Method for transmitting reference signal for terminal demodulation in radio mobile communication system, and apparatus for implementing the same

An evolved Node-B (eNB) for transmitting dedicated reference signals (DRSs) in a radio mobile communication system, the eNB comprising:

• eight antenna ports;
• and
• a processor operatively connected to the eight antenna ports and configured to:
• map the DRSs for the eight antenna ports to a resource block according to DRS patterns;
• and
• transmit the DRSs in a downlink subframe by controlling the eight antenna ports,
• wherein:
• the DRS patterns are classified as a first pattern group and a second pattern group,
• the first pattern group includes four DRS patterns corresponding to four antenna ports among the eight antenna ports,
• the second pattern group includes four DRS patterns corresponding to remaining four antenna ports among the eight antenna ports,
• each of the DRS patterns is orthogonal to each other DRS pattern,
• resource element positions of the first pattern group are shifted by one (1) subcarrier as compared to resource element positions of the second pattern group, and
• the first pattern group and the second pattern group are defined in a same resource block, and
• wherein:
• the resource element positions of the first pattern group consist of twelve (12) resource elements in the resource block, and
• the resource element positions of the second pattern group consist of another twelve (12) resource elements in the same resource block.