From de1460aa9438f6a466a5fe4455ed968033d4ecdb Mon Sep 17 00:00:00 2001
From: tvoid <tvoid@lesaige.com>
Date: Tue, 15 Apr 2008 15:09:00 -0600
Subject: added m&m to burst_cf doubles to floats

---
 gsm-tvoid/src/lib/mm_c.cc | 73 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 gsm-tvoid/src/lib/mm_c.cc

(limited to 'gsm-tvoid/src/lib/mm_c.cc')

diff --git a/gsm-tvoid/src/lib/mm_c.cc b/gsm-tvoid/src/lib/mm_c.cc
new file mode 100644
index 0000000..7b3e335
--- /dev/null
+++ b/gsm-tvoid/src/lib/mm_c.cc
@@ -0,0 +1,73 @@
+
+#include "mm_c.h"
+
+mm_c::mm_c(float omega):
+	d_omega(omega),
+	d_mu(0.5),
+	d_x_1(0.0,0.0),
+	d_x_2(0.0,0.0),
+	d_a_1(0.0,0.0),
+	d_a_2(0.0,0.0),
+	d_gain_mu(0.01),
+	d_gain_omega(0.25 * d_gain_mu * d_gain_mu)
+{}
+
+
+gr_complex mm_c::slicer(gr_complex x)
+{
+	float real=SLICE_0_R, imag=SLICE_0_I;
+	
+	if(x.real() > 0.0)
+		real = SLICE_1_R;
+	
+	if(x.imag() > 0.0)
+		imag = SLICE_1_I;
+	
+	return gr_complex(real,imag);
+}
+
+float mm_c::update(gr_complex x_0, gr_complex a_0)
+{
+	//mm vars
+	gr_complex x,y,u;
+	
+	x = (a_0 - d_a_2) * conj(d_x_1);
+	y = (x_0 - d_x_2) * conj(d_a_1);
+	u = y - x;
+	d_mm = u.real();		//error signal
+	
+	//limit d_mm
+	if (d_mm > 1.0) d_mm = 1.0;
+	else if (d_mm < -1.0) d_mm = -1.0;
+
+	//error feedback
+	d_omega = d_omega + d_gain_omega * d_mm;
+	
+	//limit omega
+/*		
+	if (d_omega > d_max_omega)
+		d_omega = d_max_omega;
+	else if (d_omega < d_min_omega)
+		d_omega = d_min_omega;
+*/
+	//update mu		
+	d_mu = d_mu + d_omega + d_gain_mu * d_mm;
+	//process mu / ii advances after burst processing for burst timing
+	
+	//update delay taps
+	d_x_2 = d_x_1;
+	d_x_1 = x_0;
+	d_a_2 = d_a_1;
+	d_a_1 = a_0;
+
+	return d_mu;
+}
+
+
+float mm_c::update(gr_complex x_0)
+{
+	return update(x_0, slicer(x_0) );
+}
+
+
+
-- 
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