A method of wireless communication in an Orthogonal Frequency Division Multiplexing, OFDM, system, comprising: transmitting a first set of reference signals from a first transmit antenna on a plurality of reference signal, RS, resource elements (410, 412, 414, 416, 418) for a respective plurality of subcarriers within an OFDM symbol, the RS resource elements (410, 412, 414, 416, 418) representing a set of time and frequency resources; and transmitting a second set of reference signals from a second transmit antenna on the plurality of RS resource elements, wherein a first of the second set of reference signals transmitted from the second transmit antenna is identical to a first of the first set of reference signals transmitted from the first transmit antenna in a frequency domain; and a second of the second set of reference signals is identical to a first phase rotation of a second of the first set of reference signals in a frequency domain, such that the phase-rotated reference signals on the second transmit antenna are given by: X k δ = X k e -jKΔΦk, for k = 0,..., L-1, where L is the total number of RS subcarriers; and wherein the plurality of RS resource elements (410, 412, 414, 416, 418) are in a Physical Downlink Shared Channel, PDSCH, region of a Multicast-Broadcast Single Frequency Network, MBSFN, subframe; and the PDCCH region of the MBSFN subframe comprises conventional reference signals such that legacy UEs are able to make channel measurements using the conventional reference signals; wherein the first phase rotation ΔΦ is selected such that { K ⁢ Δ ⁢ φLT 2 ⁢ π > max i τ i N Tx K ⁢ Δ ⁢ φLT 2 ⁢ π ≤ 1 K ⁢ Δ ⁢ f where K is subcarrier separation, L is the total number of RS resource elements, T is the sampling time, T i represents maximum delay spread for links corresponding to the transmit antennas, i = 1,2, and Δf denotes subcarrier spacing and N Tx is the number of transmit antennas. transmitting a first set of reference signals from a first transmit antenna on a plurality of reference signal, RS, resource elements (410, 412, 414, 416, 418) for a respective plurality of subcarriers within an OFDM symbol, the RS resource elements (410, 412, 414, 416, 418) representing a set of time and frequency resources; and transmitting a second set of reference signals from a second transmit antenna on the plurality of RS resource elements, wherein a first of the second set of reference signals transmitted from the second transmit antenna is identical to a first of the first set of reference signals transmitted from the first transmit antenna in a frequency domain; and a second of the second set of reference signals is identical to a first phase rotation of a second of the first set of reference signals in a frequency domain, such that the phase-rotated reference signals on the second transmit antenna are given by: X k δ = X k e -jKΔΦk, for k = 0,..., L-1, where L is the total number of RS subcarriers; and a first of the second set of reference signals transmitted from the second transmit antenna is identical to a first of the first set of reference signals transmitted from the first transmit antenna in a frequency domain; and a second of the second set of reference signals is identical to a first phase rotation of a second of the first set of reference signals in a frequency domain, such that the phase-rotated reference signals on the second transmit antenna are given by: X k δ = X k e -jKΔΦk, for k = 0,..., L-1, where L is the total number of RS subcarriers; and wherein the plurality of RS resource elements (410, 412, 414, 416, 418) are in a Physical Downlink Shared Channel, PDSCH, region of a Multicast-Broadcast Single Frequency Network, MBSFN, subframe; and the PDCCH region of the MBSFN subframe comprises conventional reference signals such that legacy UEs are able to make channel measurements using the conventional reference signals; wherein the first phase rotation ΔΦ is selected such that { K ⁢ Δ ⁢ φLT 2 ⁢ π > max i τ i N Tx K ⁢ Δ ⁢ φLT 2 ⁢ π ≤ 1 K ⁢ Δ ⁢ f where K is subcarrier separation, L is the total number of RS resource elements, T is the sampling time, T i represents maximum delay spread for links corresponding to the transmit antennas, i = 1,2, and Δf denotes subcarrier spacing and N Tx is the number of transmit antennas.