diff options
Diffstat (limited to 'dpd')
| -rw-r--r-- | dpd/README.md | 6 | ||||
| -rw-r--r-- | dpd/dpd.ini | 4 |
2 files changed, 6 insertions, 4 deletions
diff --git a/dpd/README.md b/dpd/README.md index 96c4fb0..ec7cec2 100644 --- a/dpd/README.md +++ b/dpd/README.md @@ -8,11 +8,13 @@ This folder contains work in progress for digital predistortion. It requires: - A feedback connection from the power amplifier output, at an appropriate power level for the B200. Usually this is done with a directional coupler. - ODR-DabMod with enabled dpd_port, and with a samplerate of 8192000 samples per second. -- Synchronous=1 so that the USRP has the timestamping set properly. +- Synchronous=1 so that the USRP has the timestamping set properly, internal refclk and pps + are sufficient for this example. +- A live mux source with TIST enabled. See dpd/dpd.ini for an example. TODO ---- -Fix timestamps and test if frame data is valid. +Implement a PA model that updates the predistorter. diff --git a/dpd/dpd.ini b/dpd/dpd.ini index 625df73..910f251 100644 --- a/dpd/dpd.ini +++ b/dpd/dpd.ini @@ -14,7 +14,7 @@ transport=tcp source=localhost:9200 [modulator] -digital_gain=0.9 +digital_gain=0.8 rate=8192000 [firfilter] @@ -34,7 +34,7 @@ pps_source=none behaviour_refclk_lock_lost=ignore max_gps_holdover_time=600 dpd_port=50055 -rxgain=10 +rxgain=0 [delaymanagement] ; Use synchronous=1 so that the USRP time is set. This works |