From 727e8c1e139cec691d07a45abab21836f46c3d33 Mon Sep 17 00:00:00 2001 From: "Matthias P. Braendli" Date: Fri, 29 Dec 2017 09:24:06 +0100 Subject: Update DPD readme --- dpd/README.md | 33 +++++++++++++++++++++++++-------- 1 file changed, 25 insertions(+), 8 deletions(-) (limited to 'dpd') diff --git a/dpd/README.md b/dpd/README.md index 1b481c0..fc84bad 100644 --- a/dpd/README.md +++ b/dpd/README.md @@ -109,14 +109,31 @@ The DPDCE uses automatic gain control for both TX and RX gain to get both a high quantisation quality for the most frequent amplitude regions and a high enough back-off so the peaks are also quantised correctly. This means that the output power will stay at the same level, but the DPDCE may change TX gain to -trade it with digital gain and also change RX gain. - -As a first test you should run the DPDCE with the *--plot* parameter. It -preserves the output power and generates all available visualisation plots in -the newly created logging directory `/tmp/dpd_`. As the predistortion -should increase the peak to shoulder ratio, you should select a *txgain* in the -ODR-DabMod configuration file such that the initial peak-to-soulder ratio -visible on your spectrum analyser. This way, you will be able to see a the +trade it with digital gain and also change RX gain. This also implies that you +should *not modify txgain, rxgain, digital gain or coefficient settings manually!* +When the DPDCE is used, it controls these settings, and there are command line +options for you to define initial values. + +To verify that the communication between the DPDCE and ODR-DabMod is ok, +you can use the status and reset options: + +``` +cd dpd +python main.py --status +python main.py --reset +``` + +The reset option sets all DPD-related settings to the defaults (as shown in the +`--help` usage screen) and stops. + +When neither `--status` nor `--reset` is given, the DPDCE will run the predistortion +algorithm. As a first test you should run the DPDCE with the `--plot` +parameter. It preserves the output power and generates all available +visualisation plots in the newly created logging directory +`/tmp/dpd_`. As the predistortion should increase the peak to +shoulder ratio, you should select a *txgain* in the ODR-DabMod configuration +file such that the initial peak-to-soulder ratio visible on your spectrum +analyser. This way, you will be able to see a the change. ``` -- cgit v1.2.3