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From: | Ed Criscuolo |
Subject: | Re: [Discuss-gnuradio] Decoding CPFSK |
Date: | Tue, 23 Oct 2007 11:32:56 -0400 |
User-agent: | Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.13) Gecko/20060414 |
Andrew Rose wrote:
2. 1200Hz/1800Hz continuous-phase FSK encoding 1200 bits per second. i.e. each output bit is either 1 cycle of a 1200Hz wave (1-bit) or 1.5 cycles of an 1800Hz wave (0-bit). The start of each bit is at a zero-crossing (although there are obviously zero-crossings which aren't the start of a bit).
What you are describing is called Mean Shift Keying. It is a specialized form of FSK that is designed to have more efficient
bandwidth utilization. I would guess that you could use the Gaussian Mean Shift Keying (GMSK) demodulator, or construct your own using a quadrature demodulator and a root-rased-cosine filter. @(^.^)@ Ed
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