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Noise Impact on the Identification of DigitalPredistorter Parameters in the Indirect LearningArchitecture
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för elektronik, matematik och naturvetenskap, Elektronik.ORCID-id: 0000-0003-1183-6666
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för elektronik, matematik och naturvetenskap, Elektronik.ORCID-id: 0000-0001-8460-6509
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för elektronik, matematik och naturvetenskap, Elektronik.
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för elektronik, matematik och naturvetenskap, Elektronik.ORCID-id: 0000-0003-2887-049X
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2012 (Engelska)Ingår i: 2012 Swedish Communication Technologies Workshop (Swe-CTW), IEEE conference proceedings, 2012, s. 36-39Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The indirect learning architecture (ILA) is the mostused methodology for the identification of Digital Pre-distorter(DPD) functions for nonlinear systems, particularly for highpower amplifiers. The ILA principle works in black box modelingrelying on the inversion of input and output signals of thenonlinear system, such that the inverse is estimated. This paperpresents the impact of disturbances, such as noise in the DPDidentification. Experiments were performed with a state-of-artDoherty power amplifier intended for base station operationin current telecommunication wireless networks. As expected,a degradation in the performance of the DPD (measured innormalized mean square error (NMSE)) is found in our experiments.However, adjacent channel power ratio (ACPR) canbe a misleading figure of merit showing improvement in theperformance for wrongly estimated DPD functions.

Ort, förlag, år, upplaga, sidor
IEEE conference proceedings, 2012. s. 36-39
Nyckelord [en]
Digital Predistortion, Noise Impact, Indirect learning architecture
Nationell ämneskategori
Signalbehandling Telekommunikation
Identifikatorer
URN: urn:nbn:se:hig:diva-13508DOI: 10.1109/Swe-CTW.2012.6376285Scopus ID: 2-s2.0-84871878986ISBN: 978-1-4673-4763-1 (tryckt)OAI: oai:DiVA.org:hig-13508DiVA, id: diva2:575195
Konferens
2012 Swedish Communication Technologies Workshop (Swe-CTW)
Tillgänglig från: 2013-01-24 Skapad: 2012-12-07 Senast uppdaterad: 2018-03-13Bibliografiskt granskad
Ingår i avhandling
1. Digital Compensation Techniques for Transmitters in Wireless Communications Networks
Öppna denna publikation i ny flik eller fönster >>Digital Compensation Techniques for Transmitters in Wireless Communications Networks
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Since they appeared, wireless technologies have deeply transformed our society. Today, wireless internet access and other wireless applications demandincreasingly more traffic. However, the continuous traffic increase can be unbearableand requires rethinking and redesigning the wireless technologies inmany different aspects. Aiming to respond to the increasing needs of wirelesstraffic, we are witnessing a rapidly evolving wireless technology scenario.This thesis addresses various aspects of the transmitters used in wireless communications.Transmitters present several hardware (HW) impairments thatcreate distortions, polluting the radio spectrum and decreasing the achievabletraffic in the network. Digital platforms are now flexible, robust and cheapenough to enable compensation of HW impairments at the digital base-bandsignal. This has been coined as ’dirty radio’. Dirty radio is expected in future transmitters where HW impairments may arise to reduce transmitter cost or to enhance power efficiency. This thesis covers the software (SW) compensation schemes of dirty radio developed for wireless transmitters. As describedin the thesis, these schemes can be further enhanced with knowledge of thespecific signal transmission or scenarios, e.g., developing cognitive digital compensationschemes. This can be valuable in today’s rapidly evolving scenarioswhere multiple signals may co-exist, sharing the resources at the same radiofrequency (RF) front-end. In the first part, this thesis focuses on the instrumentation challenges andHWimpairments encountered at the transmitter. A synthetic instrument (SI)that performs network analysis is designed to suit the instrumentation needs.Furthermore, how to perform nonlinear network analysis using the developedinstrument is discussed. Two transmitter HW impairments are studied: themeasurement noise and the load impedance mismatch at the transmitter, asis their coupling with the state-of-the-art digital compensation techniques.These two studied impairments are inherent to measurement systems and areexpected in future wireless transmitters. In the second part, the thesis surveys the area of behavioral modeling and digital compensation techniques for wireless transmitters. Emphasis is placed on low computational complexity techniques. The low complexity is motivated by a predicted increase in the number of transmitters deployed in the network, from base stations (BS), access points and hand-held devices. A modeling methodology is developed that allows modeling transmitters to achieve both reduced computational complexity and low modeling error. Finally, the thesis discusses the emerging architectures of multi-channel transmittersand describes their digital compensation techniques. It revises the MIMOVolterra series formulation to address the general modeling problem anddrafts possible solutions to tackle its dimensionality. In the framework of multi-channel transmitters, a technique to compensate nonlinear multi-carrier satellite transponders is presented. This technique is cognitive because it uses the frequency link planning and the pulse-shaping filters of the individual carriers. This technique shows enhanced compensation ability at reduced computational complexity compared to the state-of-the-art techniques and enables the efficient operation of satellite transponders.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2015. s. xiii, 63
Serie
TRITA-EE, ISSN 1653-5146 ; 2015:017
Nyckelord
Digital compensation, MIMO, wireless communications, satellite, Volterra, Amplfiers, HW effects
Nationell ämneskategori
Telekommunikation Kommunikationssystem
Forskningsämne
Informations- och kommunikationsteknik
Identifikatorer
urn:nbn:se:hig:diva-19393 (URN)978-91-7595-540-7 (ISBN)
Disputation
2015-06-15, Sal 99131, Kungsbäcksvägen 47, Gävle, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2015-05-27 Skapad: 2015-05-27 Senast uppdaterad: 2018-03-13Bibliografiskt granskad

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