No commit message

HowToCalibrateeNBandUE.md

@@ -33,4 +33,20 @@ To calibrate this paramter, set up the eNB and run the UE with the option `--cal
 It will transmit always a preamle 19 on the PRACH. Check the logs of the eNB and adjust the timing
 advance until it receives this preamble with a close to 0 delay.
 
--- @florian.kaltenberger - 12 Oct 2015
+### Tx-gain and Rx-gain
+
+To calibrate the Tx and Rx gain parameter you need to follow this steps :
+
+*1.You have to first set the attenuation between the eNB and the UE:
+
+The RSRP of the signal received on UE side should be between -75 and -95 dBm, so you have to set the attenuation to be in this range. 
+(See the screen shot in the Stats windows : RSRP[0] -85.32 dBm) 
+
+*2. The received signal on UE side should not saturate for this you have to play with Rx-gain
+(See the received signal in the LTE DL SCOPE UE of the scrren shot, also in the stats windows you can see that i am using Rx-gain 105 dB)
+
+*3 Same way as the Rx-gain you should calibrate the Tx-gain to not saturate the eNB.
+
+This three values of attenuation, Rx and Tx gain depend from your setup so you need to tune them properly.
+
+![ScreenShot](/uploads/53c955fd5c2c01c5109305e5f64efa69/ScreenShot.png)