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List:       gnuradio-discuss
Subject:    Re: Constellation object for ASK
From:       Marcus_Müller <marcus.mueller () ettus ! com>
Date:       2024-03-22 11:09:57
Message-ID: 9dce6d0d-ba8b-4e97-b458-23c1295a4b2a () ettus ! com
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Hi,

that would be called "OOK", on-off-keying, usually, because 0 ·3 = 0; it has very low 
spectral efficiency. Its constellation points would hence be 0 and 3, so the argument to 
the constellation object would be [0, 3].

Do note that by default, SDR frontend drivers are configured to map numbers with magnitude 
1 to maximum DAC output; you using 3 does sound a bit questionable here, unless you use 
that constellation then in a different more complex system and adjust the amplitude of the 
result.

Best regards,
Marcus


On 21.03.24 17:32, Sourya Saha wrote:
> Hi.
> I was wondering what would the parameters of the constellation object be if I am doing 
> ASK modulation by multiplying each bit with a constant 3?
>

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