Apparatus and method of transmitting and receiving reference signal in wireless communication system using multiple-input and multiple-output

A transmitter for transmitting Reference Signals (RSs) in a wireless communication system using Multiple Input Multiple Output (MIMO), comprising:

• an antenna unit including two or more antenna ports, each antenna port comprising one or more antennas;
• an RS creating unit configured to create RSs of different patterns, wherein a number patterns corresponds to the two or more antenna ports;
• a virtual antenna mapping unit (VAM) configured to map and output the RSs, output from the RS creating unit, to the one or more antennas, respectively;
• and
• a mapping signal creating unit configured to:
• determine a number of antennas to transmit RSs and a number of antenna ports of the two or more antenna ports,
• determine a number of patterns to transmit the RSs,
• determine a number of transmissions of the RSs based on the number of antennas and the determined number of antenna ports, wherein the determined number of patterns to transmit the RSs is equivalent to the determined number of transmissions of the RSs,
• create different transmit patterns that cyclically differ from each other over a period of time, wherein each transmit pattern, of the created transmit patterns, is provided to one antenna port of the number of antenna ports,
• map the RSs to the one or more antennas according to the created transmit patterns for each antenna port, and
• transmit the RSs based on an order the RSs are mapped to the one or more antennas.

A method of estimating a channel by using received Reference Signals (RSs) in a receiver of a wireless communication system using Multiple Input Multiple Output (MIMO) comprising:

• receiving, transmit pattern information about the RSs from a transmitter with two or more antenna ports, wherein each antenna port includes one or more antennas;
• receiving RSs of different patterns corresponding to a determined number of transmissions according to the received transmit pattern information from the transmitter, wherein each transmit pattern is cyclically different from each other, wherein the transmit pattern information indicates a number of the antenna ports and a number of antennas of the transmitter, and wherein the determined number of transmissions is based on the number of antennas of the transmitter to the number of the antenna ports of the transmitter, wherein the patterns are equivalent to the determined number of transmissions;
• and
• estimating, when patterns of a preset number of transmission are received, channels based on the received RSs of different patterns and the received transmit pattern information.