Patent ID: 11867735
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 11:
12. A transmitter configured to determine voltage standing wave ratios, VSWR, of an antenna array having multiple subarrays, each subarray having two branches, each of the two branches having different polarizations so that a subarray is dual-polarized, the transmitter comprising:
for each group of a plurality of branches of the antenna array, a plurality of couplers, each coupler connected to a branch in a group, each group being formed so that nearest branches in a group differ in polarization and so that nearest branches in a row of branches in the group are separated by at least one branch not in the group;
a first set of combiners configured to combine reflected signals from first ports of the couplers of a group to produce a first signal YREFL;
a second combiner configured to combine forward signals from second ports of the couplers of the group to produce a second signal YFWD; and
a processor configured to:
calculate a reflected power PREFL from a product of the first signal YREFL and a matrix X of orthogonal signals corresponding to transmission signals coupled to the branches of the group;
calculate a forward power PFWD from a product of the second signal YFWD and the matrix X; and
calculate a VSWR for the group based on the reflected power PREFL and the forward power PFWD.