Spectral Effects of Discrete-Time Amplitude Levels in Digital-Intensive Wideband Radio Transmitters

Mikko Martelius; Kari Stadius; Jerry Lemberg; Enrico Roverato; Marko Kosunen; Jussi Ryynänen; Lauri Anttila; Mikko Valkama

doi:10.1109/ISCAS.2018.8350970

Spectral Effects of Discrete-Time Amplitude Levels in Digital-Intensive Wideband Radio Transmitters

Mikko Martelius, Kari Stadius, Jerry Lemberg, Enrico Roverato, Marko Kosunen, Jussi Ryynänen, Lauri Anttila, Mikko Valkama

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

3 Citations (Scopus)

8 Downloads (Pure)

Abstract

This paper examines one source of spectral degradation in polar and multilevel outphasing transmitters. The degradation is caused by the amplitude signal appearing at the transmitter output as a baseband component, in addition to the desired RF signal. This baseband component contains sampling images and quantization noise across the spectrum. Thus, it adds noise at the signal band where it cannot be filtered and limits the achievable ACLR, particularly in wideband LTE and 5G systems. We analyze the origin of this phenomenon and related effects of system and signal parameters, and propose three design solutions for eliminating or alleviating the problem. Our analysis and simulations demonstrate that using a voltage-subtracting power combiner cancels the described degradation, potentially leading to significant improvement in spectral performance.

Original language	English
Title of host publication	2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018
Publisher	IEEE
ISBN (Electronic)	9781538648810
DOIs	https://doi.org/10.1109/ISCAS.2018.8350970
Publication status	Published - 26 Apr 2018
Publication type	A4 Article in conference proceedings
Event	IEEE International Symposium on Circuits and Systems - Florence, Italy Duration: 27 May 2018 → 30 May 2018

Publication series

Name
ISSN (Electronic)	2379-447X

Conference

Conference	IEEE International Symposium on Circuits and Systems
Country/Territory	Italy
City	Florence
Period	27/05/18 → 30/05/18

Publication forum classification

Publication forum level 1

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1109/ISCAS.2018.8350970

Spectral Effects of Discrete-Time Amplitude Levels 2018
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Accepted author manuscript, 558 KB

http://urn.fi/URN:NBN:fi:tuni-202002041829

Cite this

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title = "Spectral Effects of Discrete-Time Amplitude Levels in Digital-Intensive Wideband Radio Transmitters",

abstract = "This paper examines one source of spectral degradation in polar and multilevel outphasing transmitters. The degradation is caused by the amplitude signal appearing at the transmitter output as a baseband component, in addition to the desired RF signal. This baseband component contains sampling images and quantization noise across the spectrum. Thus, it adds noise at the signal band where it cannot be filtered and limits the achievable ACLR, particularly in wideband LTE and 5G systems. We analyze the origin of this phenomenon and related effects of system and signal parameters, and propose three design solutions for eliminating or alleviating the problem. Our analysis and simulations demonstrate that using a voltage-subtracting power combiner cancels the described degradation, potentially leading to significant improvement in spectral performance.",

author = "Mikko Martelius and Kari Stadius and Jerry Lemberg and Enrico Roverato and Marko Kosunen and Jussi Ryyn{\"a}nen and Lauri Anttila and Mikko Valkama",

note = "jufoid=86927; IEEE International Symposium on Circuits and Systems ; Conference date: 27-05-2018 Through 30-05-2018",

year = "2018",

month = apr,

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language = "English",

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booktitle = "2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018",

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Martelius, M, Stadius, K, Lemberg, J, Roverato, E, Kosunen, M, Ryynänen, J, Anttila, L & Valkama, M 2018, Spectral Effects of Discrete-Time Amplitude Levels in Digital-Intensive Wideband Radio Transmitters. in 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018., 8350970, IEEE, IEEE International Symposium on Circuits and Systems, Florence, Italy, 27/05/18. https://doi.org/10.1109/ISCAS.2018.8350970

TY - GEN

T1 - Spectral Effects of Discrete-Time Amplitude Levels in Digital-Intensive Wideband Radio Transmitters

AU - Martelius, Mikko

AU - Stadius, Kari

AU - Lemberg, Jerry

AU - Roverato, Enrico

AU - Kosunen, Marko

AU - Ryynänen, Jussi

AU - Anttila, Lauri

AU - Valkama, Mikko

N1 - jufoid=86927

PY - 2018/4/26

Y1 - 2018/4/26

N2 - This paper examines one source of spectral degradation in polar and multilevel outphasing transmitters. The degradation is caused by the amplitude signal appearing at the transmitter output as a baseband component, in addition to the desired RF signal. This baseband component contains sampling images and quantization noise across the spectrum. Thus, it adds noise at the signal band where it cannot be filtered and limits the achievable ACLR, particularly in wideband LTE and 5G systems. We analyze the origin of this phenomenon and related effects of system and signal parameters, and propose three design solutions for eliminating or alleviating the problem. Our analysis and simulations demonstrate that using a voltage-subtracting power combiner cancels the described degradation, potentially leading to significant improvement in spectral performance.

AB - This paper examines one source of spectral degradation in polar and multilevel outphasing transmitters. The degradation is caused by the amplitude signal appearing at the transmitter output as a baseband component, in addition to the desired RF signal. This baseband component contains sampling images and quantization noise across the spectrum. Thus, it adds noise at the signal band where it cannot be filtered and limits the achievable ACLR, particularly in wideband LTE and 5G systems. We analyze the origin of this phenomenon and related effects of system and signal parameters, and propose three design solutions for eliminating or alleviating the problem. Our analysis and simulations demonstrate that using a voltage-subtracting power combiner cancels the described degradation, potentially leading to significant improvement in spectral performance.

U2 - 10.1109/ISCAS.2018.8350970

DO - 10.1109/ISCAS.2018.8350970

M3 - Conference contribution

AN - SCOPUS:85057074078

BT - 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018

PB - IEEE

T2 - IEEE International Symposium on Circuits and Systems

Y2 - 27 May 2018 through 30 May 2018

ER -

Spectral Effects of Discrete-Time Amplitude Levels in Digital-Intensive Wideband Radio Transmitters

Abstract

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