Abstract: The present disclosure provides a base station for transmitting synchronisation signals on a plurality of carriers, wherein the base station includes processing circuitry and a machine-readable medium storing instructions which, when executed by the processing circuitry, cause the base station to apply a time shift to at least part of a first synchronisation signal to be sent by the base station on a first carrier of the plurality of carriers such that the at least part of the first synchronisation signal is offset in time from a second synchronisation signal to be sent on a second carrier of the plurality of carriers. The base station is further caused to combine signals for the plurality of carriers, including the first and second synchronisation signals, to form a combined signal, amplify the combined signal using a power amplifier, and transmit the amplified combined signal.