Patent ID: 8559354

Claim:
A method of transmitting data in a Multimedia Broadcast multicast service Single Frequency Network (MBSFN) subframe in a wireless communication system, the method comprising: transmitting a physical downlink control channel (PDCCH) to a user equipment in a first orthogonal frequency division multiplexing (OFDM) symbol; transmitting reference signals for a plurality of extended antenna ports to the user equipment in a second OFDM symbol by mapping the reference signals to subcarriers; and transmitting a physical downlink shared channel (PDSCH) to the user equipment in the second OFDM symbol by mapping the PDSCH to remaining subcarriers other than the subcarriers to which the reference signals are mapped, wherein each of the reference signals for the plurality of extended antenna ports is subjected to code division multiplexing (CDM), and wherein the reference signals for the plurality of extended antenna ports are divided into subsets not having a common element when subjected to the CDM.