gmr1_rx: Don't count the borders when computing energy

Since the 'burst' vector often include some margin, the center
will be more representative of the real average energy.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gmr1_rx.c b/src/gmr1_rx.c
index 56a3dda..fb138e2 100644
--- a/src/gmr1_rx.c
+++ b/src/gmr1_rx.c
@@ -170,7 +170,8 @@ burst_energy(struct osmo_cxvec *burst)
 {
 	int i;
 	float e = 0.0f;
-	for (i=0; i<burst->len; i++)
+	int b = (burst->len >> 5); /* exclude the borders */
+	for (i=b; i<burst->len-b; i++)
 		e += osmo_normsqf(burst->data[i]);
 	e /= burst->len;
 	return e;