[srslte-users] Extracting eNodeB and UE OFDM Data

Andre Puschmann andre.puschmann at softwareradiosystems.com
Thu Jul 20 20:40:39 UTC 2017


Hi Andrew,

On 20.07.2017 21:22, Andrew McClelland wrote:
> Hi all,
> 
> I'm looking to perform EVM analysis on the signal generated by
> ./pdsch_enodeb. Correct me if I'm wrong, but am I correct in my
> understanding that ./pdsch_enodeb generates random user data, modulates it,
> and then writes to a file. And then ./pdsch_ue reads this file, demodulates
> it, and spits out some data about that read signal.
> 
> For EVM, I'd need the eNodeb OFDM data (defaults srsLTE is QPSK?) as
> well as the UE OFDM data. Is there an easy way to extract this data from
> the eNodeB and UE programs to perform EVM on the data?

You can perform your EVM analysis solely on the receiver side. All you
need is to know "how far away" your rx'ed constellation point is from
the ideal one. This of course depends on the modulation type you use but
you get this on the UE from the DCI sent from the eNB.

Hope that helps.

Best
Andre


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