Pushing the Linearity Limits of a Digital Polar Transmitter

Mohsen Hashemi; Morteza S. Alavi; Leo C.N. De Vreede

doi:10.23919/EuMIC.2018.8539964

Pushing the Linearity Limits of a Digital Polar Transmitter

Mohsen Hashemi, Morteza S. Alavi, Leo C.N. De Vreede

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

5 Citations (Scopus)

Abstract

The maximum achievable linearity of a digital polar transmitter (DPTX) is mainly constrained by two RF-DAC associated nonidealities; namely, aliasing of sampling spectral replicas (SSR) of the AM and PM signals, and the presence of nonuniform quantization noise. In this work, using DPTX hardware linearization, in combination with PM SSR filtering and iterative learning control (ILC) algorithm improved by look-up tables (LUT), a CMOS DPTX is linearized close to its theoretical ACPR and EVM limits as predicted by its resolution. Using the ILC technique as underlying basis, an effective real-time direct-learning digital predistortion (DPD) technique is proposed. Measurement results show -60/-53 dBc ACPR and -60/-47 dB EVM using the ILC algorithm for 16/64 MHz OFDM signals, and -55/-48 dBc ACPR and -50/-44 dB EVM using the proposed DPD for 16/64 MHz OFDM signals. To the best of author's knowledge, this is the highest linearity reported for a DPTX operating with wideband signals.

Original language	English
Title of host publication	EuMIC 2018 - 2018 13th European Microwave Integrated Circuits Conference
Place of Publication	Piscataway, NJ, USA
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Pages	174-177
Number of pages	4
ISBN (Electronic)	978-2-87487-052-1
ISBN (Print)	978-1-5386-5286-2
DOIs	https://doi.org/10.23919/EuMIC.2018.8539964
Publication status	Published - 2018
Event	13th European Microwave Integrated Circuits Conference, EuMIC 2018 - Madrid, Spain Duration: 24 Sept 2018 → 25 Sept 2018

Conference

Conference	13th European Microwave Integrated Circuits Conference, EuMIC 2018
Country/Territory	Spain
City	Madrid
Period	24/09/18 → 25/09/18

Keywords

Digital polar transmitter
DPD
quantization noise
RF - DAC
sampling spectral replica

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10.23919/EuMIC.2018.8539964

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title = "Pushing the Linearity Limits of a Digital Polar Transmitter",

abstract = "The maximum achievable linearity of a digital polar transmitter (DPTX) is mainly constrained by two RF-DAC associated nonidealities; namely, aliasing of sampling spectral replicas (SSR) of the AM and PM signals, and the presence of nonuniform quantization noise. In this work, using DPTX hardware linearization, in combination with PM SSR filtering and iterative learning control (ILC) algorithm improved by look-up tables (LUT), a CMOS DPTX is linearized close to its theoretical ACPR and EVM limits as predicted by its resolution. Using the ILC technique as underlying basis, an effective real-time direct-learning digital predistortion (DPD) technique is proposed. Measurement results show -60/-53 dBc ACPR and -60/-47 dB EVM using the ILC algorithm for 16/64 MHz OFDM signals, and -55/-48 dBc ACPR and -50/-44 dB EVM using the proposed DPD for 16/64 MHz OFDM signals. To the best of author's knowledge, this is the highest linearity reported for a DPTX operating with wideband signals.",

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Hashemi, M, Alavi, MS & De Vreede, LCN 2018, Pushing the Linearity Limits of a Digital Polar Transmitter. in EuMIC 2018 - 2018 13th European Microwave Integrated Circuits Conference., 8539964, Institute of Electrical and Electronics Engineers (IEEE), Piscataway, NJ, USA, pp. 174-177, 13th European Microwave Integrated Circuits Conference, EuMIC 2018, Madrid, Spain, 24/09/18. https://doi.org/10.23919/EuMIC.2018.8539964

Pushing the Linearity Limits of a Digital Polar Transmitter. / Hashemi, Mohsen; Alavi, Morteza S.; De Vreede, Leo C.N.
EuMIC 2018 - 2018 13th European Microwave Integrated Circuits Conference. Piscataway, NJ, USA: Institute of Electrical and Electronics Engineers (IEEE), 2018. p. 174-177 8539964.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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N2 - The maximum achievable linearity of a digital polar transmitter (DPTX) is mainly constrained by two RF-DAC associated nonidealities; namely, aliasing of sampling spectral replicas (SSR) of the AM and PM signals, and the presence of nonuniform quantization noise. In this work, using DPTX hardware linearization, in combination with PM SSR filtering and iterative learning control (ILC) algorithm improved by look-up tables (LUT), a CMOS DPTX is linearized close to its theoretical ACPR and EVM limits as predicted by its resolution. Using the ILC technique as underlying basis, an effective real-time direct-learning digital predistortion (DPD) technique is proposed. Measurement results show -60/-53 dBc ACPR and -60/-47 dB EVM using the ILC algorithm for 16/64 MHz OFDM signals, and -55/-48 dBc ACPR and -50/-44 dB EVM using the proposed DPD for 16/64 MHz OFDM signals. To the best of author's knowledge, this is the highest linearity reported for a DPTX operating with wideband signals.

AB - The maximum achievable linearity of a digital polar transmitter (DPTX) is mainly constrained by two RF-DAC associated nonidealities; namely, aliasing of sampling spectral replicas (SSR) of the AM and PM signals, and the presence of nonuniform quantization noise. In this work, using DPTX hardware linearization, in combination with PM SSR filtering and iterative learning control (ILC) algorithm improved by look-up tables (LUT), a CMOS DPTX is linearized close to its theoretical ACPR and EVM limits as predicted by its resolution. Using the ILC technique as underlying basis, an effective real-time direct-learning digital predistortion (DPD) technique is proposed. Measurement results show -60/-53 dBc ACPR and -60/-47 dB EVM using the ILC algorithm for 16/64 MHz OFDM signals, and -55/-48 dBc ACPR and -50/-44 dB EVM using the proposed DPD for 16/64 MHz OFDM signals. To the best of author's knowledge, this is the highest linearity reported for a DPTX operating with wideband signals.

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ER -

Pushing the Linearity Limits of a Digital Polar Transmitter

Abstract

Conference

Keywords

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Energy Efficient and Intrinsically Linear Digital Polar Transmitters

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