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FSK signal generates from USRP issues

FSK signal generates from USRP continuous live streaming example. When generating a frequency-shift keying (FSK) signal using a USRP (Universal Software Radio Peripheral) for continuous live streaming, I observe fluctuations (ON/ OFF) in the signal at high symbol rates.

FSK generate parameter:

Symbol rate = 10MS/s

samples per symbol = 16

FSK deviation = 5Mhz

MFSK = 2

PN sequence order = 9

Gaussian parameter:

Filter length = 8

BT = 0.5

Why signal fluctuations at a high symbol rate and how to resolve it?

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