Design and Analysis of Duplexing Modes and Forwarding Protocols for OFDM(A) Relay Links

Taneli Riihonen

Design and Analysis of Duplexing Modes and Forwarding Protocols for OFDM(A) Relay Links

Julkaisun otsikon käännös: Monihyppyisten OFDM(A)-linkkien dupleksitilojen ja välitysprotokollien kehitys ja analyysi

Taneli Riihonen

Tutkimustuotos: Doctoral Thesis › Monograph

Abstrakti

Monihyppyinen tiedonsiirto niin kutsuttujen välittimien kautta on muodostunut kehittyneeksi teknologiaksi, jolla voi toteuttaa langattomissa järjestelmissä tehokkaasti pitkiä yhteysvälejä ja suuria datanopeuksia. Tämä tutkielma keskittyy monihyppyisiin monen käyttäjän järjestelmiin, joissa signaalit käyttävät OFDM(A)-modulaatiota ("orthogonal frequency-division multiplexing" tai "- multiple access") ja välittimet ovat osa verkko-infrastruktuuria. Yleisesti ottaen tämä tutkielma selvittää kuinka välittimiä voi käyttää optimaalisesti spektri-, lähetysteho- ja prosessointirajoitusten vallitessa sekä kuinka välittimien suorittamaa signaalinkäsittelyä voi parantaa käyttämällä muita edistyneitä konsepteja kuten moniantennitekniikoita, taajuuksien uudelleenkäyttöä, tehon säätöä ja uusia vaihtoehtoja monikantoaaltoprotokollien suunnittelussa. Ensimmäinen pääaihe käsittelee dupleksitilojen kehitystä ja analyysiä; ne määrittävät, miten välitinlinkki uudelleenkäyttää taajuuskaistoja jokaisessa hypyssään. Erityisesti "full-duplex"-tila nostetaan esiin toteuttamiskelpoisena ja edistyneenä vaihtoehtona perinteiselle "half-duplex"-tilalle vaikka sen luontainen itse-interferenssi otetaankin huomioon. Uusia tekniikoita kehitetään ja arvioidaan itse-interferenssin poistoa varten ja lähetystehon säätö esitetään vastakeinona jäännöshäiriölle. Lopulta määritetään pohjimmaiset kriteerit, joiden perusteella dupleksitilat voi asettaa paremmuusjärjestykseen, joka toimii näiden vertailuna mutta myös mahdollistaa opportunistisen tilanvalinnan lähetyksen aikana. Toinen pääaihe käsittelee välitysprotokollien kehitystä ja analyysiä; ne määrittelevät signaalinkäsittelyn, joka tehdään välittimissä vastaanoton ja uudelleenlähetyksen välissä. Tämä tutkielma tunnistaa kattavan joukon vaihtoehtoja OFDM(A)-välitysprotokollien suunnittelulle ja arvioi niiden yhdistelmien toimintaa. Samankaltainen analyysi suoritetaan myös dupleksitiloille ja monen käyttäjän vuoronjaolle. Lisäksi kehitetään uusi analyyttinen kehys, jolla tutkitaan kanavien viivehajontaa pelkkään vahvistukseen perustuvissa monihyppyisissä OFDM-linkeissä kun otetaan huomioon kantoaaltojen ja symbolien väliset häiriöt sekä aikasynkronisointivirheet. Läpi koko tutkielman dupleksitilojen ja välitysprotokollien kehitys tehdään yhdessä tilastollisen tehokkuusanalyysin kanssa, joka mahdollistaa täsmälliset vertailut aikaisempien ja ehdotettujen konseptien välillä. Erityisesti kaikki tulokset muodostetaan suljetun muodon kaavojen avulla. Esitetty analyysi kattaa kaikki olennaiset systeemivariaatiot mukaan lukien tyypilliset protokollat sekä ala- ja ylälinkin tiedonsiirron havainnollistaen näiden eroja.

Julkaisun otsikon käännös	Monihyppyisten OFDM(A)-linkkien dupleksitilojen ja välitysprotokollien kehitys ja analyysi
Alkuperäiskieli	Englanti
Pätevyys	Tohtorintutkinto
Myöntävä instituutio	Aalto-yliopisto
Valvoja/neuvonantaja	Wichman, Risto, Vastuuprofessori Werner, Stefan, Ohjaaja
Kustantaja	Aalto University
Painoksen ISBN	978-952-60-5714-9
Sähköinen ISBN	978-952-60-5715-6
Tila	Julkaistu - 2014
OKM-julkaisutyyppi	G4 Monografiaväitöskirja

Tutkimusalat

langaton tiedonsiirto
välittimet

Pääsy asiakirjaan

http://urn.fi/URN:ISBN:978-952-60-5715-6Lisenssi: Määrittelemätön

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@phdthesis{400ac44167964efabb939955a7ffb0b3,

title = "Design and Analysis of Duplexing Modes and Forwarding Protocols for OFDM(A) Relay Links",

abstract = "Relaying, i.e., multihop communication via so-called relay nodes, has emerged as an advanced technology for economically realizing long transmission ranges and high data rates in wireless systems. The focus of this thesis is on multihop multiuser systems where signals are modulated with orthogonal frequency-division multiplexing or multiple access, i.e., OFDM(A), and relays are infrastructure-based network nodes. In general, the thesis contributes by investigating how to operate relay links optimally under spectrum, transmit power and processing capability limitations, as well as how to improve signal processing in relays by exploiting other advanced concepts such as multiantenna techniques, spectrum reuse, transmit power adaptation, and new options for multicarrier protocol design. The first theme is the design and analysis of duplexing modes which define how a relay link reuses allocated frequency bands in each hop. Especially, the full-duplex relaying mode is promoted as a feasible, advantageous alternative to conventional half-duplex operation while its inherent loopback self-interference is recognized and dealt with: New techniques are developed and evaluated for the mitigation of self-interference while transmit power control is proposed as a countermeasure against residual distortion. Finally, the fundamental criteria to prefer one mode over the other are determined which not only serves as a comparison between the modes but allows for opportunistic mode switching during operation. The second theme is the design and analysis of forwarding protocols which specify signal processing done between reception and retransmission in a relay. The study identifies a comprehensive set of design options for OFDM(A) relaying protocols and evaluates their combinations. Similar analysis is conducted for evaluating the duplexing modes and multiuser scheduling. Furthermore, a new analytical framework is developed for studying the channel delay spread characteristics of non-regenerative multihop OFDM links in conjunction with inter-carrier and inter-symbol interference as well as time synchronization error. Throughout the thesis, the design of relaying modes and protocols is conducted together with statistical performance analysis which facilitates discerning comparisons between existing and proposed concepts. Especially, all the contributions are established by means of closed-form expressions derived for the considered systems. The results cover all essential system variations, including amplify-and-forward and decode-and-forward protocols as well as downlink and uplink relaying reflecting their differences in infrastructure-based relaying.",

keywords = "OFDM, OFDMA, wireless communication, relays, langaton tiedonsiirto, v{\"a}littimet, OFDM, OFDMA, wireless communication, relays",

author = "Taneli Riihonen",

year = "2014",

language = "English",

isbn = "978-952-60-5714-9",

series = "Aalto University publication series DOCTORAL DISSERTATIONS",

publisher = "Aalto University",

number = "81",

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school = "Aalto University",

}

TY - BOOK

T1 - Design and Analysis of Duplexing Modes and Forwarding Protocols for OFDM(A) Relay Links

AU - Riihonen, Taneli

PY - 2014

Y1 - 2014

N2 - Relaying, i.e., multihop communication via so-called relay nodes, has emerged as an advanced technology for economically realizing long transmission ranges and high data rates in wireless systems. The focus of this thesis is on multihop multiuser systems where signals are modulated with orthogonal frequency-division multiplexing or multiple access, i.e., OFDM(A), and relays are infrastructure-based network nodes. In general, the thesis contributes by investigating how to operate relay links optimally under spectrum, transmit power and processing capability limitations, as well as how to improve signal processing in relays by exploiting other advanced concepts such as multiantenna techniques, spectrum reuse, transmit power adaptation, and new options for multicarrier protocol design. The first theme is the design and analysis of duplexing modes which define how a relay link reuses allocated frequency bands in each hop. Especially, the full-duplex relaying mode is promoted as a feasible, advantageous alternative to conventional half-duplex operation while its inherent loopback self-interference is recognized and dealt with: New techniques are developed and evaluated for the mitigation of self-interference while transmit power control is proposed as a countermeasure against residual distortion. Finally, the fundamental criteria to prefer one mode over the other are determined which not only serves as a comparison between the modes but allows for opportunistic mode switching during operation. The second theme is the design and analysis of forwarding protocols which specify signal processing done between reception and retransmission in a relay. The study identifies a comprehensive set of design options for OFDM(A) relaying protocols and evaluates their combinations. Similar analysis is conducted for evaluating the duplexing modes and multiuser scheduling. Furthermore, a new analytical framework is developed for studying the channel delay spread characteristics of non-regenerative multihop OFDM links in conjunction with inter-carrier and inter-symbol interference as well as time synchronization error. Throughout the thesis, the design of relaying modes and protocols is conducted together with statistical performance analysis which facilitates discerning comparisons between existing and proposed concepts. Especially, all the contributions are established by means of closed-form expressions derived for the considered systems. The results cover all essential system variations, including amplify-and-forward and decode-and-forward protocols as well as downlink and uplink relaying reflecting their differences in infrastructure-based relaying.

AB - Relaying, i.e., multihop communication via so-called relay nodes, has emerged as an advanced technology for economically realizing long transmission ranges and high data rates in wireless systems. The focus of this thesis is on multihop multiuser systems where signals are modulated with orthogonal frequency-division multiplexing or multiple access, i.e., OFDM(A), and relays are infrastructure-based network nodes. In general, the thesis contributes by investigating how to operate relay links optimally under spectrum, transmit power and processing capability limitations, as well as how to improve signal processing in relays by exploiting other advanced concepts such as multiantenna techniques, spectrum reuse, transmit power adaptation, and new options for multicarrier protocol design. The first theme is the design and analysis of duplexing modes which define how a relay link reuses allocated frequency bands in each hop. Especially, the full-duplex relaying mode is promoted as a feasible, advantageous alternative to conventional half-duplex operation while its inherent loopback self-interference is recognized and dealt with: New techniques are developed and evaluated for the mitigation of self-interference while transmit power control is proposed as a countermeasure against residual distortion. Finally, the fundamental criteria to prefer one mode over the other are determined which not only serves as a comparison between the modes but allows for opportunistic mode switching during operation. The second theme is the design and analysis of forwarding protocols which specify signal processing done between reception and retransmission in a relay. The study identifies a comprehensive set of design options for OFDM(A) relaying protocols and evaluates their combinations. Similar analysis is conducted for evaluating the duplexing modes and multiuser scheduling. Furthermore, a new analytical framework is developed for studying the channel delay spread characteristics of non-regenerative multihop OFDM links in conjunction with inter-carrier and inter-symbol interference as well as time synchronization error. Throughout the thesis, the design of relaying modes and protocols is conducted together with statistical performance analysis which facilitates discerning comparisons between existing and proposed concepts. Especially, all the contributions are established by means of closed-form expressions derived for the considered systems. The results cover all essential system variations, including amplify-and-forward and decode-and-forward protocols as well as downlink and uplink relaying reflecting their differences in infrastructure-based relaying.

KW - OFDM

KW - OFDMA

KW - wireless communication

KW - relays

KW - langaton tiedonsiirto

KW - välittimet

KW - OFDM

KW - OFDMA

KW - wireless communication

KW - relays

M3 - Doctoral Thesis

SN - 978-952-60-5714-9

T3 - Aalto University publication series DOCTORAL DISSERTATIONS

PB - Aalto University

ER -

Design and Analysis of Duplexing Modes and Forwarding Protocols for OFDM(A) Relay Links

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