Calculating an EVM of a transmitter
AssigneeLenovo (Singapore) Pte. Ltd.
InventorColin D. Frank
Life of this patent
Estimating the term…
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 multiple-layer MIMO signal from a transmitter via a propagation channel. The processor measures the received multiple-layer MIMO signal using an unbiased linear MMSE MIMO equalizer and calculates an EVM of the transmitter, where the EVM for each transmission layer is calculated as 100 times the square root of the mean square error of the layer estimate at the output of the unbiased linear MMSE MIMO equalizer.
Claims20
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 multiple-layer Multiple-Input, Multiple-Output (“MIMO”) signal from a transmitter via a propagation channel;
- measure the multiple-layer MIMO signal using an unbiased linear minimum mean square error (“MMSE”) MIMO equalizer;
- and
- calculate an error vector magnitude (“EVM”) of the transmitter based on a noise covariance matrix for the unbiased linear MMSE MIMO equalizer and further based on a plurality of per-layer EVM values corresponding to the multiple-layer MIMO signal, wherein the per-layer EVM value for each transmission layer is calculated as 100 times a square root of a mean square error of a layer estimate at an output of the unbiased linear MMSE MIMO equalizer.
A method for calculating an error vector magnitude (“EVM”) of a transmitter, the method comprising:
- receiving a multiple-layer Multiple-Input, Multiple-Output (“MIMO”) signal from a transmitter via a propagation channel;
- measuring the multiple-layer MIMO signal using an unbiased linear minimum mean square error (“MMSE”) MIMO equalizer;
- and
- calculating an error vector magnitude (“EVM”) of the transmitter based on a noise covariance matrix for the unbiased linear MMSE MIMO equalizer and further based on a plurality of per-layer EVM values corresponding to the multiple-layer MIMO signal, wherein the per-layer EVM value for each transmission layer is calculated as 100 times a square root of a mean square error of a layer estimate at an output of the unbiased linear MMSE MIMO equalizer.
A system comprising:
- a transmitting device that:
- generates a multiple-layer transmission signal for Multiple-Input, Multiple-Output (“MIMO”);
- and
- transmits the generated multiple-layer transmission signal via a propagation channel using a transmitter;
- and
- an evaluation device that:
- measures the transmitted multiple-layer transmission signal using an unbiased linear minimum mean square error (“MMSE”) MIMO equalizer;
- and
- calculates an error vector magnitude (“EVM”) of the transmitter based on a noise covariance matrix for the unbiased linear MMSE MIMO equalizer and further based on a plurality of per-layer EVM values corresponding to the multiple-layer MIMO signal, wherein the per-layer EVM value for each transmission layer is calculated as 100 times a square root of a mean square error of a layer estimate at an output of the unbiased linear MMSE MIMO equalizer.
Dependencies are inferred from the claim text.