From 504ab76d9e4fc3e9f497b9fd34f01c1bad346a5d Mon Sep 17 00:00:00 2001
From: ghostop14 <ghostop14@gmail.com>
Date: Fri, 14 Feb 2020 11:47:37 -0500
Subject: gr-digital: Improve PLL Loops and Clock Recovery
These updates incorporate the same inlining of loop functions and
the newly pushed fast_cc_multiply function to ensure
consistent performance improvements across systems that do not
support the cx-limited-range compiler parameter (Macs and Windows).
---
gr-digital/lib/clock_tracking_loop.cc | 54 -----------------------------------
1 file changed, 54 deletions(-)
(limited to 'gr-digital/lib/clock_tracking_loop.cc')
diff --git a/gr-digital/lib/clock_tracking_loop.cc b/gr-digital/lib/clock_tracking_loop.cc
index 6c04d2d87..2cb7c996c 100644
--- a/gr-digital/lib/clock_tracking_loop.cc
+++ b/gr-digital/lib/clock_tracking_loop.cc
@@ -101,60 +101,6 @@ void clock_tracking_loop::update_gains()
set_beta(beta);
}
-void clock_tracking_loop::advance_loop(float error)
-{
- // So the loop can be reverted one step, if needed.
- d_prev_avg_period = d_avg_period;
- d_prev_inst_period = d_inst_period;
- d_prev_phase = d_phase;
-
- // Integral arm of PI filter
- d_avg_period = d_avg_period + d_beta * error;
- // Limit the integral arm output here, as a large negative
- // error input can lead to a negative d_avg_period, which
- // will cause an infitine loop in the phase wrap method.
- period_limit();
-
- // Proportional arm of PI filter and final sum of PI filter arms
- d_inst_period = d_avg_period + d_alpha * error;
- // Limit the filter output here, for the errant case of a large
- // negative error input, that can lead to a negative d_inst_period,
- // which results in an incorrect phase increment, as it is assumed
- // to be moving forward to the next symbol.
- if (d_inst_period <= 0.f)
- d_inst_period = d_avg_period;
-
- // Compute the new, unwrapped clock phase
- d_phase = d_phase + d_inst_period;
-}
-
-void clock_tracking_loop::revert_loop()
-{
- d_avg_period = d_prev_avg_period;
- d_inst_period = d_prev_inst_period;
- d_phase = d_prev_phase;
-}
-
-void clock_tracking_loop::phase_wrap()
-{
- float period = d_avg_period; // One could argue d_inst_period instead
- float limit = period / 2.0f;
-
- while (d_phase > limit)
- d_phase -= period;
-
- while (d_phase <= -limit)
- d_phase += period;
-}
-
-void clock_tracking_loop::period_limit()
-{
- if (d_avg_period > d_max_avg_period)
- d_avg_period = d_max_avg_period;
- else if (d_avg_period < d_min_avg_period)
- d_avg_period = d_min_avg_period;
-}
-
/*******************************************************************
* SET FUNCTIONS
*******************************************************************/
--
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