# IET Communications

## Filter Results

Displaying Results 1 - 15 of 15
• ### Optimal beamforming for dual-hop MIMO AF relay networks with imperfect CSI

Publication Year: 2018, Page(s):115 - 124
| |PDF (1850 KB)

In this study, the authors take into account the imperfect channel state information for beamforming (BF) scheme in a dual-hop multiple-input multiple-output (MIMO) amplify-and-forward (AF) relay network. Since the overall performance has been decided by the signal-to-interference-plus-noise ratio (SINR) at the destination, the authors derive the optimal BF weights that maximise the SINR at the de... View full abstract»

• ### Power allocation based on beamforming in cooperative cognitive radio networks with arbitrary number of secondary users

Publication Year: 2018, Page(s):125 - 135
| |PDF (1738 KB)

In this study, a new beamforming and power allocation method for cooperative cognitive radio (CR) networks is proposed. The proposed method can be deployed in systems with one primary user (PU) and arbitrary number of secondary users (SUs). By using transmit beamforming in both PU and SUs, multiple transmission with limited interference effect in the receivers can be attained. SUs get permission t... View full abstract»

• ### RTCP: reliable topology construction protocol of bluetooth hybrid single-hop and multi-hop networks

Publication Year: 2018, Page(s):136 - 143
| |PDF (2689 KB)

In this work, a reliable topology construction protocol (RTCP) called Dual-Ring Tree scatternet with a self-routing algorithm is proposed for hybrid single-hop/multi-hop situations. To benefit from the advantages of the hybrid scenarios, a dual-ring subnet is presented as a single-hop solution for one dense area, while a tree-shaped subnet is designed as a multi-hop solution for other sparse areas... View full abstract»

• ### Retransmission scheme for contention-based data transmission systems

Publication Year: 2018, Page(s):144 - 151
| |PDF (2000 KB)

In conventional schedule-based wireless transmission system, frequent interactions between devices and access networks lead to significant signalling overhead, and thus limit the development of low-latency applications. Contention-based data transmission (CBDT) is widely used as a promising solution to address the above issues. In this study, the authors propose a detection-based retransmission sc... View full abstract»

• ### Non-linear transceiver design for multiple-input–multiple-output interference channel with statistical channel state information error

Publication Year: 2018, Page(s):152 - 156
| |PDF (1286 KB)

This study focuses on robust Tomlinson-Harashima precoding transceiver design for multi-cell multiple-input-multiple-output interference channel with statistical channel state information error. The objective is formulated to minimise the maximum per-user mean square error (MSE) with per-transmitter power constraint. Since the problem is not jointly convex, an approximated method is proposed. The ... View full abstract»

• ### Robust and efficient beam training scheme for millimetre wave indoor communications

Publication Year: 2018, Page(s):157 - 168
| |PDF (5527 KB)

Antenna beamforming is a key enabler for the deployment of reliable millimetre wave communication systems. Indoor millimetre wave network standards have adopted a multi-stage codebook-based beam training protocol with an objective to reduce the number of preamble transmissions required to identify the optimum transmit-receive beam pair. Multi-stage beam training schemes entail moderate search comp... View full abstract»

• ### Efficient WMMSE beamforming for 5G mmWave cellular networks exploiting the effect of antenna array geometries

Publication Year: 2018, Page(s):169 - 178
| |PDF (3247 KB)

Millimetre wave (mmWave) transmission is considered as one of the potential technologies in fifth generation (5G) cellular networks that could allocate more bandwidth to support the rapid growth of mobile data services. However, mmWave signals experience large path loss which can overcome by employing directional beamforming with high-dimensional antenna arrays. In this study, a downlink multiuser... View full abstract»

• ### $alpha$α-Fair resource allocation in non-orthogonal multiple access systems

Publication Year: 2018, Page(s):179 - 183
| |PDF (1077 KB)

A non-orthogonal multiple access (NOMA) system is now considered as a promising radio access technique for nextgeneration networks owing to its benefits, e.g. spectral efficiency improvement. Due to the successive interference cancellation order at receivers, fairness among users in NOMA may not be guaranteed. In this study, the authors focus on α-fair resource allocation in NOMA. The compl... View full abstract»

• ### Power line communications under Rayleigh fading and Nakagami noise: novel insights on the MIMO and multi-hop techniques

Publication Year: 2018, Page(s):184 - 191
| |PDF (1866 KB)

This work targets a comprehensive understanding of the impact of the serial-relaying and multiple-input-multiple-output (MIMO) fading mitigation techniques on the performance of indoor power line communication (PLC) systems. While these techniques were studied extensively under additive Gaussian noise, we aim at highlighting the implications of Nakagami-like noise on the achievable performance lev... View full abstract»

• ### Spatial characteristics of the massive MIMO channel based on indoor measurement at 1.4725 GHz

Publication Year: 2018, Page(s):192 - 197
| |PDF (2580 KB)

Massive multiple-input-multiple-output (MIMO) is acknowledged as a key technology for the fifth generation of wireless communication systems, theoretically proved to be of higher throughput, better robustness, superior spectrum- and energy-efficiency with a general presumption that the channels tend to pairwise orthogonal with the increasing of the asymmetrical antenna pairs. Recently, more and mo... View full abstract»

• ### NN-based IDF demodulator in band-limited communication system

Publication Year: 2018, Page(s):198 - 204
| |PDF (2296 KB)

To meet the spectrum requirement in the future wireless communication system, the m-ary phase position shift keying as a type of the spectrally efficient modulation has been considered in this study. However, the inter-symbol interference (ISI), the waveform distortion and the non-white noise are introduced by the band-pass infinite impulse response filters, which is adopted to limit the si... View full abstract»

• ### Outage performance for amplify-and-forward two-hop multiple-access channel with noisy relay and interference-limited destination

Publication Year: 2018, Page(s):205 - 213
| |PDF (1572 KB)

The common outage performance of an amplify-and-forward two-hop two-user channel is studied in the presence of multiple independent interferers at the destination. First, the exact integral form expression of the common outage probability is derived. Then, in order to decrease the computation complexity, a closed-form approximation of the common outage probability is derived. Finally, the asymptot... View full abstract»

• ### Performance analysis and optimisation for edge connection of JSCC system based on double protograph LDPC codes

Publication Year: 2018, Page(s):214 - 219
| |PDF (2012 KB)

For a joint source-channel coding system based on double protograph low-density parity-check codes, the exchange of extrinsic information through edge connection between the source code and channel code is essential for good performance. In this study, the relationship between the performance and edge connection in the tanner graph is analysed and it has never been seen in the literature to the au... View full abstract»

• ### Optimal power allocation for bi-directional full duplex underlay cognitive radio networks

Publication Year: 2018, Page(s):220 - 227
| |PDF (4044 KB)

Cognitive radio and full duplex transmissions are regarded as two effective techniques to improve the spectral efficiency. By combining the two promising techniques, the problem of power allocation for bi-directional full duplex underlay cognitive spectrum sharing is studied. To protect the primary transmission, consider both the instantaneous and statistical channel state information to adjust th... View full abstract»

• ### Robust multipath channel estimation in the presence of impulsive noise

Publication Year: 2018, Page(s):228 - 235
| |PDF (2386 KB)

Power-line communications (PLCs) endure a severe transmission channel distortion due to Gaussian noise, impulsive noise, and multipath self-interference. Conventional transmission models with white Gaussian noise would be very inappropriate and impair the necessary channel estimation drastically to the PLC receivers. In this study, a statistical model for impulsive noise, namely Middleton Class A ... 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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