Forums

Any hint as per how to filter out awgn?

Started by awe peter July 31, 2009
Hi all.
Pleasei have a problem to solve. In mysignal processing through a multipath channel, i need to introduce awgn but i also realize that the lower the SNR introduced the morethe BER.I need to filter out this noise. Can anyone please help meoutas per how to go about it in matlab.
Thank you.
Correspondence Address:
Awe, Olusegun Peter
Electronic & Electrical Engineering Dept.
Obafemi Awolowo University,
Ile-Ife, Nigeria.
> Alternative e-mail: a...@oauife.edu.ng
Hi Awe Peter,

AWGN is an unavoidable phenomenon in electronic circuits. The only way
(AFAIK) to reduce its impact is to average your estimate over multiple
symbols in order to "average out" the noise. For e.g., in OFDM channel
estimation in the frequency domain, the channel responses at the pilot
subcarriers are averaged over multiple symbols in order to mitigate the
impact of AWGN at these subcarriers.

HTH,
Sameer

On Fri, Jul 31, 2009 at 3:35 AM, awe peter wrote:

> Hi all.
> Please i have a problem to solve. In my signal processing through a
> multipath channel, i need to introduce awgn but i also realize that the
> lower the SNR introduced the more the BER. I need to filter out this noise.
> Can anyone please help me out as per how to go about it in matlab.
> Thank you.
>
> Correspondence Address:
> Awe, Olusegun Peter
> Electronic & Electrical Engineering Dept.
> Obafemi Awolowo University,
> Ile-Ife, Nigeria.
> > Alternative e-mail: a...@oauife.edu.ng
>
>
>