OT - Digital Mode Definition

[JHRichards]

Say ... does anyone know if  8 PSK - 8 Point Phase Shift Keying is a
form of MSK - Minimum Shift Keying?

Does anyone know where I can go to research the answer?

(Not my career field, so this is a bit over my head, but I try my best
to keep up!)

THANK YOU.    K8JHR
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[Rich NE1EE]

On 2020-10-03 02:50:-0400, JR wrote:

>Say ... does anyone know if�  8 PSK - 8 Point Phase Shift Keying is a form of MSK - Minimum Shift Keying?
>
>Does anyone know where I can go to research the answer?

I have not delved deeply into any of these modes, but I have related experience. PSK is Phase Shift Keying; MSK is a variant of Freq Shift Keying. They are related by the class of math formulas that generate the signals, but differ significantly in operation.

It seems to me that MSK requires much simpler engineering than PSK. In days of yore, this would have been important, but with so much processing embedded on chips these days, it seems to me to be less important.

I'm sure that there is a wealth of info on the web, but a handicap may be point of view. OTOH you will find the math tedious to wade through, but will give you a good understanding of both. OTO, I have not seen a good comparison of the two that addresses the engineering costs versus the performance of each.


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[Joe Subich, W4TV-4]

On 2020-10-03 2:50 AM, JR wrote:
 > Say ... does anyone know if  8 PSK - 8 Point Phase Shift Keying is a
 > form of MSK - Minimum Shift Keying?

No.  MSK is two tone FSK where the shift is one half of the baud
rate.  For example, if one were using the amateur 45.45 baud, the
shift for MSK would be 23 (22.725) Hz.

8PSK is phase shift keying with 8 states (0, 45, 90, 135, 180, 225,
270, 315 degrees).  8PSK is a form of PSK along with BPSK, QPSK, etc.

73,

    ... Joe, W4TV


On 2020-10-03 2:50 AM, JR wrote:
> Say ... does anyone know if  8 PSK - 8 Point Phase Shift Keying is a
> form of MSK - Minimum Shift Keying?
>
> Does anyone know where I can go to research the answer?
>
> (Not my career field, so this is a bit over my head, but I try my best
> to keep up!)
>
> THANK YOU.    K8JHR


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