Abstract
Multihop relaying is a fundamental technology that will enable connectivity in large-scale networks such as those encounted in Internet of Things applications. However, the end-to-end transmission rate decreases dramatically as the number of hops increases when half-duplex (HD) relaying is employed. In this paper, we investigate the outage probability and symbol-error rate for both HD and full-duplex (FD) transmission schemes in multihop networks subject to interference from randomly distributed third-party devices. We model the locations of the interfering devices as a Poisson point process. We derive a closed-form expression for the outage probability and approximations for the symbol-error rate for HD and FD transmissions employing BPSK and QPSK. The symbol-error rate results are obtained by using a Markov chain model for the multihop decode-and-forward links. This model accurately accounts for the nonlinear dynamical nature of the network, whereby erroneous symbol decoding can be “corrected” by a second erroneous decoding operation later in the network. We verify the analytical results through simulations and show the HD and FD schemes can be utilized to reduce the error-rate and outage probability of the system according to different residual self-interference levels and interferer densities. The results provide clear guidelines for implementing HD and FD in multihop networks.
Highlights
T HE emerging requirements of network ubiquity and machine intelligence that are needed to support and enhance future economic and social development have led to the Internet of Things (IoT) vision and have accelerated a number technological advances in recent years [1]
The typically high energy consumption required by Long Term Evolution-Advanced (LTE-A) is a severe obstacle to large-scale IoT deployments via cellular connectivity [1]
Outage probability is easy to compute and gives some insight into the theoretical end-to-end performance of a multihop network, it is often more desirable in practice to characterize the symbol-error rate (SER) for a chosen modulation scheme
Summary
T HE emerging requirements of network ubiquity and machine intelligence that are needed to support and enhance future economic and social development have led to the Internet of Things (IoT) vision and have accelerated a number technological advances in recent years [1]. For IoT and massive machine-type communications, the interference from other active nodes should be considered when analyzing system performance [16]. To address this issue, we will utilize stochastic geometry [17] to derive a practical and tractable analytic framework for FD multihop DF networks subject to interference from other active nodes. To the best of the authors’ knowledge, this is the first work to exploit a Markov chain model to investigate the symbol-error rate (SER) and outage probability in FD multihop DF networks in the presence of randomly located interferers.
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