Patent ID: 8842762

Claim:
A method comprising: storing in a non-transitory computer readable memory of an apparatus a number R of user equipment reserved demodulation reference signal resources for single user multiple input multiple output transmissions, in which R is an integer greater than one; associating in the memory for a first transmission instance each of the R demodulation reference signal resources with a unique one of R spatial layers or R transmit antennas; associating in the memory for a second transmission instance each of the R demodulation reference signal resources with a different unique one of the R spatial layers or transmit antennas, in which the second transmission instance is consecutive with the first transmission instance; communicating in the first transmission instance all of the respective R demodulation reference signal resources on all of the corresponding unique R spatial layers or R transmit antennas; and communicating in the second transmission instance all of the respective R demodulation reference signal resources on all of the corresponding different unique R spatial layers or R transmit antennas, wherein the R demodulation reference signal resources used in the consecutive first and second transmission instance are varied to randomize interference and improve a signal to interference plus noise ratio of demodulation reference signals transmitted in the consecutive first and second transmission instance.