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Your search keyword '"Stadius, Kari"' showing total 20 results
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20 results on '"Stadius, Kari"'

5. Reconfigurable Signal Processing and DSP Hardware Generator for 5G and Beyond Transmitters

Author

Ghosh, Agnimesh, Spelman, Andrei, Cheung, Tze Hin, Boopathy, Dhanashree, Stadius, Kari, Gomony, Manil Dev, Valkama, Mikko, Ryynanen, Jussi, Kosunen, Marko, and Unnikrishnan, Vishnu

Abstract

The digital front-end of the communication transceivers envisioned for fifth-generation (5G) and beyond requires highly configurable high-performance digital signal processing (DSP) hardware operating at very high sampling rates to accommodate increasing signal bandwidths and support a range of modulation schemes and transmitter architectures. In this article, we present an efficient implementation of a highly configurable DSP hardware generator that can generate high-performance DSP hardware for multiple transmitter architectures including Cartesian, polar, outphasing, and multilevel outphasing modulators. The generated hardware unit, which consists of multistage multirate filters and other required DSP operations, runs at sample rates up to 4 GHz. The hardware supports an adjacent channel leakage ratio (ACLR) down to −48 dB and an error vector magnitude (EVM) of 0.78% with a 7-bit phase signal at a sampling rate of 4 GHz for multilevel outphasing modulation. Digital synthesis of the circuit in a 5-nm complimentary metal-oxide semiconductor (CMOS) process yields a core area consumption of 0.01 mm2 and an estimated power consumption of 37.2 mW for a 200-MHz bandwidth 5G new radio (NR) baseband (BB) signal.

Published
2024
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16. Leveraging frequency agility of an MIMO antenna cluster with a transmitter IC.

Author

Saleem, Ali Raza, Luomaniemi, Rasmus, Lehtovuori, Anu, Stadius, Kari, Kosunen, Marko, Viikari, Ville, and Ryynänen, Jussi

Subjects
FREQUENCY agility, ANTENNAS (Electronics), TRANSMITTERS (Communication), MOBILE antennas, INTEGRATED circuits
Abstract

This paper presents the prototype demonstration where an integrated transmitter circuit drives a mobile handset terminal antenna in order to provide frequency tunability and multiple input multiple output (MIMO) operation across the 0.5–4.5 GHz frequency range. The transmitter implementation incorporates on-chip weighted signal generation, i.e. amplitude and phase scaling to provide sufficient MIMO performance in the low band (700–960 MHz) and in the high band (1.5–4.5 GHz). In the transmitter, two antenna elements are used for MIMO operation in the low band and another two in the high band. The transmitter integrated circuit (IC) is fabricated in a 28 nm bulk CMOS technology with an active on-chip area of 0.2 mm $^2$. A custom antenna measurement procedure is proposed here in order to support and verify active antenna measurements with transmitter IC. A measurement procedure for the transmitter system comprising the transmitter IC and four antenna clusters is developed and discussed in comparison with traditional passive antenna measurements. The measurement results demonstrate that the transmitter IC driving the antenna clusters provides total antenna efficiency of $-6.5$ dB to $-1.5$ dB, and envelope correlation coefficient below 0.4 across the designated frequency bands. The results indicate that the implemented transmitter IC successfully tunes frequency response of the antenna clusters, and enhances the MIMO operation of such mobile antennas. [ABSTRACT FROM AUTHOR]

Published
2023
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