# IET Communications

## Filter Results

Displaying Results 1 - 20 of 20
• ### Generalised benders decomposition-based load optimisation in cellular and public WLAN interworking network

Publication Year: 2017, Page(s):1823 - 1830
| | PDF (3429 KB)

To realise load optimisation in cellular and public wireless local area network (WLAN) interworking network, a fairness preferred throughput maximisation (FPTM) optimisation model and a particular algorithm for it named joint UE-AN association and resource allocation optimisation based on generalised benders decomposition are proposed in the study. The derived solution will give guidance on UE's a... View full abstract»

• ### Graph colouring based fractional frequency reuse for enterprise femtocell networks

Publication Year: 2017, Page(s):1831 - 1837
| | PDF (3906 KB)

In this study, the authors propose a novel dynamic channel assignment scheme called graph colouring based fractional frequency reuse (GC-FFR) to improve system performance for the downlink of enterprise femtocell networks based on orthogonal frequency division multiple access with frequency division duplex. In order to mitigate co-tier interference from neighbour femtocell access points, the propo... View full abstract»

• ### Givens rotation-based QR decomposition for MIMO systems

Publication Year: 2017, Page(s):1838 - 1845
| | PDF (4143 KB)

QR decomposition is an essential operation in various detection algorithms utilised in multiple-input multiple-output (MIMO) wireless communication systems. This study presents a Givens rotation-based QR decomposition for $4\times 4$4×4<... View full abstract»

• ### Multiuser energy harvesting relaying system with direct links

Publication Year: 2017, Page(s):1846 - 1852
| | PDF (1887 KB)

In this study, the authors study an energy harvesting relaying system with multiuser, in which the relay node is capable of harvesting radio-frequency energy and retransmitting data with harvested energy by employing the power splitting strategy. The joint impact of direct and relaying links is taken into account in the process of user selection, and furthermore exploited for data transmission by ... View full abstract»

Publication Year: 2017, Page(s):1853 - 1856
| | PDF (1139 KB)

This study gives a general bit-error rate expression, using Gil-Palaez lemma-based approach, of a M branch equal gain combining (EGC) receiver over two-wave diffused power (TWDP) fading channels. The expressions obtained are evaluated numerically and the results are verified using Monte Carlo simulation. Also the impact of the fading parameters δ and K on th... View full abstract»

• ### Performance of improved energy detector with cognitive radio mobility and imperfect channel state information

Publication Year: 2017, Page(s):1857 - 1863
| | PDF (2581 KB)

A cooperative cognitive radio (CR) network with multiple secondary users (or CRs) is considered. Each CR consists of an arbitrary M number of antennas. For spectrum sensing, at each CR, an improved energy detector with selection combining mechanism is assumed. Moreover, the impact of secondary user mobility on the performance of spectrum sensing is analysed. Specifically, the expr... View full abstract»

• ### Energy-efficient precoding design for cloud radio access networks

Publication Year: 2017, Page(s):1864 - 1870
| | PDF (2861 KB)

In cloud radio access network, a baseband unit (BBU) performs the baseband processing for a cluster of low-power low-cost remote radio heads (RRHs) that are connected to the BBU through low-latency fronthaul links. In this study, the authors study the optimisation of two energy-efficient compression and precoding strategies which take transmit power constraint, fronthaul capacity constraint and us... View full abstract»

• ### Outage of relay simultaneous wireless information and power transfer with GSC and finite storage in Nakagami-m fading

Publication Year: 2017, Page(s):1871 - 1881
| | PDF (3724 KB)

In this study, a wireless powered dual-hop relay system, which consists of a source, a destination and a relay that is equipped with $N_{\rm R}$NR View full abstract»

• ### Hybrid precoding in point-to-point massive multiple-input multiple-output systems based on normalised matrix adaptive method

Publication Year: 2017, Page(s):1882 - 1885
| | PDF (1678 KB)

The potential of millimetre wave frequencies band has motivated the study of large-scale antenna arrays to improve the spectrum efficiency of massive multiple-input multiple-output wireless communications systems. However, conventional fully digital precoding schemes, which require one radio frequency (RF) chain for each antenna, are cost prohibitive and have high-power consumption. To address the... View full abstract»

• ### Secrecy outage analysis and power allocation for decode-and-forward relay systems

Publication Year: 2017, Page(s):1886 - 1894
| | PDF (2365 KB)

The decode-and-forward multi-relay system with the presence of an eavesdropper is researched in this study. Two widely used transmission schemes are considered, namely, the best-relay selection scheme and the all-relay-based beamforming scheme. To be specific, the former scheme adopts only the single best relay among all the candidate relays that have succeeded in decoding the source signal to ass... View full abstract»

• ### Fault tolerance events ordering by aging learning in wireless sensor and actuator networks

Publication Year: 2017, Page(s):1895 - 1902
| | PDF (5470 KB)

In wireless sensor and actuator networks, none of the existed events ordering algorithms addressed the network delay and failure link jointly. In ordering by double confirmation (OBDC), the process of events ordering cannot be completed, if the failure link existed in network. In temporal event ordering with fault tolerance (TEOFT), the rate of correct events ordering decreased dramatically if the... View full abstract»

• ### Dynamic interference-limited relay sharing in cognitive radio networks by using hierarchical modulation

Publication Year: 2017, Page(s):1903 - 1912
| | PDF (3159 KB)

Sharing a relay in cognitive radio (CR) networks in order to enhance the secondary user's (SU's) performance in an interference-limited scheme is investigated. It is assumed, by utilising hierarchical modulation, a shared relay is used simultaneously between both primary user (PU) and SU. The proposed scheme relies on both power adaptation and rate scheduling. Based on channel side information and... View full abstract»

• ### Efficient protocol header recovery algorithm based on iterative decoding between layers

Publication Year: 2017, Page(s):1913 - 1919
| | PDF (3309 KB)

The iterative header recovery algorithm holds the potential of improving the performance of wireless communication, yet it has to face the challenge of reducing the high complexity. In this study, a method of constructing a candidate set around the observation sequence is proposed to approximate the original code space, by exploiting the channel measurement information. This approximation method n... View full abstract»

• ### Echo state network-based radio signal strength prediction for wireless communication in Northern Namibia

Publication Year: 2017, Page(s):1920 - 1926
| | PDF (3249 KB)

A method for predicting radio signal strength using echo state networks (ESNs) is proposed and applied to three different locations in Northern Namibia. This method aims at providing a better way for radio signal strength prediction, which leads to improvements in wireless communication planning, design and analysis. Its performance is compared with the support vector regression (SVR) method optim... View full abstract»

• ### Genetic algorithm based fault tolerant clustering in wireless sensor network

Publication Year: 2017, Page(s):1927 - 1932
| | PDF (1566 KB)

In wireless sensor network (WSN), during fault detection and recovery, average energy loss, and message loss occurs including the link failure. Also, the number of faulty nodes and the traffic overhead is increased with the size of WSN. In order to overcome this issue, in this study, a cluster-based fault tolerance technique using genetic algorithm is proposed. Here the network is clustered accord... View full abstract»

• ### BCoPS: an energy-efficient routing protocol with coverage preservation

Publication Year: 2017, Page(s):1933 - 1940
| | PDF (3099 KB)

In wireless sensor networks, an energy-efficient routing protocol plays a crucial role in extending the lifetime of the network. In order to realise this, an optimal coverage-preserving scheme (OCoPS) has been proposed by Boukerche et al. in 2005 as an add-on to the Low-energy Adaptive Clustering Hierarchy (LEACH) protocol. This scheme operates alongside another coverage-preservin... View full abstract»

• ### Performance of multicarrier cooperative communication systems over underwater acoustic channels

Publication Year: 2017, Page(s):1941 - 1951
| | PDF (2819 KB)

Multicarrier transmission in the form of orthogonal frequency division multiplexing (OFDM) is an efficient method to handle inter-symbol interference resulting from the frequency selectivity of the underwater acoustic (UWA) channels. OFDM can be further combined with cooperative transmission to benefit from the spatial diversity advantages and improve the performance over conventional point-to-poi... View full abstract»

• ### Low-complexity multi-service power optimisation algorithm based on MOS models

Publication Year: 2017, Page(s):1952 - 1960
| | PDF (3149 KB)

In this study, the authors consider the power optimisation based on the MOS (mean of score) models of different services over multi-user femtocell systems. They first formulate a mathematic model to minimise the total power consumption, subject to the MOS requirements and the network resource constraint. To solve the formulated problem, they first propose an optimal power allocation (OPA) scheme, ... View full abstract»

• ### Secrecy performance analysis of SIMO underlay cognitive radio systems with outdated CSI

Publication Year: 2017, Page(s):1961 - 1969
| | PDF (3192 KB)

This study investigates the secrecy outage performance of a single-input multiple-output underlay cognitive radio network (CRN) with outdated channel state information (CSI). The confidential messages are transmitted from transmitter to the destination, while a multi-antenna eavesdropper exists. The maximal ratio combining and selection combining schemes are utilised at the receivers to improve th... View full abstract»

• ### Class of novel broadband chaos-based coherent communication systems

Publication Year: 2017, Page(s):1970 - 1984
| | PDF (6041 KB)

As opposed to chaotic communication systems where a message signal directly modulates a broadband chaotic signal, it is also possible to indirectly utilise a chaotic signal to form a chaos-based communication system. This study proposes a class of novel broadband chaos-based coherent communication systems and demonstrates that their theoretical probability of error expressions match those of their... View full abstract»

## Aims & Scope

IET Communications covers the theory and practice of systems, networks and applications involving line, mobile radio, satellite and optical technologies for telecommunications, and Internet and multimedia communications.

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