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Using Intrinsic Integer Periodicity to Decompose the Volterra Structure in Multi-Channel RF Transmitters
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för elektronik, matematik och naturvetenskap, Elektronik. KTH, Stockholm, Sweden; Univ Catolica San Pablo, Arequipa, Peru.ORCID-id: 0000-0001-8460-6509
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för elektronik, matematik och naturvetenskap, Elektronik. KTH, Stockholm, Sweden.ORCID-id: 0000-0002-9352-0261
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för elektronik, matematik och naturvetenskap, Elektronik.
KTH, Stockholm, Sweden.ORCID-id: 0000-0002-2718-0262
2016 (Engelska)Ingår i: IEEE Microwave and Wireless Components Letters, ISSN 1531-1309, E-ISSN 1558-1764, Vol. 26, nr 4, s. 297-299Artikel i tidskrift (Refereegranskat) Published
Resurstyp
Text
Abstract [en]

An instrumentation, measurement and post-processing technique is presented to characterize transmitters by multiple input multiple output (MIMO) Volterra series. The MIMO Volterra series is decomposed as the sum of nonlinear single-variable self-kernels and a multi-variable cross-kernel. These kernels are identified by sample averages of the outputs using inputs of different sample periodicity. This technique is used to study the HW effects in a RF MIMO transmitter composed by input and output coupling filters (cross-talk) sandwiching a non-linear amplification stage. The proposed technique has shown to be useful in identifying the dominant effects in the transmitter structure and it can be used to design behavioral models and compensation techniques.

Ort, förlag, år, upplaga, sidor
2016. Vol. 26, nr 4, s. 297-299
Nyckelord [en]
Amplifiers, behavioral modeling, concurrent, digital predistortion, linearization, MIMO, MIMO Volterra series
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
URN: urn:nbn:se:hig:diva-21555DOI: 10.1109/LMWC.2016.2525019ISI: 000374561900025Scopus ID: 2-s2.0-84979470032OAI: oai:DiVA.org:hig-21555DiVA, id: diva2:935084
Tillgänglig från: 2016-06-10 Skapad: 2016-06-09 Senast uppdaterad: 2018-11-26Bibliografiskt granskad
Ingår i avhandling
1. Characterization and Compensation of Hardware Impairments in Transmitters for Wireless Communications
Öppna denna publikation i ny flik eller fönster >>Characterization and Compensation of Hardware Impairments in Transmitters for Wireless Communications
2018 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Increasing demands for data rate, energy efficiency and reliability in wireless communications have resulted in the introduction of radio frequency (RF) multiple input multiple output (MIMO) transmitters. However, MIMO transmitters suffer from additional crosstalk impairments along with the power amplifier (PA) and I/Q imbalance distortions observed in single input single output (SISO) transmitters. Therefore, this thesis focuses on the characterization and compensation of these hardware impairments in RF SISO and MIMO transmitters.

PA distortions are often compensated using the Volterra series, but it suffers from high computational complexity. Therefore, a non-parametric method based on density estimation has been proposed in this thesis to estimate the PA transfer function, from which pruned Volterra models can be developed. The method is validated for a Doherty PA and achieves competitive error performance at a lower complexity than its competitors.

For MIMO transmitters, a characterization technique that uses multitone excitation signals has been proposed. Multitone signals yield non-overlapping tones at the outputs of the MIMO Volterra kernels. These kernel outputs are used to identify the dominant crosstalk impairments, from which block structure and base-band behavioral models are developed. The method is validated for 2x2 and 3x3 MIMO transmitters and it is shown that the derived models achieve a better complexity accuracy trade-off than the other pruned MIMO Volterra models considered in this thesis.

Finally, the thesis presents compensation models for joint static I/Q imbalance and MIMO PA distortions based on conjugate pair and real-valued basis functions. The models are augmented with sub-sample resolution to compensate for dynamic I/Q imbalance distortions. The proposed models are validated for a 2x2 RF MIMO transmitter and achieve a better complexity accuracy trade-off than the other state-of-the-art models considered in this thesis.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2018. s. 65
Serie
TRITA-EECS-AVL ; 2018:60
Nyckelord
Power amplifier, RF transmitters, SISO, MIMO, crosstalk, Volterra series, Volterra kernels, behavioral modeling, DPD, Ramanujan sums, multitone signals, I/Q Imbalance, non-linearity, memory polynomial, density estimation, hardware impairments
Nationell ämneskategori
Signalbehandling
Identifikatorer
urn:nbn:se:hig:diva-27935 (URN)978-91-7729-924-0 (ISBN)
Disputation
2018-10-18, Hörsal 12:108, Kungsbäcksvägen 47, Gävle, 13:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2018-09-21 Skapad: 2018-09-21 Senast uppdaterad: 2018-09-24Bibliografiskt granskad

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