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Baseband data generation for pi/4 DQPSK modulated TX

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analog_chip

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Hi,
I am testing my TX which is a MUX based TX for pi/4 DQPSK modulation. I am using an AWG to generate the random binary sequence for the state machine controlling the MUX.
First I tried the sequence so that all phases (0,45,90,...315) get transmitted. But due to periodicity the output spectrum has narrow lobes.

Then I tried a 2000 bit random sequence but still I have those lobes.

1. What is the standard method of generating sequences for testing TX. If random what should be the length of the sequence?

2. Is there a way to look into the PSD of a random binary sequence? IN MATLAB?
 

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