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Reply To: optimization

#48810
pix
Guest

antenna diveersity can be either DL TX, or UL RX, or both. It just means you have two signals transmitted from different antennas, or different branches.

If you have a cell connected to a crosspolar antenna, it is probable that each branch will be used to receive the UL signal. This is UL space diversity. You have one branch with RX-A and one branch with RX-B.

The signal FROM the BTS is transmitted on only one branch. There is only TX-A.

If you want to use DL TX diversity, it means you want to use the second branch to send TX-B.
What do you need to do ? Duplex the RX-B signal and the TX-B signal. Most probably, it means you need :
1. a new type of TRX (with 2 TX output)
2. to re-cable TRX-ANC jumpers

Beware that when using the 2 TX diversity, you’ll need to balance your path loss in uplink as well. You must increase sensitivity of the UL path, either with TMA or with 4 RX diversity.

Regards,
Pix