architectures in Cellular Networks
The implementation of full-duplex (FD) radio in wireless communications is a
potential approach for achieving higher spectral efficiency. A possible
application is its employment in the next generation of cellular networks.
However, the performance of large-scale FD multiuser networks is an area mostly
unexplored. Most of the related work focuses on the performance analysis of
small-scale networks or on loop interference cancellation schemes. In this
paper, we derive the outage probability performance of large-scale FD cellular
networks in the context of two architectures: two-node and three-node. We show
how the performance is affected with respect to the model's parameters and
provide a comparison between the two architectures.Comment: to appear in Proc. IEEE VTC 2015 Spring, Glasgo
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