IEICE TRANSACTIONS on Communications
Asymmetrical Waveform Compensation for Concurrent Dual-Band 1-bit Band-Pass Delta-Sigma Modulator with a Quasi-Elliptic Filter
Summary :
The 1-bit band-pass delta-sigma modulator (BP-DSM) achieves high resolution if it uses an oversampling technique. This method can generate concurrent dual-band RF signals from a digitally modulated signal using a 1-bit digital pulse train. It was previously reported that the adjacent channel leakage ratio (ACLR) deteriorates owing to the asymmetrical waveform created by the pulse transition mismatch error of the rising and falling waveforms in the time domain and that the ACLR can be improved by distortion compensation. However, the reported distortion compensation method can only be performed for single-band transmission, and it fails to support multi-band transmission because the asymmetrical waveform compensated signal extends over a wide frequency range and is itself a harmful distortion outside the target band. Unfortunately, the increase of out-of-band power causes the BP-DSM unstable. We therefore propose a distortion compensator for a concurrent dual-band 1-bit BP-DSM that consists of a noise transfer function with a quasi-elliptic filter that can control the out-of-band gain frequency response against out-of-band oscillation. We demonstrate that dual-band LTE signals, each with 40MHz (2×20MHz) bandwidth, at 1.5 and 3.0GHz, can be compensated concurrently for spurious distortion under various combinations of rising and falling times and ACLR of up to 48dB, each with 120MHz bandwidth, including the double sided adjacent channels and next adjacent channels, is achieved.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E101-B No.6 pp.1352-1358
- Publication Date
- 2018/06/01
- Publicized
- 2017/12/13
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.2017EBP3216
- Type of Manuscript
- PAPER
- Category
- Transmission Systems and Transmission Equipment for Communications
Authors
Takashi MAEHATA
Sumitomo Electric Industries
Suguru KAMEDA
Tohoku University
Noriharu SUEMATSU
Tohoku University
Keyword
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Takashi MAEHATA, Suguru KAMEDA, Noriharu SUEMATSU, "Asymmetrical Waveform Compensation for Concurrent Dual-Band 1-bit Band-Pass Delta-Sigma Modulator with a Quasi-Elliptic Filter" in IEICE TRANSACTIONS on Communications,
vol. E101-B, no. 6, pp. 1352-1358, June 2018, doi: 10.1587/transcom.2017EBP3216.
Abstract: The 1-bit band-pass delta-sigma modulator (BP-DSM) achieves high resolution if it uses an oversampling technique. This method can generate concurrent dual-band RF signals from a digitally modulated signal using a 1-bit digital pulse train. It was previously reported that the adjacent channel leakage ratio (ACLR) deteriorates owing to the asymmetrical waveform created by the pulse transition mismatch error of the rising and falling waveforms in the time domain and that the ACLR can be improved by distortion compensation. However, the reported distortion compensation method can only be performed for single-band transmission, and it fails to support multi-band transmission because the asymmetrical waveform compensated signal extends over a wide frequency range and is itself a harmful distortion outside the target band. Unfortunately, the increase of out-of-band power causes the BP-DSM unstable. We therefore propose a distortion compensator for a concurrent dual-band 1-bit BP-DSM that consists of a noise transfer function with a quasi-elliptic filter that can control the out-of-band gain frequency response against out-of-band oscillation. We demonstrate that dual-band LTE signals, each with 40MHz (2×20MHz) bandwidth, at 1.5 and 3.0GHz, can be compensated concurrently for spurious distortion under various combinations of rising and falling times and ACLR of up to 48dB, each with 120MHz bandwidth, including the double sided adjacent channels and next adjacent channels, is achieved.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2017EBP3216/_p
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@ARTICLE{e101-b_6_1352,
author={Takashi MAEHATA, Suguru KAMEDA, Noriharu SUEMATSU, },
journal={IEICE TRANSACTIONS on Communications},
title={Asymmetrical Waveform Compensation for Concurrent Dual-Band 1-bit Band-Pass Delta-Sigma Modulator with a Quasi-Elliptic Filter},
year={2018},
volume={E101-B},
number={6},
pages={1352-1358},
abstract={The 1-bit band-pass delta-sigma modulator (BP-DSM) achieves high resolution if it uses an oversampling technique. This method can generate concurrent dual-band RF signals from a digitally modulated signal using a 1-bit digital pulse train. It was previously reported that the adjacent channel leakage ratio (ACLR) deteriorates owing to the asymmetrical waveform created by the pulse transition mismatch error of the rising and falling waveforms in the time domain and that the ACLR can be improved by distortion compensation. However, the reported distortion compensation method can only be performed for single-band transmission, and it fails to support multi-band transmission because the asymmetrical waveform compensated signal extends over a wide frequency range and is itself a harmful distortion outside the target band. Unfortunately, the increase of out-of-band power causes the BP-DSM unstable. We therefore propose a distortion compensator for a concurrent dual-band 1-bit BP-DSM that consists of a noise transfer function with a quasi-elliptic filter that can control the out-of-band gain frequency response against out-of-band oscillation. We demonstrate that dual-band LTE signals, each with 40MHz (2×20MHz) bandwidth, at 1.5 and 3.0GHz, can be compensated concurrently for spurious distortion under various combinations of rising and falling times and ACLR of up to 48dB, each with 120MHz bandwidth, including the double sided adjacent channels and next adjacent channels, is achieved.},
keywords={},
doi={10.1587/transcom.2017EBP3216},
ISSN={1745-1345},
month={June},}
Copy
TY - JOUR
TI - Asymmetrical Waveform Compensation for Concurrent Dual-Band 1-bit Band-Pass Delta-Sigma Modulator with a Quasi-Elliptic Filter
T2 - IEICE TRANSACTIONS on Communications
SP - 1352
EP - 1358
AU - Takashi MAEHATA
AU - Suguru KAMEDA
AU - Noriharu SUEMATSU
PY - 2018
DO - 10.1587/transcom.2017EBP3216
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E101-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 2018
AB - The 1-bit band-pass delta-sigma modulator (BP-DSM) achieves high resolution if it uses an oversampling technique. This method can generate concurrent dual-band RF signals from a digitally modulated signal using a 1-bit digital pulse train. It was previously reported that the adjacent channel leakage ratio (ACLR) deteriorates owing to the asymmetrical waveform created by the pulse transition mismatch error of the rising and falling waveforms in the time domain and that the ACLR can be improved by distortion compensation. However, the reported distortion compensation method can only be performed for single-band transmission, and it fails to support multi-band transmission because the asymmetrical waveform compensated signal extends over a wide frequency range and is itself a harmful distortion outside the target band. Unfortunately, the increase of out-of-band power causes the BP-DSM unstable. We therefore propose a distortion compensator for a concurrent dual-band 1-bit BP-DSM that consists of a noise transfer function with a quasi-elliptic filter that can control the out-of-band gain frequency response against out-of-band oscillation. We demonstrate that dual-band LTE signals, each with 40MHz (2×20MHz) bandwidth, at 1.5 and 3.0GHz, can be compensated concurrently for spurious distortion under various combinations of rising and falling times and ACLR of up to 48dB, each with 120MHz bandwidth, including the double sided adjacent channels and next adjacent channels, is achieved.
ER -
English
