Hello.
I fact I have issue (problem) with douwsampleFactor. I use PPS for synchronization two IQ stream from BB60C. So I have trigger with accuracy (time) of samples. So if I will use filter on BB60C (for filtering 10kHz) I will have slow sample (douwsampleFactor = 512) and incorrect time (time with low accuracy). Then I need develop filter on my source code.
Can I outflank that issue?

Probably it formula has error.
Correct:
dBm = 10*log10(mW)
Current (incorrect):
dBm = 10*log10(mW^2)
May by I/Q data is scaled to mW^0.5 ?

Andrew. Thank you.

Hello Justin
Thank you for answer.
With “douwsampleFactor” I understood. It is clear from API Manual.
For me interested third parameter from bbConfigureIQ. It is “bandwidth”

bbConfigureIQ(int device, int downsampleFactor, double bandwidth)

I tested receiving IQ stream for GSM. So I think that in BB60C exist digital filter.
Examples:
I can synchronization with GSM signal if I use:
bbConfigureIQ(int device, int downsampleFactor, 200000)
and I cannot do it if I use
bbConfigureIQ(int device, int downsampleFactor, 2000000)
Because I have mixed with others GSM channel.
But if use “bandwidth” = 2000 I can synchronization with GSM signal. So I don’t fill difference between 2000 and 200000.
Probably parameter “bandwidth” has some limit for low value.
Can you give me some description?
Because I cannot find it in API Manual.

[Author]

Posts