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Digital modulation error parameters, such as error vector magnitude EVM, is important in test and measurement of information system. This paper introduces the technology research progress in the metrology of digital modulation error parameters. First, we point out the basic problems existing in the field, which is about traceability and parameter range of calibration, and describe the relevant research,...
The paper addresses the problems about calibration of vector modulation error, especially of Error Vector Magnitude (EVM): first, signal generator calibrates VSA and vice versa, it forms a closed-loop, so it lacks traceability. Second, signal setting of vector modulation error has always been neglected in the VSA calibration. To solve the problems, we propose new solutions to calibrate EVM, namely,...
The paper addresses the problems about calibration of vector modulation error: first, signal generator calibrates VSA and vice versa, it forms a closed-loop, so it lacks traceability. Second, signal setting of vector modulation error has always been neglected in the VSA calibration This has exposed the shortcomings of the system level verification of VSA. To solve the problems for the GMSK, we propose...
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