Calculating an EVM of an antenna port
AssigneeLenovo (Singapore) Pte. Ltd.
InventorColin D. Frank
Life of this patent
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Abstract
Apparatuses, methods, and systems are disclosed for calculating an EVM of a transmitter. One apparatus includes a processor and a receiver that receives a signal via a propagation channel from an antenna port at a transmitter, the antenna port comprising multiple antennas and with an antenna connector for each antenna. The processor measures the received signal using an unbiased linear MMSE equalizer and calculates an EVM of the antenna port, where the EVM is calculated as 100 times the square root of the mean square error of the symbol estimate at the output of the unbiased linear MMSE equalizer.
Claims17
An evaluation apparatus comprising:
- at least one memory;
- and
- at least one processor coupled with the at least one memory and configured to cause the evaluation apparatus to:
- receive a signal via a propagation channel from an antenna port at a transmitter, the antenna port comprising a plurality of antennas, wherein each antenna of the plurality of antennas has a respective antenna connector from a plurality of antenna connectors;
- measure the received signal using an unbiased linear minimum mean square error (“MMSE”) equalizer;
- and
- calculate an error vector magnitude (“EVM”) of the antenna port based at least in part on the received signal and an output of the unbiased linear MMSE equalizer, wherein the EVM is calculated as
- EVM=100·√{square root over ((wHΣ−1w)−1)},
- where w denotes a vector of gains measured at a plurality of antenna connectors and Σ denotes a noise covariance vector as measured at the plurality of antenna connectors.
A method performed by an evaluation device, the method comprising:
- receiving a signal via a propagation channel from an antenna port at a transmitter, the antenna port comprising a plurality of antennas, wherein each antenna of the plurality of antennas has a respective antenna connector from a plurality of antenna connectors;
- measuring the received signal using an unbiased linear minimum mean square error (“MMSE”) equalizer;
- and
- calculating an error vector magnitude (“EVM”) of the antenna port based at least in part on the received signal and an output of the unbiased linear MMSE equalizer, wherein the EVM is calculated as
- EVM=100·√{square root over ((wHΣ−1w)−1)},
- where w denotes a vector of gains measured at a plurality of antenna connectors and Σ denotes a noise covariance vector as measured at the plurality of antenna connectors.
A system comprising:
- a transmitting device that:
- generates a single-layer Multiple-Input, Multiple-Output (“MIMO”) signal;
- and
- transmits the single-layer MIMO signal via a propagation channel using a transmitter;
- an evaluation device that:
- receives the single-layer MIMO signal using an unbiased linear minimum mean square error (“MMSE”) equalizer;
- and
- calculates an error vector magnitude (“EVM”) of the transmitter based at least in part on the single-layer MIMO signal and an output of the unbiased linear MMSE equalizer, wherein the EVM is calculated as
- EVM=100·√{square root over ((wHΣ−1w)−1)},
- where w denotes a vector of gains measured at a plurality of antenna connectors and Σ denotes a noise covariance vector as measured at the plurality of antenna connectors.
Dependencies are inferred from the claim text.