rfemu_gnuradio_zmq: fix amplitude conversion
fix dB to amplitude conversion and adjust max attenuation value
Change-Id: I5a94d5d31e7dc85ab37bd281f95374ad825a41ff
diff --git a/src/osmo_gsm_tester/obj/rfemu_gnuradio_zmq.py b/src/osmo_gsm_tester/obj/rfemu_gnuradio_zmq.py
index c5398a9..3725760 100644
--- a/src/osmo_gsm_tester/obj/rfemu_gnuradio_zmq.py
+++ b/src/osmo_gsm_tester/obj/rfemu_gnuradio_zmq.py
@@ -188,11 +188,12 @@
def set_attenuation(self, db):
for cell in self.enb.gen_conf['enb']['cell_list']:
if int(cell['cell_id']) == self.cell_id:
- max_att_db = self.get_max_attenuation()
- self.broker.cmd_set_relative_gain_on_local_port(cell['zmq_enb_peer_port'], (max_att_db - db)/max_att_db)
+ # convert negative dB to amplitude
+ amp = pow(10, -db/20.0)
+ self.broker.cmd_set_relative_gain_on_local_port(cell['zmq_enb_peer_port'], amp)
break
def get_max_attenuation(self):
- return 12 # maximum cell_gain value in srs. Is this correct value?
+ return 200
# vim: expandtab tabstop=4 shiftwidth=4