Re: [Discuss-gnuradio] Sounding signal output power and spectrum

[Johnathan Corgan]

On Sat, Nov 29, 2008 at 9:55 AM, Qi Chen <address@hidden> wrote:

> 1. The gr-sounder default transmit amplitude is 4096, is there a particular
> reason why this number is chosen? My guess is because a 12-bit DAC is used.

You are correct.  This app uses a custom FPGA image for transmission,
and unlike most GNU Radio applications, the amplitude here is directly
converted to the DAC output values.  This is the maximum amplitude.

> 3. I did a indoor measurement with TX-RX separation of 50 meters (w/ LOS),
> the received channel impulse response has 5 chunks of CIRs instead of one,
> and the number of samples between each chunk is always 800 chips, I am sure
> those CIRs are not multipath delays since in an indoor environment the
> corresponding delays can't be 800-chips apart from each other(way too long).
> Am I missing something here?

You need to post your command line parameters for the transmitter and receiver.

-Johnathan