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A concurrent, tunable, tri-band, single chain radio receiver for 5G radio access networks is evaluated. The three concurrent bands are independently tunable over a frequency range from 600 MHz to 2.7 GHz. A hardware-in-the-loop test-bed provides a system level evaluation of the proposed receiver using direct RF digitization. The test-bed emulates a 5G heterogeneous network supporting three wideband,...
This invited paper considers a key next step in the design of radio architectures aimed at supporting low energy consumption in 5G heterogeneous radio access networks. State-of-the-art mobile radios usually require one RF transceiver per standard, each working separately at any given time. Software defined radios, while spanning a wide range of standards and frequency bands, also work separately at...
In this paper, a compact tuneable dual-band slot antenna operating over the frequency range from 560 MHz to 1 GHz is presented and evaluated through a hardware-in-the-loop test-bed. The co-existence of high order modulation schemes is investigated in Digital Terrestrial Television (DTT) and low Long-Term Evolution (LTE) bands. Error Vector Magnitude (EVM) results show that the proposed antenna can...
In order to meet the high data rate, low latency and high energy efficiency requirements, the future radio units must utilise the frequency spectrum available at certain geographical location efficiently with a minimum amount of hardware. This requires frequency agility and concurrent multi-standard operation capabilities at the base and mobile terminals. To utilise the TV white spaces for mobile...
Colour shift keying (CSK) is a visible light communication (VLC) modulation scheme, designed for multi-colour light emitting diodes (LEDs), standardised in IEEE 802.15.7. The standard specifies a Reed-Solomon (RS) encoder for the CSK physical layer (PHY). Currently, no investigations have been made to analyse the performance of the RS coded CSK. This paper details, that the CSK systems yield to soft...
This work presents the higher order modulation schemes for the standardised trichromatic light- emitting diode (TLED) and recently developed quad- chromatic LED (QLED) based colour shift keying (CSK), and investigates their performance over diffuse optical wireless channels with colour cross-talk, insertion losses and additive white Gaussian noise (AWGN). The performance analysis shows that the uncoded...
This paper presents a novel basestation antenna system capable of dynamically reconfiguring its azimuth beamwidth. Simulation and theoretical results show that by switching the PIN diodes' states, the azimuth beamwidth can be reconfigured from narrow (60º) to wide angle (90º). Such a design is suitable for trading cell average and cell edge throughput requirements in real time to benefit the QOS of...
Inter-cell interference (ICI) is a key limiting factor to the general performance of a multi-cell multi-user radio access network. The channel quality of cell edge users is greatly impaired by ICI owing to the fact that cell edge users are furthest away from the their serving base station and closest to the interfering base stations. As a result the Quality of Service (QoS) and energy efficiency of...
The IEEE 802.11e standard allows for contention-based quality of service (QoS) provisioning using enhanced distributed channel access (EDCA). By tuning the contention parameters for EDCA, the system can adapt to changes in the network scenario. The benefits of this adaptation include the ability to maximise the system capacity while also achieving the service differentiation necessary to provide QoS...
It is desirable that energy performance improvement is not realized at the expense of other network performance parameters. This paper investigates the trade off between energy efficiency, spectral efficiency and user QoS performance for a multi-cell multi-user radio access network. Specifically, the energy consumption ratio (ECR) and the spectral efficiency of several common frequency domain packet...
The objective of this paper is to combine the antenna downtilt selection with the cell size selection in order to reduce the overall radio frequency (RF) transmission power in the homogeneous High-Speed Packet Downlink (HSDPA) cellular radio access network (RAN). The analysis is based on the concept of small cells deployment. The energy consumption ratio (ECR) and the energy reduction gain (ERG) of...
Energy consumption in wireless networks, and in particular in cellular mobile networks, is now of major concern in respect of their potential adverse impact upon the environment and their escalating operating energy costs. The recent phenomenal growth of data services in cellular mobile networks has exacerbated the energy consumption issue and is forcing researchers to address how to design future...
High-Speed Downlink Packet Access (HSDPA) is currently in use as 3.5G operating at various transmission rates with a peak rate of 14.4MMBit/s. Turbo code with higher order modulation is used in channel coding and modulation. In this paper the extrinsic information transfer chart (EXIT chart) analysis has been applied as a tool to evaluate the performance of High Speed Downlink Packet Access (HSDPA)...
This paper presents a novel WLAN-based system configuration employing Coded Multi-Carrier Code-Division- Multiplexing technology (CMC-CDM), as a potentially superior alternative to the currently standardized Coded OFDM (COFDM) technology. To further improve the performance of the system and reduce its complexity, a new concept of Chase detection is applied at the receiver. A comprehensive investigation...
Many home networks now use 802.11 wireless local area networks (WLAN)s. The 802.11e amendment has been designed to improve quality of service (QoS) over these networks allowing for multimedia applications such as IPTV to be better supported. The H.264 video compression standard is suitable for IPTV due to its high compression and error resilience. Video packets of different slice types are of varying...
802.11 wireless local area networks are now a common feature in the home. In order to meet the quality of service (QoS) demands for the increasing number of multimedia applications on these home networks the 802.11e amendment was developed. A suitable video coding standard for these multimedia applications is H.264 due to its high compression and error resilience. In this paper we investigate how...
Many homes now have an 802.11 wireless local area network (WLAN) with a high speed internet connection. 802.11e enhanced distributed channel access (EDCA) allows for traffic prioritisation over 802.11 WLANs which can allow for the QoS demands of the increasing number of multimedia applications on the home network to be met. Providing quality of service (QoS) for delay constrained video applications...
802.11 wireless local area networks are now common in the home. The 802.11e amendment allows for quality of service (QoS) provisioning over these networks to help meet the QoS demands of the growing number of multimedia applications on these home networks. The H.264 video coding standard is suitable for most multimedia applications due to its high compression and error resilience. This paper investigates...
This paper studies the performance of a new coded multi-carrier code-division multiplexing (CMC-CDM) scheme in a wireless LAN (WLAN) context, employing different interleaving approaches. It is found that for high data rate transmission the proposed system has the potential to achieve power efficient PER performance using low complexity receivers. For example, equal gain combining (EGC) may be used...
Sensorless speed measurement of induction machines using short time Fourier transformation (STFT) is presented in this paper. The sensorless speed information of induction motors was derived from space vector angular fluctuation which is obtained from stator current by exploring the position of the current space vector in the space vector plane. By applying STFT to the space vector angular fluctuation...
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