US 12,149,388 B2
Calculating an EVM of an antenna port
Colin D. Frank, Park Ridge, IL (US)
Assigned to Lenovo (Singapore) Pte. Ltd., New Tech Park (SG)
Appl. No. 18/250,338
Filed by Lenovo (Singapore) Pte. Ltd., New Tech Park (SG)
PCT Filed Oct. 25, 2021, PCT No. PCT/IB2021/059840
§ 371(c)(1), (2) Date Apr. 24, 2023,
PCT Pub. No. WO2022/084973, PCT Pub. Date Apr. 28, 2022.
Claims priority of provisional application 63/105,037, filed on Oct. 23, 2020.
Prior Publication US 2023/0396470 A1, Dec. 7, 2023
Int. Cl. H04L 25/03 (2006.01)
CPC H04L 25/03968 (2013.01) 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a processor; and
a memory coupled to the processor, the memory comprising instructions that are executable by the processor to cause the apparatus to:
receive, using an unbiased linear minimum mean square error (“MMSE”) equalizer, a transmission signal transmitted via a propagation channel, the transmission signal generated and transmitted using an antenna port at a transmitter, the antenna port comprising a plurality of antennas (N) and an antenna connector for each of the plurality of antennas; and
determine an error vector magnitude (“EVM”) for the antenna port of the transmitter based on an output of the unbiased linear MMSE equalizer, the EVM for the antenna port defined as:

OG Complex Work Unit Math
where Σ′ is a covariance matrix of the transmitter noise with dimension N×N and is given by Σ′=custom charactern′Hn′custom character.