Tri-Phasing Modulation for Efficient and Wideband Radio Transmitters

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Tri-Phasing Modulation for Efficient and Wideband Radio Transmitters. / Lemberg, Jerry; Martelius, Mikko; Kosunen, Marko; Roverato, Enrico; Stadius, Kari; Anttila, Lauri; Valkama, Mikko; Ryynanen, Jussi.

In: IEEE Transactions on Circuits and Systems I: Regular Papers, Vol. 65, No. 9, 09.2018, p. 3085-3098.

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Lemberg, Jerry ; Martelius, Mikko ; Kosunen, Marko ; Roverato, Enrico ; Stadius, Kari ; Anttila, Lauri ; Valkama, Mikko ; Ryynanen, Jussi. / Tri-Phasing Modulation for Efficient and Wideband Radio Transmitters. In: IEEE Transactions on Circuits and Systems I: Regular Papers. 2018 ; Vol. 65, No. 9. pp. 3085-3098.

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@article{966579bc77ba47ac9a7c1ee904218a21,
title = "Tri-Phasing Modulation for Efficient and Wideband Radio Transmitters",
abstract = "In this paper, we show that amplitude transitions that are inherent to the multilevel outphasing radio transmitter architecture distort the transmitted signal due to time-domain discontinuities. In order to address this challenge, we propose a new transmitter architecture called tri-phasing which avoids discontinuities in signal waveforms and thus achieves significantly better linearity than multilevel outphasing. The output waveform in tri-phasing can be made continuous by representing the baseband signal with three components. One of the three components is amplified by discrete amplitude steps, whereas the other two are used to compensate the instantaneous shift in the output waveform due to the discrete amplitude step and to provide fine amplitude resolution. An implementation of the tri-phasing transmitter requires three phase modulators and additional digital signal processing. The system-level simulations performed in this paper demonstrate that the ACLR of a multilevel outphasing transmitter with 4 amplitude levels and 10-bit phase resolution is limited to -48 dBc, when simulated with a 100 MHz carrier-aggregated LTE downlink signal at 2.46 GHz carrier frequency. The proposed tri-phasing transmitter achieves -58 dBc ACLR with the same simulation parameters, indicating that continuous amplitude transitions can significantly improve the transmitter linearity.",
keywords = "CMOS., digital, DIPM, interpolation, Outphasing, phase modulation, phase modulator, switch-mode PA, transmitter, tri-phasing",
author = "Jerry Lemberg and Mikko Martelius and Marko Kosunen and Enrico Roverato and Kari Stadius and Lauri Anttila and Mikko Valkama and Jussi Ryynanen",
note = "| openaire: EC/H2020/704947/EU//ADVANTAG5",
year = "2018",
month = "9",
doi = "10.1109/TCSI.2018.2821269",
language = "English",
volume = "65",
pages = "3085--3098",
journal = "IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS",
issn = "1549-8328",
number = "9",

}

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TY - JOUR

T1 - Tri-Phasing Modulation for Efficient and Wideband Radio Transmitters

AU - Lemberg, Jerry

AU - Martelius, Mikko

AU - Kosunen, Marko

AU - Roverato, Enrico

AU - Stadius, Kari

AU - Anttila, Lauri

AU - Valkama, Mikko

AU - Ryynanen, Jussi

N1 - | openaire: EC/H2020/704947/EU//ADVANTAG5

PY - 2018/9

Y1 - 2018/9

N2 - In this paper, we show that amplitude transitions that are inherent to the multilevel outphasing radio transmitter architecture distort the transmitted signal due to time-domain discontinuities. In order to address this challenge, we propose a new transmitter architecture called tri-phasing which avoids discontinuities in signal waveforms and thus achieves significantly better linearity than multilevel outphasing. The output waveform in tri-phasing can be made continuous by representing the baseband signal with three components. One of the three components is amplified by discrete amplitude steps, whereas the other two are used to compensate the instantaneous shift in the output waveform due to the discrete amplitude step and to provide fine amplitude resolution. An implementation of the tri-phasing transmitter requires three phase modulators and additional digital signal processing. The system-level simulations performed in this paper demonstrate that the ACLR of a multilevel outphasing transmitter with 4 amplitude levels and 10-bit phase resolution is limited to -48 dBc, when simulated with a 100 MHz carrier-aggregated LTE downlink signal at 2.46 GHz carrier frequency. The proposed tri-phasing transmitter achieves -58 dBc ACLR with the same simulation parameters, indicating that continuous amplitude transitions can significantly improve the transmitter linearity.

AB - In this paper, we show that amplitude transitions that are inherent to the multilevel outphasing radio transmitter architecture distort the transmitted signal due to time-domain discontinuities. In order to address this challenge, we propose a new transmitter architecture called tri-phasing which avoids discontinuities in signal waveforms and thus achieves significantly better linearity than multilevel outphasing. The output waveform in tri-phasing can be made continuous by representing the baseband signal with three components. One of the three components is amplified by discrete amplitude steps, whereas the other two are used to compensate the instantaneous shift in the output waveform due to the discrete amplitude step and to provide fine amplitude resolution. An implementation of the tri-phasing transmitter requires three phase modulators and additional digital signal processing. The system-level simulations performed in this paper demonstrate that the ACLR of a multilevel outphasing transmitter with 4 amplitude levels and 10-bit phase resolution is limited to -48 dBc, when simulated with a 100 MHz carrier-aggregated LTE downlink signal at 2.46 GHz carrier frequency. The proposed tri-phasing transmitter achieves -58 dBc ACLR with the same simulation parameters, indicating that continuous amplitude transitions can significantly improve the transmitter linearity.

KW - CMOS.

KW - digital

KW - DIPM

KW - interpolation

KW - Outphasing

KW - phase modulation

KW - phase modulator

KW - switch-mode PA

KW - transmitter

KW - tri-phasing

UR - http://www.scopus.com/inward/record.url?scp=85045333599&partnerID=8YFLogxK

U2 - 10.1109/TCSI.2018.2821269

DO - 10.1109/TCSI.2018.2821269

M3 - Article

VL - 65

SP - 3085

EP - 3098

JO - IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS

JF - IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS

SN - 1549-8328

IS - 9

ER -

ID: 19098054