EEP-B2 vs EEP-A3

[Peter Whisker]

I am currently running the latest ("next") ODR tools with an EasyDAB v2 and the latest firmware. The results are very good.

I have been doing some reception tests with a 64k DAB+ stream comparing EEP-A3 versus EEP-B2. Although EEP-B2 is theoretically a lower protection level using fewer CUs I find it is performing better empirically giving a better range.

Does anyone know why this might be?

Thanks
Peter

[Rashid Mustapha]

Hi Peter,

Hmm....thank you for reminding me about this. I have heard this before and intended to look into why. I've been busy enough for it to slip my mind entirely.

Planning notes I have seen dismiss profile B quickly because it is less flexible due to the 32k step vs the 8k with A. It is important to determine if there is a different C/N requirement as every dB helps. Especially with low power multiplexes!

I wonder if it is something to do with whole superframes being more recoverable from interleaving with 32k chunks. I suppose it could straddle more symbols which might....I'm guessing so I need to do those tests and produce the missing C/N table for profile B!

Best regards,

Rash.

Peter

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[Peter Whisker]

Hi Rash

Just wondering if you have found out anything. I still think that for 64k AAP, EEP-B2 seems more robust than EEP-A3 and also costs only 42 CUs instead of 48.

Regards
Peter

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[Joachim Lehnert]

Hi Peter,

I know that there had been some laboratory tests in the IRT (instute of radio technology) at Munich in 2012 with different PL for DAB+.
The results of the C/N values are publishes on the EBU report TR 025 (2012).
But only for the PL class "A".
The C/N values of DAB+ for mobile or portable reception (rayleigh channel) are:
EEP 1A (code rate 0.25): 7.0 dB
EEP 2A (code rate 0.375): 9.3 dB
EEP 3A (code rate 0.50): 11.8 dB
EEP 4A (code rate 0.75): 17.3 dB

The code rates of class "B" are
EEP 1B: code rate 4/9 ca. 0.4444
EEP 2B: code rate 4/7 ca. 0.5714
EEP 3A: code rate 4/6 ca. 0.6666
EEP 4A: code rate 4/5       0.8

Comparing EEP-A3 to EEP-B2 you see that the coderate is a bit lower in EEP-A3 (0.0714 dB) and therefore the C/N in EEP-B2 must be a little bit better. If you interpolate the values lineary (that is not very correct, but to get a first pproximate value that's ok) you find a value of about 1.5 dB (for 50% location probability) of improvement of EEP-B2.

I hope it was useful.

Best regards
Joachim

[Rashid Mustapha]

Hi Peter,

Unfortunately I have too much on at the moment to have found any time to look into this. :(

Maybe something I can do at RadioHack, if there is some spare time.

Best regards,

Rash.

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