Patent ID: 7526039

Claim:
A method for deciding a signal detection order that minimizes an error probability in an SM-MIMO (Spatial Multiplexing Multiple Input Multiple Output) system using an equal power and adaptive modulation rate for a plurality of antennas, the method comprising the steps of: obtaining an effective SINR (Signal to Interference pulse Noise Ratio), in an effective SIR (Signal to Interference Ratio) and bit loading calculation unit, for each detection order; selecting from among the detection orders, in said effective SIR and bit loading calculation unit, the detection order that maximizes a channel, in which a product of a minimum symbol distance for each modulation rate and the effective SINR becomes minimum through performance of a bit allocation with respect to the detection orders; receiving signals through the plurality of antennas in accordance with the selected detection order; and wherein the selection of the detection order is performed by max i ⁡ ( detection ⁢ ⁢ order ) ⁢ ( min k ⁡ ( T × antenna ) ⁢ g M ik ⁢ γ ik r i ) where, i denotes an index of the detection order, k denotes an index of the transmitting antenna, g M denotes a constant corresponding to the minimum symbol distance given according to the modulation rate, γ denotes a signal to interference ratio by the channel, and r denotes the effective number of substreams which load at least one bit.