NDLI: Compensation of imperfections caused by digital pulse width modulation using baseband injection

Content Provider	IEEE Xplore Digital Library
Author	Yu, Xin Markert, Daniel
Copyright Year	2015
Description	Author affiliation: Bell-Labs, Alcatel-Lucent, Lorenzstrasse 10 70435 Stuttgart, Germany (Yu, Xin; Markert, Daniel)
Abstract	All-digital transmitter is a hot topic since a few years. One of the key elements of all-digital transmitters is the modulator, which modulates the baseband IQ signal onto a carrier frequency in the form of digital binary signals. The combination of delta-sigma modulation and pulse width modulation is a very strong candidate. However, the regular sampled pulse width modulator introduces non-linear distortions and images also known as aliasing effects. Due to these non-linear distortions and images, the signal integrity is violated especially when the power spectral density of the baseband input signal is not symmetrical around DC. In this paper, we propose a baseband injection method with low complexity to pre-compensate these unwanted emissions. This novel method does not have to run at the operating frequency of pulse width modulator but can run at a much lower frequency. Moreover, each term of the non-linear distortions and images can be individually compensated without mutual influence. In Matlab simulations we show that all the compensated non-linear distortions and images are suppressed by over 20 dB and disappear below the noise floor of delta-sigma modulator.
Starting Page	1
Ending Page	3
File Size	537943
Page Count	3
File Format	PDF
ISBN	9781479987658
e-ISBN	9781479987672
DOI	10.1109/APMC.2015.7413220
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-12-06
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Decision support systems
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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