Patent ID: 8755311

Claim:
A transceiver of a network node in a Time Division Duplex (TDD) cellular telecommunications system in which there are downlink (DL) periods and uplink (UL) periods separated by guard periods (GPs), said transceiver comprising: a transmitter part adapted for Long Term Evolution (LTE) communications and comprising at least first and second transmitters; a receiver part with at least one receiver; a power meter; a diverting circuit configured to divert at least part of respective transmitted signals from each of the first and second transmitters of the network node to the at least one receiver of the receiver part of the network node, wherein the diverting circuit is connected to the transmitter part via a switch; and a delay component; wherein the power meter is adapted to activate said switch to a diversion position that diverts at least the part of the respective transmitted signals from the first and second transmitters of the network node to form diverted signals when the output power of the transmitted signals falls below a first predefined threshold, wherein the delay component is adapted to delay the diverted signals so that the diverted signals are received by the receiver part during one of the guard periods, wherein the transceiver further comprises a comparator for comparing the diverted signals from the first and second transmitters to each other after reception through the at least one receiver, and calibrating the transmitters based on said comparison.