FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2898860821> ?p ?o ?g. }

• W2898860821 abstract "Mobile communication technologies are becoming increasingly sophisticated and have experienced rapid evolution over the last few decades, and this is especially true for the base station transmitter. In response to the ever increasing demand in communication traffic and data throughput, largely driven by video based social media platforms, both spectral and power efficient device and systems are needed to fulfil the requirements. In terms of energy consumption, the power amplifier is an important component, and although developing efficient technologies for handset equipment is important, it is the base station element of the communications system that poses the greater challenge, having to deal with many channels simultaneously, resulting in the need to linearly and efficiently amplify highly dynamic phase and amplitude modulated signals possessing very large peak-to-average power ratios, at high power levels. This unique set of challenges has led to continuous research to improve the efficiency of amplifiers that can accommodate such signals, and the Doherty architecture has now become the architecture-of-choice.However, most of the previous research studies demonstrate Doherty performance enhancement through a ‘conventional’ design approach that uses one input source and a passive power splitter to deliver power to each half of the Doherty structure. They do not emphasize the additional efficiency and other performance improvements that are possible in Doherty amplifiers when using two different, independent and phase coherent input sources, attached to the input path of both main and auxiliary amplifiers.IVThe novel research work presented in this thesis introduces an optimised design approach for Doherty amplifier architectures with individual input sources, as well as detailing a measurement architecture that is necessary to characterise such structures, using separate, phase-coherent input sources in a realistic measurement scenario. Finally, following extensive characterisation of a number of promising architectures, investigations around efficiency enhancement are focused around the adaption of gate bias applied to the auxiliary amplifier device, and identifying, for the first time, what is possible by generating different shaping functions that relate bias voltage to the magnitude of the input signal.One completely new area of research and novelty introduced in this work for example shows how choosing the right shaping function can give improved linearity and importantly linearisability by producing a flat gain over dynamic range. Note that linearisability is important, and is defined here as the term used to describe the ease with which the non-linearities of a device or power amplifier can be corrected. It is often assumed in power amplifier design that efficiency and power are the most important parameters, and that modern digital pre-distortion (DPD) techniques can easily correct any non-linearity that may result. Industry is now finding that this is not the case however, and the type and nature of the non-linearity in terms to AM-AM and AM-PM distortion is very important in determining of the degree of linearization possible." @default.
• W2898860821 created "2018-11-09" @default.
• W2898860821 creator A5074934278 @default.
• W2898860821 date "2018-09-01" @default.
• W2898860821 modified "2023-09-23" @default.
• W2898860821 title "Advanced Doherty power amplifier design for modern communication systems" @default.
• W2898860821 hasPublicationYear "2018" @default.
• W2898860821 type Work @default.
• W2898860821 sameAs 2898860821 @default.
• W2898860821 citedByCount "0" @default.
• W2898860821 crossrefType "dissertation" @default.
• W2898860821 hasAuthorship W2898860821A5074934278 @default.
• W2898860821 hasConcept C101765175 @default.
• W2898860821 hasConcept C119599485 @default.
• W2898860821 hasConcept C121332964 @default.
• W2898860821 hasConcept C127413603 @default.
• W2898860821 hasConcept C163258240 @default.
• W2898860821 hasConcept C194257627 @default.
• W2898860821 hasConcept C24326235 @default.
• W2898860821 hasConcept C2779971919 @default.
• W2898860821 hasConcept C41008148 @default.
• W2898860821 hasConcept C46362747 @default.
• W2898860821 hasConcept C62520636 @default.
• W2898860821 hasConcept C68649174 @default.
• W2898860821 hasConcept C76155785 @default.
• W2898860821 hasConceptScore W2898860821C101765175 @default.
• W2898860821 hasConceptScore W2898860821C119599485 @default.
• W2898860821 hasConceptScore W2898860821C121332964 @default.
• W2898860821 hasConceptScore W2898860821C127413603 @default.
• W2898860821 hasConceptScore W2898860821C163258240 @default.
• W2898860821 hasConceptScore W2898860821C194257627 @default.
• W2898860821 hasConceptScore W2898860821C24326235 @default.
• W2898860821 hasConceptScore W2898860821C2779971919 @default.
• W2898860821 hasConceptScore W2898860821C41008148 @default.
• W2898860821 hasConceptScore W2898860821C46362747 @default.
• W2898860821 hasConceptScore W2898860821C62520636 @default.
• W2898860821 hasConceptScore W2898860821C68649174 @default.
• W2898860821 hasConceptScore W2898860821C76155785 @default.
• W2898860821 hasLocation W28988608211 @default.
• W2898860821 hasOpenAccess W2898860821 @default.
• W2898860821 hasPrimaryLocation W28988608211 @default.
• W2898860821 hasRelatedWork W129524478 @default.
• W2898860821 hasRelatedWork W1494978188 @default.
• W2898860821 hasRelatedWork W166302771 @default.
• W2898860821 hasRelatedWork W2056624005 @default.
• W2898860821 hasRelatedWork W2187096791 @default.
• W2898860821 hasRelatedWork W2187138167 @default.
• W2898860821 hasRelatedWork W2551573460 @default.
• W2898860821 hasRelatedWork W2560969347 @default.
• W2898860821 hasRelatedWork W25897705 @default.
• W2898860821 hasRelatedWork W271372615 @default.
• W2898860821 hasRelatedWork W2726425660 @default.
• W2898860821 hasRelatedWork W2783818951 @default.
• W2898860821 hasRelatedWork W2786879635 @default.
• W2898860821 hasRelatedWork W2806470213 @default.
• W2898860821 hasRelatedWork W2940339856 @default.
• W2898860821 hasRelatedWork W3004715411 @default.
• W2898860821 hasRelatedWork W3016253956 @default.
• W2898860821 hasRelatedWork W3100300357 @default.
• W2898860821 hasRelatedWork W616548243 @default.
• W2898860821 hasRelatedWork W635388469 @default.
• W2898860821 isParatext "false" @default.
• W2898860821 isRetracted "false" @default.
• W2898860821 magId "2898860821" @default.
• W2898860821 workType "dissertation" @default.