17,152 research outputs found
Full-Duplex MIMO Small-Cell Networks: Performance Analysis
Full-duplex small-cell relays with multiple antennas constitute a core
element of the envisioned 5G network architecture. In this paper, we use
stochastic geometry to analyze the performance of wireless networks with
full-duplex multiple-antenna small cells, with particular emphasis on the
probability of successful transmission. To achieve this goal, we additionally
characterize the distribution of the self-interference power of the full-duplex
nodes. The proposed framework reveals useful insights on the benefits of
full-duplex with respect to half-duplex in terms of network throughput
RCFD: A Novel Channel Access Scheme for Full-Duplex Wireless Networks Based on Contention in Time and Frequency Domains
In the last years, the advancements in signal processing and integrated
circuits technology allowed several research groups to develop working
prototypes of in-band full-duplex wireless systems. The introduction of such a
revolutionary concept is promising in terms of increasing network performance,
but at the same time poses several new challenges, especially at the MAC layer.
Consequently, innovative channel access strategies are needed to exploit the
opportunities provided by full-duplex while dealing with the increased
complexity derived from its adoption. In this direction, this paper proposes
RTS/CTS in the Frequency Domain (RCFD), a MAC layer scheme for full-duplex ad
hoc wireless networks, based on the idea of time-frequency channel contention.
According to this approach, different OFDM subcarriers are used to coordinate
how nodes access the shared medium. The proposed scheme leads to efficient
transmission scheduling with the result of avoiding collisions and exploiting
full-duplex opportunities. The considerable performance improvements with
respect to standard and state-of-the-art MAC protocols for wireless networks
are highlighted through both theoretical analysis and network simulations.Comment: Submitted at IEEE Transactions on Mobile Computing. arXiv admin note:
text overlap with arXiv:1605.0971
On the Outage Probability of the Full-Duplex Interference-Limited Relay Channel
In this paper, we study the performance, in terms of the asymptotic error
probability, of a user which communicates with a destination with the aid of a
full-duplex in-band relay. We consider that the network is
interference-limited, and interfering users are distributed as a Poisson point
process. In this case, the asymptotic error probability is upper bounded by the
outage probability (OP). We investigate the outage behavior for well-known
cooperative schemes, namely, decode-and-forward (DF) and compress-and-forward
(CF) considering fading and path loss. For DF we determine the exact OP and
develop upper bounds which are tight in typical operating conditions. Also, we
find the correlation coefficient between source and relay signals which
minimizes the OP when the density of interferers is small. For CF, the
achievable rates are determined by the spatial correlation of the
interferences, and a straightforward analysis isn't possible. To handle this
issue, we show the rate with correlated noises is at most one bit worse than
with uncorrelated noises, and thus find an upper bound on the performance of
CF. These results are useful to evaluate the performance and to optimize
relaying schemes in the context of full-duplex wireless networks.Comment: 30 pages, 4 figures. Final version. To appear in IEEE JSAC Special
Issue on Full-duplex Wireless Communications and Networks, 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
Analysis of Statistical QoS in Half Duplex and Full Duplex Dense Heterogeneous Cellular Networks
Statistical QoS provisioning as an important performance metric in analyzing
next generation mobile cellular network, aka 5G, is investigated. In this
context, by quantifying the performance in terms of the effective capacity, we
introduce a lower bound for the system performance that facilitates an
efficient analysis. Based on the proposed lower bound, which is mainly built on
a per resource block analysis, we build a basic mathematical framework to
analyze effective capacity in an ultra dense heterogeneous cellular network. We
use our proposed scalable approach to give insights about the possible
enhancements of the statistical QoS experienced by the end users if
heterogeneous cellular networks migrate from a conventional half duplex to an
imperfect full duplex mode of operation. Numerical results and analysis are
provided, where the network is modeled as a Matern point process. The results
demonstrate the accuracy and computational efficiency of the proposed scheme,
especially in large scale wireless systems. Moreover, the minimum level of self
interference cancellation for the full duplex system to start outperforming its
half duplex counterpart is investigated.Comment: arXiv admin note: substantial text overlap with arXiv:1604.0058
Upper Bounds to the Performance of Cooperative Traffic Relaying in Wireless Linear Networks
Wireless networks with linear topology, where nodes generate their own traffic and relay other nodes' traffic, have attracted increasing attention. Indeed, they well represent sensor networks monitoring paths or streets, as well as multihop networks for videosurveillance of roads or vehicular traffic. We study the performance limits of such network systems when (i) the nodes' transmissions can reach receivers farther than one-hop distance from the sender, (ii) the transmitters cooperate in the data delivery, and (iii) interference due to concurrent transmissions is taken into account. By adopting an information-theoretic approach, we derive analytical bounds to the achievable data rate in both the cases where the nodes have full-duplex and half-duplex radios. The expressions we provide are mathematically tractable and allow the analysis of multihop networks with a large number of nodes. Our analysis highlights that increasing the number of coop- erating transmitters beyond two leads to a very limited gain in the achievable data rate. Also, for half-duplex radios, it indicates the existence of dominant network states, which have a major influence on the bound. It follows that efficient, yet simple, communication strategies can be designed by considering at most two cooperating transmitters and by letting half-duplex nodes operate according to the aforementioned dominant state
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