Olli Väänänen

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A global system for mobile communication (GSM)/enhanced data rates for GSM evolution (EDGE)/wideband code division multiple access (WCDMA) modulator with a 14-bit on-chip digital-to-analog (D/A) converter is presented. The modulator consists of several digital signal processing building blocks, including a programmable pulse shaping filter, interpolation(More)
In conventional base station solutions, the carriers transmitted are combined after the power amplifiers. An alternative to this is to combine the carriers in the digital domain. The major drawback of the digital carrier combining is a strongly varying envelope of the composite signal. The high PAR sets strict requirements for the linearity of the power(More)
OF DOCTORAL DISSERTATION HELSINKI UNIVERSITY OF TECHNOLOGY P.O. BOX 1000, FI-02015 TKK http://www.tkk.fi Author Name of the dissertation Manuscript submitted Manuscript revised Date of the defence Monograph Article dissertation (summary + original articles) Department Laboratory Field of research Opponent(s) Supervisor Instructor Abstract
A digital OFDM modulator with 2048-point IFFT and 83.2 MHz bandwidth is implemented. The modulator consists of IFFT block, upsampling filters and upconversion included in the upsampling operation. Also a clipping unit is implemented before the on-chip D/A-converter in order to efficiently utilise the whole dynamic range of the converter and to maximise the(More)
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