Thanks Marcus
Pulse shape and repetition frequency determine bandwidth then ?
Square is the worst - gausian is better ?
- Andrew -
----- Original Message -----
From: "Marcus Müller" <mar...@hostalia.de>
To: "Andrew Rich" <vk4...@tech-software.net>
Cc: <discuss-gnuradio@gnu.org>
Sent: Thursday, January 30, 2014 5:27 PM
Subject: Re: Modulation question
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Hi Andrew,
just a quick heads-up: I nearly missed your message because it was
hidden in another thread, since you seem to have hit reply and changed
subject and text; however, my mail client recognized the In-Reply-To
header, and sorted you in - please directly write mails unless you
actually mean to reply.
So now for your question
Ads-b uses a 1 MHz pulse position modulation scheme
On 30.01.2014 01:22, Andrew Rich wrote:
Ads-b uses a 1 MHz pulse position modulation scheme
Is this possible to create on gnu ?
GNU Radio is only a software radio framework. Basically you can do
anything with it that can be done in baseband signal of a sample rate
that your ADC/DAC and mixers (and analog filters, amps and so on) support.
With gr-air-modes there is a comfortable receiver implemented in GNU
Radio, and as a not-to-rough simplification you can transmit
everything with a software radio that you can receive with one.
Is it the data rate that makes the spectrum wide ? 7 MHz ?
Ok, I don't really understand your question, could you please elaborate?
Reception of ADB-S works quite well with a 4MHz sampling bandwidth,
but I'm not quite sure on the technical requirements of ADB-S
transmission.
The actual bandwidth of PPM systems of course depends on pulse shape
and pulse frequency.
Hope I was able to help a little,
Marcus
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