An apparatus comprising: a processor, wherein the processor is configured to receive transmissions via one or more receive antennas , wherein the processor is configured to: receive, via the one or more receive antennas , a signal comprising four pilot patterns transmitted by four transmit antennas, respectively, wherein the four pilot patterns are received at respective sets of pilot symbol positions in a first time interval, and wherein the first time interval spans a seven orthogonal frequency division multiplexing, OFDM, symbol durations in time and a plurality of subcarriers in frequency, wherein each of the pilot patterns is scattered in the first time interval, wherein the sets of pilot symbol positions are disjoint, wherein the pilot symbol positions in the first time interval collectively comprise: a first set of two pilot symbol positions at a first subcarrier and in first consecutive OFDM symbols; a second set of two pilot symbol positions in a second OFDM symbol, wherein one pilot symbol position of the second set of two pilot symbol positions is on the first subcarrier, wherein the first consecutive OFDM symbols and the second OFDM symbol are non-consecutive with each other in time. a processor, wherein the processor is configured to receive transmissions via one or more receive antennas , wherein the processor is configured to: receive, via the one or more receive antennas , a signal comprising four pilot patterns transmitted by four transmit antennas, respectively, wherein the four pilot patterns are received at respective sets of pilot symbol positions in a first time interval, and wherein the first time interval spans a seven orthogonal frequency division multiplexing, OFDM, symbol durations in time and a plurality of subcarriers in frequency, wherein each of the pilot patterns is scattered in the first time interval, wherein the sets of pilot symbol positions are disjoint, receive, via the one or more receive antennas , a signal comprising four pilot patterns transmitted by four transmit antennas, respectively, wherein the four pilot patterns are received at respective sets of pilot symbol positions in a first time interval, and wherein the first time interval spans a seven orthogonal frequency division multiplexing, OFDM, symbol durations in time and a plurality of subcarriers in frequency, wherein each of the pilot patterns is scattered in the first time interval, wherein the sets of pilot symbol positions are disjoint, wherein the pilot symbol positions in the first time interval collectively comprise: a first set of two pilot symbol positions at a first subcarrier and in first consecutive OFDM symbols; a second set of two pilot symbol positions in a second OFDM symbol, wherein one pilot symbol position of the second set of two pilot symbol positions is on the first subcarrier, wherein the first consecutive OFDM symbols and the second OFDM symbol are non-consecutive with each other in time. a first set of two pilot symbol positions at a first subcarrier and in first consecutive OFDM symbols; a second set of two pilot symbol positions in a second OFDM symbol, wherein one pilot symbol position of the second set of two pilot symbol positions is on the first subcarrier, wherein the first consecutive OFDM symbols and the second OFDM symbol are non-consecutive with each other in time. <EOS>