A method of receiving a downlink data channel from a base station, BS, by a user equipment, UE, in a long term evolution, LTE, communication system, the method comprising: receiving information representing whether or not to use a second demodulation reference signal, DMRS, parameter table instead of a first DMRS parameter table via a higher layer; receiving a downlink control channel carrying information indicating one parameter set among a plurality of parameter sets included in the first DMRS parameter table or the second DMRS parameter table; and receiving the downlink data channel using the DMRS identified based on the one parameter set indicated by downlink control channel, wherein each of the plurality of parameter sets included in the first DMRS parameter table includes one of antenna port indexes of a first antenna port group of the DMRS for a single antenna port transmission, and wherein each of the plurality of parameter sets included in the second DMRS parameter table includes one of both antenna port indexes of the first antenna port group and antenna port indexes of a second antenna port group of the DMRS for the single antenna port transmission, wherein: each of the plurality of parameter sets included in the first DMRS parameter table further comprises a scrambling identity for the single antenna port transmission, and each of the plurality of parameter sets included in the second DMRS parameter table further comprises the scrambling identity and a length of an orthogonal cover code, OCC, for the single antenna port transmission. receiving information representing whether or not to use a second demodulation reference signal, DMRS, parameter table instead of a first DMRS parameter table via a higher layer; receiving a downlink control channel carrying information indicating one parameter set among a plurality of parameter sets included in the first DMRS parameter table or the second DMRS parameter table; and receiving the downlink data channel using the DMRS identified based on the one parameter set indicated by downlink control channel, wherein each of the plurality of parameter sets included in the first DMRS parameter table includes one of antenna port indexes of a first antenna port group of the DMRS for a single antenna port transmission, and wherein each of the plurality of parameter sets included in the second DMRS parameter table includes one of both antenna port indexes of the first antenna port group and antenna port indexes of a second antenna port group of the DMRS for the single antenna port transmission, wherein: each of the plurality of parameter sets included in the first DMRS parameter table further comprises a scrambling identity for the single antenna port transmission, and each of the plurality of parameter sets included in the second DMRS parameter table further comprises the scrambling identity and a length of an orthogonal cover code, OCC, for the single antenna port transmission. each of the plurality of parameter sets included in the first DMRS parameter table further comprises a scrambling identity for the single antenna port transmission, and each of the plurality of parameter sets included in the second DMRS parameter table further comprises the scrambling identity and a length of an orthogonal cover code, OCC, for the single antenna port transmission. <EOS>