A method of supporting positioning, comprising: receiving a plurality of signals from each of multiple transmitters at a receiver; and determining a time of arrival, TOA, of the plurality of signals from each transmitter based on a first signal sent by the transmitter on a first set of subcarriers and a second signal sent by the transmitter on a second set of subcarriers, the plurality of signals comprising the first and second signals; and wherein the determining the TOA of the plurality of signals from each transmitter comprises: performing correlation for the first signal from the transmitter to obtain first correlation results for a plurality of time offsets, performing correlation for the second signal from the transmitter to obtain second correlation results for the plurality of time offsets, combining the first and second correlation results to obtain combined correlation results for the transmitter, and determining the TOA for the transmitter based on the combined correlation results; characterised in that: the first signal comprises a reference signal sent on the first set of non-contiguous subcarriers, and the second signal comprises a synchronization signal sent on the second set of contiguous subcarriers; and wherein the first set includes non-contiguous subcarriers distributed across system bandwidth, and wherein the second set includes contiguous subcarriers in a center portion of the system bandwidth. receiving a plurality of signals from each of multiple transmitters at a receiver; and determining a time of arrival, TOA, of the plurality of signals from each transmitter based on a first signal sent by the transmitter on a first set of subcarriers and a second signal sent by the transmitter on a second set of subcarriers, the plurality of signals comprising the first and second signals; and wherein the determining the TOA of the plurality of signals from each transmitter comprises: performing correlation for the first signal from the transmitter to obtain first correlation results for a plurality of time offsets, performing correlation for the second signal from the transmitter to obtain second correlation results for the plurality of time offsets, combining the first and second correlation results to obtain combined correlation results for the transmitter, and determining the TOA for the transmitter based on the combined correlation results; characterised in that: the first signal comprises a reference signal sent on the first set of non-contiguous subcarriers, and the second signal comprises a synchronization signal sent on the second set of contiguous subcarriers; and wherein the first set includes non-contiguous subcarriers distributed across system bandwidth, and wherein the second set includes contiguous subcarriers in a center portion of the system bandwidth. performing correlation for the first signal from the transmitter to obtain first correlation results for a plurality of time offsets, performing correlation for the second signal from the transmitter to obtain second correlation results for the plurality of time offsets, combining the first and second correlation results to obtain combined correlation results for the transmitter, and determining the TOA for the transmitter based on the combined correlation results; characterised in that: the first signal comprises a reference signal sent on the first set of non-contiguous subcarriers, and the second signal comprises a synchronization signal sent on the second set of contiguous subcarriers; and wherein the first set includes non-contiguous subcarriers distributed across system bandwidth, and wherein the second set includes contiguous subcarriers in a center portion of the system bandwidth. the first signal comprises a reference signal sent on the first set of non-contiguous subcarriers, and the second signal comprises a synchronization signal sent on the second set of contiguous subcarriers; and wherein the first set includes non-contiguous subcarriers distributed across system bandwidth, and wherein the second set includes contiguous subcarriers in a center portion of the system bandwidth.