SOURCEFORGE » RALF » 2014 ACM testing using channel emulation

h1. Measurement Capabilities

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The Newtec EL470 has no testing capabilities since it was not intended for protocol testing. However, it can output a ACM log containing the modulation and coding scheme for a given transition. This is information is stored in a .csv file similar to the following:

<pre>

Timestamp,Demod,RqModCod,EsNo,CarrierBitrate

2014-11-20 16:15:17,1,16APSK-9/10,28.06,6304

2014-11-20 16:15:21,1,16APSK-9/10,28.05,8877

2014-11-20 16:15:25,1,16APSK-9/10,27.01,8877

2014-11-20 16:15:29,1,16APSK-9/10,27.06,5836

2014-11-20 16:15:33,1,16APSK-9/10,27.24,5836

2014-11-20 16:15:34,1,16APSK-9/10,27.09,5836

2014-11-20 16:15:35,1,16APSK-8/9,27.21,5836

2014-11-20 16:15:35,1,16APSK-9/10,27.05,5836

2014-11-20 16:15:36,1,16APSK-9/10,27.25,5836

2014-11-20 16:15:37,1,16APSK-5/6,27.19,5836

2014-11-20 16:15:38,1,16APSK-8/9,27.11,4250

2014-11-20 16:15:39,1,16APSK-5/6,27.22,4250

</pre>

From this log we can extract the following information:

* Timestamp (in seconds)

* Modcod parameter (modulation + coding rate)

* Estimate of E ~s~ / N ~0~

* Information bitrate (in bps)

This is done by a parser ([[EL470_LogParser_ACM|EL470_LogParser_ACM.m]]) in Matlab which also does some nice plots.