Shaped OQPSK Parameters (Digital Demod)
The Shaped OQPSK Offset Quadrature Phase Shift Keying: A type of QPSK modulation that offsets the bit streams on the I and Q channels by a half bit. This reduces amplitude fluctuations and helps improve spectral efficiency. parameters are only enabled when the SOQPSK-TG (IRIG 106-04) reference filter is active.
Signal bandwidth is controlled by these parameters in combination with the Symbol Rate parameter. Any signal power beyond the configured measurement span will lead to higher EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. and potential signal unlock.
– Rolloff factor.
Default: 0.7
Range: 0.1 - 1.0
– Time-scaling factor.
Default: 1.25
Range: 0.1 - 5.0
– Time domain windowing function factor.
Default: 1.5
Range: 0.1 - 5.0
– Time domain windowing function factor.
Default: 0.5
Range: 0.0 - 5.0
See Also
