Energy-Efficient Array Transmitters Through Outphasing and Over-the-Air Combining

Vesa Lampu, Guixian Xu, Lauri Anttila, Alberto Brihuega Garcia, Marko Kosunen, Vishnu Unnikrishnan, Jussi Ryynänen, Mikko Valkama

Tutkimustuotos: KonferenssiartikkeliScientificvertaisarvioitu

7 Lataukset (Pure)


In this paper, a combinerless outphasing architecture for multiantenna transmitters with analog beamforming is presented and analyzed. The outphasing transmitter facilitates the use of highly power efficient switch-mode power amplifiers (PAs), while the combinerless structure further simplifies and improves the power efficiency of the design. The combining of the component outphasing signals in such a system then occurs over-the-air, at the receiver antenna. We consider two cases, one where the transmit outphased signals are alternately fed to the individual antennas and another where they are grouped in subarrays, and derive the analytical expressions for the total power beampatterns in both cases. Additionally, we carry out extensive simulations to verify the beampattern results and to evaluate the inband and out-of-band emission characteristics of the system, in terms of error vector magnitude (EVM) and total radiated power (TRP)-based adjacent channel leakage ratio (ACLR). We also consider these metrics under gain and phase mismatches in the transmitting antenna branches. The simulation results indicate that the system is able to attain good EVM results, while also the TRP-based ACLR limits imposed by 3GPP can be met if substantially large number of antennas are employed.
Otsikko2021 55th Asilomar Conference on Signals, Systems, and Computers
ISBN (elektroninen)978-1-6654-5828-3
ISBN (painettu)978-1-6654-5829-0
DOI - pysyväislinkit
TilaJulkaistu - 2022
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaAsilomar Conference on Signals, Systems, and Computers - Pacific Grove, Yhdysvallat
Kesto: 31 lokak. 20213 marrask. 2021


NimiAsilomar Conference on Signals, Systems, and Computers proceedings
ISSN (painettu)1058-6393
ISSN (elektroninen)2576-2303


ConferenceAsilomar Conference on Signals, Systems, and Computers
KaupunkiPacific Grove


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