Re: [Discuss-gnuradio] Channel Model Block in GNU radio

[Marcus Müller]

Hi Merry,

I want to know how to define the parameter 'taps' in the channel model blocks.I am considering a 4 tap system.

The taps *define* what your channel is. We can't tell you what taps your channel has -- that is completely defined by what you want your channel to be.
Since you already know that you're considering a 4-tap system: Take your channel impulse response, and put it in your taps field like
[h_0, h_1, h_2, h_3]
with h_n being the nth coefficient of your tapped delay line channel model.

Greetings,
Marcus

On 03/20/2015 07:19 AM, Merry Dominic wrote:

Thank You so much sir.

First, I am sorry to say that i meant 4 samples per symbol.I am working with the basic channel model in GNU.( gr::channels::channel_model ).What i understood is that it is a static (not time varying channel) awgn channel.I want to know how to define the parameter 'taps' in the channel model blocks.I am considering a 4 tap system.

I am afraid if i am not good enough to convey my issues.Still, looking forward for your reply

Thanks

Merry

On 19 March 2015 at 18:25, Marcus Müller <address@hidden> wrote:

Hi Merry,

the taps characterize the channel you want to simulate, so you will need to calculate these based on your mathematical channel model. The classical multipath channel model is a tapped-delay line-model, and that kind of directly maps to the concept of filter taps.

Are you sure you do 4 samples per second? That seems to be incredible little, especially when working with channel impulse responses.

Greetings,
Marcus

On 03/19/2015 06:55 AM, Merry Dominic wrote:

Hi,

I am working on the channel model block in GNU radio. I am confused in setting up the taps.I have a random source that undergoes a QPSK modulation at 4 samples per second.Could you please explain me the concept under setting the tap values.

I am supposed to use a polyphase clock synchronizer followed by a CMA equalizer for analyzing the channel response.

Looking forward for your reply.

Thanks

Merry

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