Seppo Rosnell
Nokia
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Publication
Featured researches published by Seppo Rosnell.
international microwave symposium | 2005
Seppo Rosnell; Jukka Varis
New transmitter architectures utilizing nonlinear power amplifiers when transmitting linearly modulated signals are studied. The emphasis is on bandpass pulse-width modulation (BP-PWM) for which both theory and implementation proposals are presented.
international microwave symposium | 2006
Seppo Rosnell; Jukka Varis; Jaako Maunuksela
A review of bandpass pulse-width modulation (BP-PWM) is presented. Thereafter, a digital implementation of bandpass pulse-width modulator is discussed using W-CDMA transmitter as an example. It is shown that a BP-PWM transmitter that fulfills W-CDMA adjacent channel leakage ratio (ACLR) requirement in a mobile station can be implemented without using any explicit digital-to-analog converters. A drawback is that very high speed digital logic is required. Moreover, in order to reduce wide bandwidth noise, good filtering after the modulator is required. The implementation of the possible logic circuits is also discussed. The results are verified using reduced speed macro measurements
Archive | 2003
Seppo Rosnell; Jukka Varis
Archive | 2001
Jukka Ranta; Harri Jokinen; Seppo Rosnell; Otto-Aleksanteri Lehtiene
Archive | 2004
Seppo Rosnell
Archive | 2001
Seppo Rosnell; Jukka Varis
Archive | 2003
Jukka Varis; Seppo Rosnell
Archive | 1999
Jukka Ranta; Jouko Häkkänen; Seppo Rosnell; Tapani Ekman
Archive | 1999
Tapani Ekman; Seppo Rosnell; Risto Vaisanen
Archive | 2006
Seppo Rosnell; Mika Salmi; Simo Murtojarvi
