The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
O modulador delta-sigma passa-banda de 1 bit (BP-DSM) atinge alta resolução se usar uma técnica de sobreamostragem. Este método pode gerar sinais de RF de banda dupla simultâneos a partir de um sinal modulado digitalmente usando um trem de pulso digital de 1 bit. Foi relatado anteriormente que a taxa de vazamento de canal adjacente (ACLR) se deteriora devido à forma de onda assimétrica criada pelo erro de incompatibilidade de transição de pulso das formas de onda ascendentes e descendentes no domínio do tempo e que o ACLR pode ser melhorado pela compensação de distorção. No entanto, o método de compensação de distorção relatado só pode ser executado para transmissão de banda única e não suporta transmissão multibanda porque o sinal compensado de forma de onda assimétrica se estende por uma ampla faixa de frequência e é em si uma distorção prejudicial fora da banda alvo. Infelizmente, o aumento da potência fora da banda torna o BP-DSM instável. Portanto, propomos um compensador de distorção para um BP-DSM de 1 bit de banda dupla concorrente que consiste em uma função de transferência de ruído com um filtro quase elíptico que pode controlar a resposta de frequência de ganho fora de banda contra oscilação fora de banda . Demonstramos que sinais LTE de banda dupla, cada um com largura de banda de 40 MHz (2 × 20 MHz), em 1.5 e 3.0 GHz, podem ser compensados simultaneamente para distorções espúrias sob várias combinações de tempos de subida e descida e ACLR de até 48dB, cada um com 120 MHz. largura de banda, incluindo os canais adjacentes de dupla face e os próximos canais adjacentes, é alcançada.
Takashi MAEHATA
Sumitomo Electric Industries
Suguru KAMEDA
Tohoku University
Noriharu SUEMATSU
Tohoku University
The copyright of the original papers published on this site belongs to IEICE. Unauthorized use of the original or translated papers is prohibited. See IEICE Provisions on Copyright for details.
Copiar
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
Copiar
@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},}
Copiar
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 -