Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Olli Piirainen"'
Autor:
Koji Yamanaka, Peter M. Asbeck, Shuichi Sakata, Jarno K. Tanskanen, Rui Ma, Tapio Kolmonen, Yuji Komatsuzaki, Sandro Lanfranco, Olli Piirainen, Shintaro Shinjo
Publikováno v:
2018 IEEE/MTT-S International Microwave Symposium - IMS.
We report a high efficiency sub-6GHz wideband Envelope-Tracking Power Amplifier (ET-PA) including a soft-switching buck-converter and a wideband RF-PA, used in conjunction with a digital front end (DFE) environment for signal generation and predistor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f80bdb1a7be4c4c5496df65de9d8f55c
https://doi.org/10.1109/mwsym.2018.8439225
https://doi.org/10.1109/mwsym.2018.8439225
Autor:
Shintaro Shinjo, Tapio Kolmonen, Sandro Lanfranco, Peter M. Asbeck, Takanobu Fujiwara, Olli Piirainen, Shuichi Sakata
Publikováno v:
2017 IEEE MTT-S International Microwave Symposium (IMS).
We report a high efficiency multi-band Envelope-Tracking Power Amplifier (ET-PA) that supports modulation bandwidth up to 80MHz using real-time digital predistortion (RT-DPD). The ET-PA consists of a broadband RF-PA and a singlephase buck-converter.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b87d849b031a7dc1372eb02d4918a6ef
https://doi.org/10.1109/mwsym.2017.8059016
https://doi.org/10.1109/mwsym.2017.8059016
Scheduling of the Activations in Iterative Detection, Decoding, and Channel Estimation for MIMO-OFDM
Publikováno v:
IEEE Transactions on Communications. 61:638-647
An iterative receiver for a multiple-input-multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) system is considered to jointly decode the transmitted bits and estimate the channel state. The receiver consists of the a posteriori
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c9ded5d318bd5e037dcb53ba462946b2
https://doi.org/10.1109/tcomm.2012.010213.090784
https://doi.org/10.1109/tcomm.2012.010213.090784
Publikováno v:
ICC
A three-dimensional (3D) multi-cell multi-user system model along with spatial array processing are presented and studied in this paper. Most of the radio propagation in the literature has been studied and modeled in a two dimensional plane. The 3D p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7478cc729eac70d5e42fdfc1ea7d149d
https://doi.org/10.1109/icc.2011.5963126
https://doi.org/10.1109/icc.2011.5963126
Autor:
Robson Domingos, Olli Piirainen, Carsten Juncker, Renato F. Iida, Jon Helt‐Hansen, Jari Hulkkonen, Kent Pedersen, Rafael C. D. Paiva, Alexandre Loureiro, Mikko Saily, Seelan Sundaralingam, Fernando M. L. Tavares
Publikováno v:
GSM/EDGE: Evolution and Performance
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b20229ed49c19adaa6a82caf4c93b74
https://doi.org/10.1002/9780470669624.ch8
https://doi.org/10.1002/9780470669624.ch8
Publikováno v:
2010 IEEE 21st International Symposium on Personal, Indoor and Mobile Radio Communications Workshops.
We concentrate on the sum power minimization problem for the uplink of wireless cellular systems in this paper. Given a certain quality-of-service (QoS) constraint per mobile station (MS), the optimal power control and receiver beamforming are jointl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eaa3728369b7c1653800a4d9cbe9d507
https://doi.org/10.1109/pimrcw.2010.5670528
https://doi.org/10.1109/pimrcw.2010.5670528
Publikováno v:
2010 European Wireless Conference (EW).
This paper examines the impact of the uplink power control and base station (BS) antenna down tilt on the system level performance in a realistic multicell three dimensional channel model. The 3rd Generation Partnership Project (3GPP) Long Term Evolu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e29f46dac1b8961f7e2f1b47c6975aae
https://doi.org/10.1109/ew.2010.5483447
https://doi.org/10.1109/ew.2010.5483447
Publikováno v:
VTC Spring
This paper presents a higher performance uplink concept for the evolution of GSM/EDGE radio access network (GERAN). The EGPRS2 UL concept can operate at 1.2 times the current GERAN symbol rate, and employ 4-, 16- and 32-QAM constellations, concatenat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be9dec91f7801421bb07d0a4affd207e
https://doi.org/10.1109/vetecs.2008.565
https://doi.org/10.1109/vetecs.2008.565
Publikováno v:
VTC Spring
The further evolution of GSM/EDGE Radio Access Network (GERAN) is currently a subject to standardization in the Third Generation Partnership Project (3GPP). The objectives include significant improvements on user data rates, spectral efficiency and c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cad082e937585f704a1f27a76ebd3daf
https://doi.org/10.1109/vetecs.2006.1683156
https://doi.org/10.1109/vetecs.2006.1683156
Publikováno v:
PIMRC
In this paper the Dual Symbol Rate (DSR) concept is proposed for GERAN networks. DSR doubles the modulation rate and user bit rate per radio time slot. Basic assumption is that the transmit signal of adjacent channels overlap in frequency domain. Int
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::946a62d292968bfd6fd3cc580bfa065d
https://doi.org/10.1109/pimrc.2006.254247
https://doi.org/10.1109/pimrc.2006.254247