Hi,
I use default DPDconfig to configure DPD on my custom board:
static mykonosDpdConfig_t dpdConfig =
{
10, /* 1/2^(damping + 8) fraction of power `forgotten' per sample (default: `1/8192' = 5, valid 0 to 15), 0 = infinite damping*/
1, /* number of weights to use for int8_cpx weights weights member of this structure (default = 1)*/
2, /* DPD model version: one of four different generalized polynomial models: 0 = same as R0 silicon, 1-3 are new and the best one depends on the PA (default: 2)*/
1, /* 1 = Update saved model whenever peak Tx digital RMS is within 1dB of historical peak Tx RMS*/
20, /* Determines how much weight the loaded prior model has on DPD modeling (Valid 0 - 32, default 20)*/
0, /* Default off = 0, 1=enables automatic outlier removal during DPD modeling */
512, /* Number of samples to capture (default: 512, valid 64-32768)*/
4096, /* threshold for sample in AM-AM plot outside of 1:1 line to be thrown out. (default: 50% = 8192/2, valid 8192 to 1)*/
0, /* 16th of an ORx sample (16=1sample), (default 0, valid -64 to 64)*/
255, /* Default 255 (-30dBFs=(20Log10(value/8192)), (valid range 1 to 8191)*/
{{64,0},{0,0},{0,0}}/* DPD model error weighting (real/imag valid from -128 to 127)*/
};
I implement DPD follow this tutorial:
https://github.com/analogdevicesinc/no-OS/commit/4785f136110556218f9e9ab46c1f8da734a6c032
My system have multi mode BPSK, QPSK, QUAM16,QUAM64 with bandwidth 5MHz, 10MHz, 20Mhz.
I have feedback Tx2 signal into ORX2 and configure dpd follow ug992. But i don't see any different between have setup DPD and no have DPD.
Here is status that I read using MYKONOS_getDpdStatus:
dpdStatus.dpdErrorStatus = 0,
dpdStatus.dpdExtPathDelay = 0x73B ,
dpdStatus.dpdIterCount = 0,
dpdStatus.dpdMaxAdaptation = 0,
dpdStatus.dpdModelErrorPercent = 1000,
dpdStatus.dpdTrackCount = 0
Can you suggest for me how to solve? Thanks. This is my output from tx in 20MHz bandwith:
