HopeRF feedback

Werner Almesberger werner at openmoko.org
Thu Jun 24 19:16:10 EDT 2010


JDH services wrote:
> On 6/24/10, Werner Almesberger <werner at openmoko.org> wrote:
>>  MSK is a special configuration of FSK:
> 
> "MSK can also be viewed as a continuous phase frequency shift keyed
> (CPFSK) signal with a frequency separation of one-half the bit rate."
> from  http://en.wikipedia.org/wiki/Minimum-shift_keying

Yes, MSK is a CPFSK is an FSK [1, 2] is an FM. Silabs don't mention
explicitly that their FSK has continuous phase. However, their use
of a VCO (as opposed to a pair of oscillators as shown in [3])
strongly suggests this. For (GMSK is a) GFSK, only continuous phase
would make sense anyway.

[1] http://en.wikipedia.org/wiki/Continuous_phase_modulation#Continuous-phase_frequency-shift_keying
[2] http://www.dip.ee.uct.ac.za/~nicolls/lectures/eee482f/17_cfskmsk.pdf
[3] http://www.dip.ee.uct.ac.za/~nicolls/lectures/eee482f/13_fsk_2up.pdf

- Werner




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