Re: [Discuss-gnuradio] How to hold a values from file source

[songsong gee]

For more details, I have two files for test. One is 'all1' and another is 'all0'

+---------------------------------------------+ 'all1' 
|11111111111111111111111111|
+---------------------------------------------+ result (image)

+---------------------------------------------+ 'all0'
 |00000000000000000000000000|
+---------------------------------------------+ result (image)

(For convenience, I copied links to a diagram ASK.grc (image))


It seems that reading 0's appear more frequently in test with 'all0'
So... I think it works somehow but... not perfect because non-zero values never appear in sending a 0 bit.
I think there might be a somewhat 'blank out' of values from file source

Is it inevitable when using file source block?
Or Is it a somewhat sync problem?

I'm new to GRC so it's a kind of hard things :(

2010/10/27 Josh Blum <address@hidden>

On 10/26/2010 10:17 PM, songsong gee wrote:

Currently I am trying to make an ASK (Amplitude Shift Keying)

I use GNURadio Companion,

The program gets the input from file source and multiplies it with signal
source.

And I monitors via Scope and FFT plots

You can see a diagram ASK.grc (image)<http://goo.gl/0WHt>

And the result is somewhat weird. Plots (image)<http://goo.gl/UcF9>

It seems sinusoidal, but the shape looks like sawtooth!

You are multiplying random 1s and 0s by a sinusoid. And you have a sinusoid that is randomly either 0 or sine(x). It looks correct!

Perhaps you want to increase the temporal width of your symbols? In that case, I suggest using the repeat block.

_josh

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio