HI,

Could anyone help me with noise level Estimation using the GNU Radio

block

gr.null_source (float [gr_complex])

I just want to send a constant zero signal an drecord the output.

How to write this simple flow graph?

# Noise level estimation

**Ran_Tian**#1

**Ran_Tian**#2

On Sun, Feb 08, 2009 at 07:36:28PM -0500, Ran Tian wrote:

HI,

Could anyone help me with noise level Estimation using the GNU Radio block

gr.null_source (float [gr_complex])

I just want to send a constant zero signal an drecord the output.

How to write this simple flow graph?

Probably best not to write it at all. Just assign a variable the value

0. If you use this as an estimator, it will have exactly the same mean

and variance as the null source [1].

But seriously, I assume you mean something else. I recommend reading

http://gnuradio.org/trac/wiki/Tutorials/WritePythonApplications

that, should cover the basics (assuming you want to use Python).

Martin

[1] They are both zero, by the way.