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Design >> RF Design >> Generating baseband data for TX using AWG
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Message started by mixed_signal on Nov 7^th, 2013, 7:37pm

Title: Generating baseband data for TX using AWG
Post by mixed_signal on Nov 7^th, 2013, 7:37pm

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. The corrs dig seq is 00011011 .
But due to periodicity of this sequence 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?

Title: Re: Generating baseband data for TX using AWG
Post by ywguo on Nov 22^nd, 2013, 8:25pm

What is the period of your 2000 bit random sequence?