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Re: [Discuss-gnuradio] Demodulating APCO P25 signals

From: Johnathan Corgan
Subject: Re: [Discuss-gnuradio] Demodulating APCO P25 signals
Date: Tue, 19 Feb 2008 11:47:10 -0800

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

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