Patent ID: 8400907

Claim:
A user equipment (UE) receiving a plurality of reference signals in a wireless multiple-input multiple-output (MIMO) communication system, the UE comprising: a transceiver configured for receiving the plurality of reference signals for multiple antennas in a sub-frame, the sub-frame comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain over a plurality of sub-carriers in a frequency domain, wherein: a first array is repeated in the frequency domain on a first OFDM symbol of the sub-frame, a second array is repeated in the frequency domain on a second OFDM symbol of the sub-frame and a third array is repeated in the frequency domain on a third OFDM symbol of the sub-frame, each of the first, second and third arrays consists of six contiguous subcarrier in the frequency domain, a first subcarrier and a fourth subcarrier of the six contiguous subcarriers of each of the first, second and third arrays are allocated with reference signals of the plurality of reference signals, the first and fourth subcarriers of the six contiguous subcarriers of each of the first, second and third arrays are directly followed by two contiguous data subcarriers, a first reference signal “T 1 ” for a first antenna is allocated on the first subcarrier in the first array and the fourth subcarrier in the third array, a second reference signal “T 2 ” for a second antenna is allocated on the fourth subcarrier in the first array and the first subcarrier in the third array, a third reference signal “T 3 ” for a third antenna is allocated on the first subcarrier in the second array, and a fourth reference signal “T 4 ” for a fourth antenna is allocated on the fourth subcarrier in the second array, fourth and fifth OFDM symbols which do not include the plurality of reference signals are allocated between the second OFDM symbol and the third OFDM symbol, and sixth and seventh OFDM symbols which do not include the plurality of reference signals are allocated, such that the sixth OFDM symbol is contiguous with the third OFDM symbol, and the seventh OFDM symbol is contiguous with the sixth OFDM symbol.