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This paper presents the design of a Class AB power amplifier operating at a frequency band of 3.4 GHz–3.7 GHz for LTE base station applications. The proposed design is targeted for a compact, low cost, high efficiency, and good linearity features. It based on GaN HEMT CGH40006P device manufactured by Wolfspeed/Cree. The design procedure and assessment of the presented power amplifier are described...
Speaker recognition has been developed over many years and it comes with many different methods. MFCC is one of more the successful methods due to it being generally modeled on the human auditory system. It represents high success rate of recognition and strong robustness against noise in the lower frequency regions. However, in the higher frequency regions, it captures speaker characteristics information...
In this paper, a Verilog-AMS based methodology for automated verification is discussed. This solution is geared towards aiding the verification of behavioral models, which designers are tasked with when developing or editing a schematic. Up to now the conventional way to verify the operation of a model and how much it mimics the operation of a schematic is to visually inspect the output signals between...
Conventionally, a fractional-N synthesizer is simulated using a closed-loop behavioral model and the simulations can be very time-consuming. With the analysis by Perrott et al., a more straightforward model, namely the feed-forward model, for the fractional-N frequency synthesizer is available. The feedforward model simulations provide quick, relatively accurate evaluation of fractional-N synthesizer...
In the field of autonomous drone or micro air vehicle (MAV) research, much of the existing literature focuses on novel approaches to MAV automation and navigation. Whilst discovering these new approaches has scientific merit, these works rarely focus on the impact that the deployment of such systems have in terms of the operational time, power consumption or efficiency of the MAV. This work sets out...
Structured light techniques have received increased attention for depth estimation as they are robust and accurate. In this paper, we propose a method for camera-projector calibration which is required for structured light based depth estimation. We also propose enhancements to the existing hierarchical orthogonal coding (HOC) technique. The proposed space calibration technique is simple and fast...
Wireless Personal Area Networks (WPAN) allow for the implementation of applications such as home automation, remote control services, near-field technologies and personal health care management. Security is a critical requirement of the standards and protocols for these environments. One suite of layered protocols within WPAN is ZigBee. ZigBee is a low bit rate protocol utilised in Wireless Sensor...
Mobile devices are widely used today for speech communication. The environments in which these devices are used are widely varied and often the level of background noise in the speaker's environment can be significant. The purpose of speech enhancement is to reduce the level of background noise, ideally to such a level that it is not noticed by the listener. While speech enhancement algorithms can...
Delivering software for the Cloud represents a challenge for both micro teams and Small Medium Enterprises (SMEs), in part due to the rapid release methods adopted and the numerous ways in which software defects can be detected. We study field defect detection rates in a framework where these rates are used to refocus in-house test resources. Using an enterprise dataset, we address the question of...
The majority of analog and digital integrated circuits with built in crystal oscillator use the Gated Pierce design where the oscillator is built around a single CMOS inverting gate. In most applications that require a high level of precision and stability of the performances versus Process, Voltage and Temperature (PVT) variations, this design is not suitable. The inverter cell itself is very sensitive...
In this paper, we present a novel spectrum mapping method — Continuous Frequency Warping and Magnitude Scaling (CFWMS) for voice conversion under the Joint Density Gaussian Mixture Model (JDGMM) framework. JDGMM is a mature clustering technique that models the joint probability density of speech signals from paired speakers. The conventional JDGMM-based approaches morph the spectral features via least...
The spectrum sensing strategy plays a vital role in Amplify-Forward (AF)-Cognitive Radio Networks (CRNs). However, AF-CRN cannot obtain maximal throughput, when existing sensing strategies are applied to AF-CRNs. In this paper, we present a superposition approach in AF-CRNs, in which firstly a Secondary User (SU) extends its sensing time until right before the beginning of its reporting time slot,...
This paper reports a new improved Clapp VCO topology designed in 180 nm Si-Ge HBT technology for operations around 5 GHz. The designed topology uses a series-tuned resonator, a back-to-back series varactor configuration for tuning the output frequency and a filtering tail current designed for shunting to ground the second harmonic noise component. At the supply voltage of 3.3V, and across Process,...
Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
Recent years have witnessed tremendous advances in wearable technology with many applications ranging from health and fitness, sports, security, and more recently augmented reality. Classical body area networks have been reduced to small, wearable devices such as smart watches where signal acquisition is accompanied by processing or streaming to a more powerful device such as a smart phone (or “fog”),...
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