Measurement method for characterizing nonlinearity under near-field and far-field interferers in 5G mmW phased arrays
Tervo, Nuutti; Leinonen, Marko E.; Jokinen, Markku; Aikio, Janne; Kursu, Olli; Sonkki, Marko; Rahkonen, Timo; Pärssinen, Aarno (2019-11-25)
N. Tervo et al., "Measurement Method for Characterizing Nonlinearity Under Near-Field and Far-Field Interferers in 5G mmW Phased Arrays," 2019 49th European Microwave Conference (EuMC), Paris, France, 2019, pp. 420-423. doi: 10.23919/EuMC.2019.8910825
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https://urn.fi/URN:NBN:fi-fe2019121948903
Tiivistelmä
Abstract
A single antenna output of a phased array receiver has only the directivity of the single element. The array gain is achieved once the parallel branches are summed together. The far-field distance of a large array can be several meters which means that for an indoor scenario the interferer can be located in the radiating near-field. In this paper, we present a measurement method for characterizing the nonlinearity of common and parallel paths of the phased array receiver by controlling the number of active RF branches and common branch attenuation. As a measurement platform, we used a 16-chain, 64-element phased array receiver operating at 28 GHz center frequency. ACPR is used as a figure of merit of linearity of the receiver and it is measured over-the-air over the azimuth sector by using 100 MHz wide 5GNR CP-OFDM waveform.
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