Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Minimum-EVM N-continuous OFDM
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.ORCID-id: 0000-0002-9225-8150
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.ORCID-id: 0000-0003-0413-4826
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
Antal upphovsmän: 32016 (Engelska)Ingår i: 2016 IEEE International Conference on Communications (ICC): Kuala Lumpur, 22-27 May 2016, Piscataway, NJ: IEEE Communications Society, 2016, artikel-id 7511164Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The N-continuous precoder for the suppression ofOOB emission in OFDM systems that minimizes the EVM isintroduced. We show that the minimum in-band interference dueto the introduced precoding approach is 3 dB less than the inbandinterference of existing N-continuous precoders. Moreover,we introduce a novel practical block precoder that approachesthe performance of the suggested optimal precoder. We analyzethe spectrum of the OFDM signal after block precoding, the inbandinterference due to block precoding and the effect of blockprecoding on the BER. The price to pay for block precoding isthe computational complexity that grows linearly with the blocksize.

Ort, förlag, år, upplaga, sidor
Piscataway, NJ: IEEE Communications Society, 2016. artikel-id 7511164
Nyckelord [en]
OFDM, spectrum, out of band emission, in-band interference, Information technology - Signal processing
Nyckelord [sv]
Informationsteknik - Signalbehandling
Nationell ämneskategori
Signalbehandling
Forskningsämne
Signalbehandling; Möjliggörande IKT (FOI)
Identifikatorer
URN: urn:nbn:se:ltu:diva-31163DOI: 10.1109/ICC.2016.7511164ISI: 000390993203035Scopus ID: 2-s2.0-84981306982Lokalt ID: 54014940-6cf4-4e51-974e-dcfdcf2fed88ISBN: 978-1-4799-6664-6 (digital)OAI: oai:DiVA.org:ltu-31163DiVA, id: diva2:1004393
Konferens
IEEE International Conference on Communications : 23/05/2016 - 27/05/2016
Anmärkning

Godkänd; 2016; 20151105 (jaavan)

Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2018-12-07Bibliografiskt granskad
Ingår i avhandling
1. Spectrally Precoded OFDM-Design and Analysis
Öppna denna publikation i ny flik eller fönster >>Spectrally Precoded OFDM-Design and Analysis
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[sv]
Spektral förkodning i OFDM-design och analys
Abstract [en]

Despite shifting towards mm-wave bands, the sub-6 GHz band will continue to be a fundamental spectral band in 5G. However, the severe congestion in this band makes a well-constrained spectrum a critical requirementof 5G. A well-constrained spectrum means that the communications regimes should dwell within their dedicated spectral bands and do not interfere with other systems working on neighboring bands. Consequently, the communi-cations community seeks convenient modulation schemes.

The 5G standards have already defined cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) as the modulation scheme for most of the sub-6 GHz band. However, the high out-of-band (OOB) emission phe-nomenon in OFDM is unfavorable for some regimes operating in 5G. Therefore, to legitimize OFDM in all 5G regimes, we need to suppress the OFDM OOB emission.

Since the discontinuous nature of the OFDM signal is the main reason forthe high OOB emission, one solution is to render the discontinuous OFDM signal continuous. Two factors control this discontinuity: the physical shape of the modulated signal and the correlation of the data symbols that modulate the OFDM signal.

While most traditional approaches focus on reshaping the OFDM signal to render it continuous, in this work, we give our attention to the spectral precoding approaches. These approaches manipulate the correlation of the data symbols to control the high OOB emission in OFDM.

After almost ten years of analytical and theoretical study of the spectralprecoding approaches in the literature, we believe it is time to investigate the practicality and ability of spectral precoding methods to compete with traditional approaches. Consequently, we check whether spectral precoding satisfies the spectral requirements of LTE measures. We analyze the precoders' implementation complexity and provide methodologies to reduce it. We design practical spectral precoders that match with the practical OFDM transmitters, and we study spectral precoding extensibility toward MIMO (and massive MIMO) systems.

Moreover, in this work, we introduce the first proof-of-concept prototype of spectrally precoded OFDM. In the prototype, we use software-defined radios (SDRs) to perform a real-time examination of how spectral precoding improves the spectral containment of OFDM systems.

Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2019
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Nyckelord
OFDM, spectral precoding, out of band emission, 5G
Nationell ämneskategori
Signalbehandling
Forskningsämne
Signalbehandling
Identifikatorer
urn:nbn:se:ltu:diva-71971 (URN)978-91-7790-282-9 (ISBN)978-91-7790-283-6 (ISBN)
Disputation
2019-02-19, E632, Luleå tekniska universitet, Luleå, 13:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Vetenskapsrådet
Tillgänglig från: 2018-12-07 Skapad: 2018-12-07 Senast uppdaterad: 2019-01-31Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Personposter BETA

Mohamad, MedhatNilsson, RickardBeek, Jaap van de

Sök vidare i DiVA

Av författaren/redaktören
Mohamad, MedhatNilsson, RickardBeek, Jaap van de
Av organisationen
Signaler och system
Signalbehandling

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
isbn
urn-nbn

Altmetricpoäng

doi
isbn
urn-nbn
Totalt: 317 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf