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This paper provides description of frequency-effective command and measurement system. The rise of frequency resource usage efficiency is achieved by means of application of simple digital modulation for simultaneous range measurement and command and telemetry data transmission.
Orthogonal Frequency Division Multiplexing (OFDM) is a popular and widely accepted modulation technique in the area of wireless communication. Multi-user version of the OFDM system is called Orthogonal Frequency Division Multiple Access (OFDMA). Although OFDM and OFDMA have many benefits contributing to its popularity, a well-known drawback of multicarrier transmission is its inherited large peak-to-average...
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...
Digital modulation signal is the main bearer of modern information transmission; modulation error parameters include Error Vector Magnitude (EVM), MagErr and PhaseErr. However, there are problems for metrology of digital modulation error: first, the signal source and vector signal analyzers calibrates each other, and forms a closed-loop, the calibration is not traceable. Second, digital modulation...
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