Re: [Discuss-gnuradio] Demodulating APCO P25 signals

[Johnathan Corgan]

On 2/19/08, Tom Rondeau <address@hidden> wrote:

> The idea here is to minimize the phase
> transition between successive symbols so the maximum is +135 degrees
> instead of +180. It's a minor change in the modulator that helps lower
> the bandwidth of the signal.

This prevents the passband envelope from passing through zero
amplitude, and allows the transmitter PA more leeway in terms of
linearity and spectral regrowth.

-- 
Johnathan Corgan
Corgan Enterprises LLC
http://corganenterprises.com/