Patent ID: 7929417

Claim:
A method of allocating reference signals in a multiple-input multiple-output (MIMO) system, the reference signals allocated over a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols and a plurality of subcarriers, the method comprising: allocating a first reference signal, a second reference signal and a third reference signal in a first OFDM symbol so that the first reference signal, the second reference signal and the third reference signal do not overlap with each other; and allocating the first reference signal, the second reference signal and a fourth reference signal in a second OFDM symbol, wherein the first reference signal and the second reference signal are either allocated in regular intervals in the first OFDM symbol or allocated in regular intervals in the second OFDM symbol, and wherein all transmit powers for the first reference signal, the second reference signal and the third reference signal are the same in the first OFDM symbol.