Digitally controlled oscillator gain estimation for RF-DPLLs in 4G LTE polar transmitters

Tobias Buckel; Stefan Tertinek; Ram Sunil Kanumalli; Thomas Mayer; Christian Wicpalek; Robert Weigel; Thomas Ussmüller

doi:10.1109/ISCAS.2016.7539001

Digitally controlled oscillator gain estimation for RF-DPLLs in 4G LTE polar transmitters

Tobias Buckel, Stefan Tertinek, Ram Sunil Kanumalli, Thomas Mayer, Christian Wicpalek, Robert Weigel, Thomas Ussmüller

Institute of Signal Processing

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

Abstract

The gain of a digitally controlled oscillator (DCO) represents a crucial parameter for wideband phase modulators utilized in polar transmitters supporting SC-FDMA in LTE uplink. Accurate normalization of the DCO gain is necessary for a two-point modulation of a RF digital phase-locked loop (DPLL) to not degrade the in-band modulation quality and out-of-band emissions. The DCO gain can change due to process, voltage and temperature effects and therefore has to be estimated during runtime. A common way to estimate the DCO gain is by minimizing the residual error due to phase modulation signal content present in the error feedback signal of the DPLL control loop. This paper derives a simple discrete time, single-rate model of the DCO gain estimation and investigates the behavior and impact on modulation quality for different resource block (RB) allocation scenarios found in LTE uplink transmission. It is shown that the DCO gain estimation is sensitive to modulation signals with contiguous, sparse RB allocation and problems may arise in certain transmission scenarios.

Original language	English
Title of host publication	Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS 2016)
Publisher	IEEE
Pages	2130-2133
Number of pages	4
DOIs	https://doi.org/10.1109/ISCAS.2016.7539001
Publication status	Published - May 2016

Publication series

Name	IEEE International Conference on Circuits and Systems
ISSN (Print)	2379-447X

Fields of science

202040 Transmission technology
202 Electrical Engineering, Electronics, Information Engineering
202015 Electronics
202022 Information technology
202023 Integrated circuits
202028 Microelectronics
202030 Communication engineering
202034 Control engineering
202037 Signal processing

JKU Focus areas

Computation in Informatics and Mathematics
Mechatronics and Information Processing

Access to Document

10.1109/ISCAS.2016.7539001

Cite this

Buckel, T., Tertinek, S., Kanumalli, R. S., Mayer, T., Wicpalek, C., Weigel, R., & Ussmüller, T. (2016). Digitally controlled oscillator gain estimation for RF-DPLLs in 4G LTE polar transmitters. In Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS 2016) (pp. 2130-2133). Article 7539001 (IEEE International Conference on Circuits and Systems). IEEE. https://doi.org/10.1109/ISCAS.2016.7539001

@inproceedings{8f610d1583824bee8f06ea93b23bcc5f,

title = "Digitally controlled oscillator gain estimation for RF-DPLLs in 4G LTE polar transmitters",

abstract = "The gain of a digitally controlled oscillator (DCO) represents a crucial parameter for wideband phase modulators utilized in polar transmitters supporting SC-FDMA in LTE uplink. Accurate normalization of the DCO gain is necessary for a two-point modulation of a RF digital phase-locked loop (DPLL) to not degrade the in-band modulation quality and out-of-band emissions. The DCO gain can change due to process, voltage and temperature effects and therefore has to be estimated during runtime. A common way to estimate the DCO gain is by minimizing the residual error due to phase modulation signal content present in the error feedback signal of the DPLL control loop. This paper derives a simple discrete time, single-rate model of the DCO gain estimation and investigates the behavior and impact on modulation quality for different resource block (RB) allocation scenarios found in LTE uplink transmission. It is shown that the DCO gain estimation is sensitive to modulation signals with contiguous, sparse RB allocation and problems may arise in certain transmission scenarios.",

author = "Tobias Buckel and Stefan Tertinek and Kanumalli, \{Ram Sunil\} and Thomas Mayer and Christian Wicpalek and Robert Weigel and Thomas Ussm{\"u}ller",

year = "2016",

month = may,

doi = "10.1109/ISCAS.2016.7539001",

language = "English",

series = "IEEE International Conference on Circuits and Systems",

publisher = "IEEE",

pages = "2130--2133",

booktitle = "Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS 2016)",

}

Buckel, T, Tertinek, S, Kanumalli, RS, Mayer, T, Wicpalek, C, Weigel, R & Ussmüller, T 2016, Digitally controlled oscillator gain estimation for RF-DPLLs in 4G LTE polar transmitters. in Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS 2016)., 7539001, IEEE International Conference on Circuits and Systems, IEEE, pp. 2130-2133. https://doi.org/10.1109/ISCAS.2016.7539001

Digitally controlled oscillator gain estimation for RF-DPLLs in 4G LTE polar transmitters. / Buckel, Tobias; Tertinek, Stefan; Kanumalli, Ram Sunil et al.
Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS 2016). IEEE, 2016. p. 2130-2133 7539001 (IEEE International Conference on Circuits and Systems).

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

TY - GEN

T1 - Digitally controlled oscillator gain estimation for RF-DPLLs in 4G LTE polar transmitters

AU - Buckel, Tobias

AU - Tertinek, Stefan

AU - Kanumalli, Ram Sunil

AU - Mayer, Thomas

AU - Wicpalek, Christian

AU - Weigel, Robert

AU - Ussmüller, Thomas

PY - 2016/5

Y1 - 2016/5

N2 - The gain of a digitally controlled oscillator (DCO) represents a crucial parameter for wideband phase modulators utilized in polar transmitters supporting SC-FDMA in LTE uplink. Accurate normalization of the DCO gain is necessary for a two-point modulation of a RF digital phase-locked loop (DPLL) to not degrade the in-band modulation quality and out-of-band emissions. The DCO gain can change due to process, voltage and temperature effects and therefore has to be estimated during runtime. A common way to estimate the DCO gain is by minimizing the residual error due to phase modulation signal content present in the error feedback signal of the DPLL control loop. This paper derives a simple discrete time, single-rate model of the DCO gain estimation and investigates the behavior and impact on modulation quality for different resource block (RB) allocation scenarios found in LTE uplink transmission. It is shown that the DCO gain estimation is sensitive to modulation signals with contiguous, sparse RB allocation and problems may arise in certain transmission scenarios.

AB - The gain of a digitally controlled oscillator (DCO) represents a crucial parameter for wideband phase modulators utilized in polar transmitters supporting SC-FDMA in LTE uplink. Accurate normalization of the DCO gain is necessary for a two-point modulation of a RF digital phase-locked loop (DPLL) to not degrade the in-band modulation quality and out-of-band emissions. The DCO gain can change due to process, voltage and temperature effects and therefore has to be estimated during runtime. A common way to estimate the DCO gain is by minimizing the residual error due to phase modulation signal content present in the error feedback signal of the DPLL control loop. This paper derives a simple discrete time, single-rate model of the DCO gain estimation and investigates the behavior and impact on modulation quality for different resource block (RB) allocation scenarios found in LTE uplink transmission. It is shown that the DCO gain estimation is sensitive to modulation signals with contiguous, sparse RB allocation and problems may arise in certain transmission scenarios.

U2 - 10.1109/ISCAS.2016.7539001

DO - 10.1109/ISCAS.2016.7539001

M3 - Conference proceedings

T3 - IEEE International Conference on Circuits and Systems

SP - 2130

EP - 2133

BT - Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS 2016)

PB - IEEE

ER -

Buckel T, Tertinek S, Kanumalli RS, Mayer T, Wicpalek C, Weigel R et al. Digitally controlled oscillator gain estimation for RF-DPLLs in 4G LTE polar transmitters. In Proceedings of the IEEE International Symposium on Circuits and Systems (ISCAS 2016). IEEE. 2016. p. 2130-2133. 7539001. (IEEE International Conference on Circuits and Systems). doi: 10.1109/ISCAS.2016.7539001