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Author:Nieminen, Ville
Title:Evaluation and experimentation of Sub-GHz Short-Range Radio Transceivers
Publication type:Master's thesis
Publication year:2009
Pages:ix + 90      Language:   eng
Department/School:Elektroniikan, tietoliikenteen ja automaation tiedekunta
Main subject:Tehoelektroniikka   (S-81)
Supervisor:Ovaska, Seppo
Instructor:Ala-Paavola, Jaakko
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark S80     | Archive
Keywords:sub-GHz
CC1101
wireless sensor networks
ISM
langattomat anturiverkot
Abstract (eng): The purpose of this thesis is to evaluate and to experiment with the short range radio devices (SRD) operating in the 300 MHz - 950 MHz frequency band.
This is called the sub-GHz ISM band.
The physical properties of this frequency band offer better penetration capability, less propagation loss and allow higher output power than the more commonly used 2.4 GHz band.

The divergent regulatory demands in different countries, concerning the sub-GHz ISM band, present challenges for implementing global solutions.
The problems are discussed and an evaluation of the current market situation of the available sub-GHz radio transceivers is given For a transceiver to be able to comply with the divergent regulatory demands, support for extensive frequency coverage and adjustable output power is required A suitable transceiver to implement a prototype is chosen.
This is the Texas Instruments CC 1101.
In addition, four different antenna solutions for the use in the ISM band are presented.

Prototypes with the selected radio transceiver, the Texas Instruments MSP430F5437 microcontroller and the four different antenna solutions are manufactured and tested for performance inside a building and outdoors for line of sight range.
It is concluded that the sub-GHz band offers more range and more reliable transmission than the more common 2.4 GHz band, but with more complex regulatory demands and with less standardized conventions.
Abstract (fin): Tämän diplomityön tarkoitus on tutkia ja kokeilla lyhyen kantaman radiolähettimiä, jotka toimivat 300 MHz - 950 MHz taajuusalueella.
Tätä kutsutaan alle 1 GHz ISM taajuusalueeksi (sub-GHz).
Tämän taajuuden fysikaaliset ominaisuudet tarjoavat paremman tunkeutumiskyvyn, vähemmän etenemishäviöitä ja korkeamman suurimman sallitun lähetystehon kuin yleisempi 2.4 Ghz taajuusalue.

Poikkeavat määräykset luvasta vapautettujen radiolähettimien käytöstä eri maissa alle 1 GHz ISM taajuuksilla aiheuttavat haasteita maailmanlaajuisten ratkaisujen kehittämiseksi.
Näitä ongelmia käsitellään ja luodaan tämänhetkinen markkinakatsaus alle 1 Ghz:n ISM taajuusalueen lähetin-vastaanottimille.
Jotta lähetin-vastaanotin saadaan toimimaan määräyksien mukaisesti, vaaditaan laaja taajuustuki ja säädettävä ulostuloteho.
Hyvä valinta alle 1 GHz ISM taajuuksien lähetin-vastaanottimeksi on Texas Instruments CC1101.
Myös neljä erilaista yleisesti alle 1 GHz ISM taajuuksilla käytettävää antenniratkaisua esitellään.

CC1101 lähetin-vastaanottimesta, neljästä esitellystä antennityypistä ja Texas Instruments MSP430F5437 mikrokontrollerista rakennetut prototyypit testataan sisätiloissa ja ulkona.
Johtopäätös on, että alle 1 GHz ISM taajuudet tarjoavat pidemmän kantomatkan ja luotettavamman tiedonsiirron kuin yleisemmin käytetty 2.4 GHz ISM taajuus.
Heikkoutena tällä taajuudella ovat toisistaan poikkeavat määräykset ja vähemmän standardisoidut käytännöt.
ED:2010-01-13
INSSI record number: 38735
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