Re: [Discuss-gnuradio] BER over air

[Mostafa Alizadeh]

I suddenly found a book which discussed SNR estimation which is also assumed the AWGN channel [1, chap. 6, p. 121]. This book also considers carrier phase and frequency uncertainties and developed a kind of compensation for them. 

Again I think we need to remove fading channel before SNR estimation. Is it true?

Best, 

Mostafa

[1] Jon Hamkins; Marvin Kenneth Simon,"Autonomous software-defined radio receivers for deep space applications",Wiley-Interscience, 2006.

On Sun, Dec 28, 2014 at 9:01 PM, Marcus Müller <address@hidden> wrote:

Hello Mostafa,

I've forgot to add that
"
> All nonlinear and time variant effects isn't just due to the channel
> but the RF hardware.
"
is usually not true -- again, SNR is signal to noise, and maybe your
signal undergoes correction, and I don't know if that is going to be
memoryless.
Far more importantly, real radio channels *are not* flat. They are
frequency-selective, and they are time-variant. In many (easier) cases,
you can consider the channel to be flat for your very limited bandwidth,
and you can consider it's properties (or at least the statistical
properties of these properties) to be stationary -- but if you're
serious about channel characteristics, you can't just say "my channel is
flat and time-invariant", without really saying why you can make these
simplifications.

Greetings,
Marcus

--

***********************************************************

Department of Electrical Engineering

Aboureyhan Building

MMWCL LAB

Amirkabir University Of Technology

Tehran

IRAN

Tel: +98 (919) 158-7730

LAB: http://ele.aut.ac.ir/~mmwcl/?page_id=411

Homepage: http://ele.aut.ac.ir/~alizadeh/

***********************************************************