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Filter Bank Multi-Carrier Modulation
KTH, School of Electrical Engineering (EES), Communication Theory.
2015 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

During the last years, multi-carrier modulations have raised a particular interest due

to their high spectral efficiency and the possible assumption of flat frequency fading.

The most broadly used multi-carrier modulation is the CP-OFDM. It allows very simple

equalizations methods and MIMO transcoders which keep orthogonality between

carrier waveforms. However, it does not allow any waveform flexibility and is not fully

spectrally efficient. Due to the low waveform flexibility its performance is quite limited

in scenarios like the frequency division multiple accesses. In order to improve its

performance in this case, it is important to have a multi-carrier modulation with the possibility

to have a waveform well localized in time and frequency. Grey analysis shows

that the only way to get both full spectral efficiency and waveforms well localized in

both time and frequency domain is to give up the orthogonality in the complex field.

Using filter bank multi-carrier (FBMC) with Offset-QAM (OQAM) is one combination

which achieves this task. In this thesis, we study this modulation, how it is possible

to efficiently modulate and demodulate it but also the transcoder (pre-coder, equalizer

or both) that can be used when transmitting through multi-tap and MIMO channels.

Another modulation, based on FBMC with OQAM, cyclic offset-QAM (COQAM)

tries to make a tradeoff between spectral efficiency and simplicity of the equalization

and transcoding methods. In this thesis, FBMC based modulation schemes are tested

through different scenario: unsynchronized multi-users, unsynchronized uplink, multitaps

channels, SIMO, MISO and MIMO channels. COQAM is tested with some of

these scenario when it is considered as relevant to test it.

Abstract [sv]

Under senare år har intresset för multi-carrier modulering ökat på grund av dess höga

spektrumeffektivitet under antagandet om slät frekvensfäding. Den vanligaste multicarrier

moduleringen i praktiken är CP-OFDM. Denna modulering tillåter användning

av enkla equalizeringsmetoder och MIMO transkodare vilket behåller ortogonalitet

mellan vågformerna. Däremot tillåter den inte någon flexibilitet i val av vågform och är

inte heller helt spektraleffektiv. På grund av inflexibilitet i val av vågform är dess prestanda

begränsad under till exempel frekvensmultiplexing (FDMA). För att förbättra

prestandan hos CP-OFDM ¨ar det viktigt att ha en modulering med möjlighet att en

vågform begränsad i både tid och frekvens. Grey analys visar att det enda sättet att

uppnå full spektrumeffektivitet, i kombination med vågformer som är väl begränsade

i både tid och frekvens, är att ge upp ortogonaliteten i komplexa fältet. Filter Bank

Multi-Carrier (FBMC) med Offset-QAM (OQAM) är ett alternativ som uppnår detta.

I den här avhandlingen studeras just denna modulation, hur det är möjligt att göra effektiv

modulation och demodulation, men också hur dess equalizer, pre-kodare och

transkoder används vid multi-tap och MIMO-kanaler. En annan modulation, baserad

på FBMC med OQAM, är cyclisk offset-QAM (COQAM). COQAM försöker göra

avvägning mellan spektral effektivitet och enkelhet av utjämnings- och transkodrar

metoder. I den här avhandlingen studeras både FBMC-baserade modulationer och

COQAM i en rad olika scenarios: osynkroniserade multianvändare, osynkroniserad

upplänk, flera vägar kanaler, SIMO, MISO och MIMO-kanaler.

Place, publisher, year, edition, pages
2015. , 78 p.
Series
EES Examensarbete / Master Thesis, XR-EE-KT 2015:003
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-168383OAI: oai:DiVA.org:kth-168383DiVA: diva2:816032
External cooperation
Ericsson Research
Educational program
Master of Science in Engineering - Electrical Engineering
Examiners
Available from: 2015-06-02 Created: 2015-06-02 Last updated: 2015-06-02Bibliographically approved

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