NDLI: Multilevel Coded Modulation With Reduced Latency Decoding Based on Novel Set Partitioning for APSK

Content Provider	IEEE Xplore Digital Library
Author	Yoda, D. Ochiai, H.
Copyright Year	1963
Abstract	We address the use of a multilevel coding (MLC) to the amplitude phase-shift keying (APSK) modulations that consist of multiple PSK rings of different radii with a distinct number of constellation points. Such modulations have been adopted in the satellite broadcasting standards since they have a significant advantage over commonly used square-type quadrature amplitude modulations; their signals exhibit lower peak-to-average power ratio and thus enhance the power amplifier efficiency at the transmitter. A common low-complexity approach for decoding of MLC is the multi-stage decoding (MSD). However, MSD in general leads to severe latency at the decoder since the binary decisions on the higher levels should wait for those of the lower levels. Furthermore, this latency issue is even more salient for APSK signaling due to its circular nature of constellations that does not allow its decomposition into in-phase and quadrature components (i.e., I-Q decomposition). Therefore, in this paper we introduce a new MLC design for APSK that enables the decoder to reduce its latency without any increase in terms of complexity. The proposed approach consists of a novel labeling with an unconventional set partitioning that allows the detector to make use of I-Q decomposition. Specifically, the proposed set partitioning results in a quadrature-PSK constellation at the penultimate level, which can be decomposed into a pair of separately decodable binary-PSK constellations at the final level. The resulting decoder consists of a combination of MSD and parallel independent decoding that can be implemented with lower latency. The simulation results together with the theoretical analyses demonstrate that the reduction of not only the decoding latency but also the complexity in bit metric calculation can be achieved without noticeable degradation in terms of error performance compared to the conventional set partitioning approach.
Sponsorship	IEEE Broadcast Technology Society
Starting Page	674
Ending Page	684
Page Count	11
File Size	1356691
File Format	PDF
ISSN	00189316
Volume Number	61
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Decoding Phase shift keying Complexity theory Peak to average power ratio Digital video broadcasting Turbo codes turbo code Amplitude phase-shift keying (APSK) digital video broadcasting-satellite-second generation (DVB-S2) in-phase and quadrature (I-Q) decomposition multilevel coded modulation (MLC)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

Sl.	Authority	Responsibilities	Communication Details
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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