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US 12,113,568 B2Granted
LO phase correction for AAS with multiple RFIC
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsRaihan Rafique, Joakim Hallin, Dimitar Nikolov
Life of this patent
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Abstract
Systems and methods are disclosed for correcting Local Oscillator (LO) phase misalignment between different Radio Frequency Integrated Circuits (RFIC) of an Advanced Antenna System (AAS).
Claims21
A radio system comprising:
- a processing unit;
- and
- two or more Radio Frequency Integrated Circuits (RFICs) wherein each RFIC comprises:
- Local Oscillator (LO) generation circuitry configured to generate a LO signal;
- and
- processing circuitry configured to, based on the LO signal, upconvert signals to be transmitted via a plurality of antenna elements for the RFIC and/or downconvert signals received via the plurality of antenna elements for the RFIC;
- and
- wherein the processing unit is adapted to, for a first RFIC pair comprising two of the two or more RFICs, namely a first RFIC and a second RFIC:
- obtain a first power measurement for the first RFIC pair of a first test signal via a receive antenna element for either the first RFIC or the second RFIC, wherein the first test signal is transmitted via a first transmit antenna element for the first RFIC and a second transmit antenna element for the second RFIC and a phase state of the second RFIC is a first LO phase state,
- obtain a second power measurement for the first RFIC pair of a second test signal via the receive antenna element, wherein the second test signal is transmitted via the first transmit antenna element and the second transmit antenna element and the phase state of the second RFIC is a second LO phase state;
- and
- set the phase state of the second RFIC to a determined LO phase state based on the first power measurement and the second power measurement.
9 more elements
A radio system comprising two or more Radio Frequency Integrated Circuits (RFICs) wherein each RFIC comprises:
- Local Oscillator (LO) generation circuitry configured to generate a LO signal;
- and
- processing circuitry configured to, based on the LO signal, upconvert signals to be transmitted via a plurality of antenna elements or the RFIC and/or downconvert signals received via the plurality of antenna elements for the RFIC;
- and
- a processing unit adapted to, for a first RFIC pair comprising two of the two or more RFICs, namely a first RFIC and a second RFIC:
- obtain a first power measurement for the first RFIC pair of a first test signal via a first receive antenna element for the first RFIC and a second receive antenna element for the second RFIC while the first test signal is transmitted via a transmit antenna element for either the first RFIC or the second RFIC and a phase state of the second RFIC is a first LO phase state;
- obtain a second power measurement for the first RFIC pair of a second test signal via the first receive antenna element and the second receive antenna element, wherein the second test signal is transmitted via the transmit antenna element and the phase state of the second RFIC is a second LO phase state;
- and
- set the phase state of the second RFIC to a determined LO phase state based on the first power measurement and the second power measurement.
6 more elements
A method for self-testing of a system comprising a radio system comprising two or more Radio Frequency Integrated Circuits (RFICs) each comprising Local Oscillator (LO) generation circuitry configured to generate a LO signal, and processing circuitry configured to, based on the LO signal, upconvert signals to be transmitted via a plurality of antenna elements for the RFIC and/or downconvert signals received via the plurality of antenna elements for the RFIC, wherein the method comprises, for a first RFIC pair comprising two of the two or more RFICs, namely a first RFIC and a second RFIC:
- obtaining a first power measurement for the first RFIC pair of a first test signal via a receive antenna element for the first RFIC pair while the first test signal is transmitted via a first transmit antenna element for the first RFIC pair and a second transmit antenna element for the first RFIC pair and a phase state of the second RFIC is a first LO phase state;
- obtaining a second power measurement for the first RFIC pair of a second test signal via the receive antenna element, wherein the second test signal is transmitted via the first transmit antenna element and the second transmit antenna element and the phase state of the second RFIC is a second LO phase state;
- and
- setting the phase state of the second RFIC to a determined LO phase state based on the first power measurement and the second power measurement.
1 more element
A base station comprising:
- a radio system that comprises:
- a processing unit;
- and
- two or more Radio Frequency Integrated Circuits (RFICs) wherein each RFIC comprises:
- Local Oscillator (LO) generation circuitry configured to generate a LO signal;
- and
- processing circuitry configured to, based on the LO signal:
- upconvert signals to be transmitted via a plurality of antenna elements for the RFIC and/or downconvert signals received via the plurality of antenna elements for the RFIC;
- and
- wherein the processing unit is adapted to, for a first RFIC pair comprising two of the two or more RFICs, namely a first RFIC and a second RFIC:
- obtain a first power measurement for the first RFIC pair of a first test signal via a receive antenna element for either the first RFIC or the second RFIC, wherein the first test signal is transmitted via a first transmit antenna element for the first RFIC and a second transmit antenna element for the second RFIC and a phase state of the second RFIC is a first LO phase state,
- obtain a second power measurement for the first RFIC pair of a second test signal via the receive antenna element, wherein the second test signal is transmitted via the first transmit antenna element and the second transmit antenna element and the phase state of the second RFIC is a second LO phase state;
- and
- set the phase state of the second RFIC to a determined LO phase state based on the first power measurement and the second power measurement.
11 more elements
Dependencies are inferred from the claim text.