Apparatus and method for adaptively modulating signal by using layered time-space detector used in mimo system

An apparatus for adaptively demodulating signal in a MIMQ system having a layered space-time architecture based detector, the apparatus comprising:

• MIMO channel estimation means for estimating MIMO channel from a signal received through each receiving antenna;
• a bit and power allocation information calculator for determining an equivalent channel gain in reverse order of Vertical-Bell laboratories Space Time (V-BLAST) based on MIMO channel information from the MIMO channel estimation means and determining the number of bits to be transmitted from each transmitting antenna by using the equivalent channel gain;
• and
• adaptive demodulation means for demodulating signal of each layer with corresponding modulation method based on the determined number of bits and the MIMO channel information.

A method for adaptively demodulating in a multi input and multi output system, the method comprising the steps of:

• a) estimating a channel from a signal received at each receiving antenna;
• b) deciding an equivalent channel gain in a reverse order of a vertical-bell laboratories space time (V-BLAST) based on the channel information;
• and
• c) detecting and adaptively demodulating by deciding the number of bits based on the equivalent channel gain.

A computer readable recoding medium storing instructions for executing a method for adaptively demodulating signals, the method comprising the steps of:

• a) estimating a channel from a signal received from each receiving antenna;
• b) deciding an equivalent channel gain in a reverse order of V-BLAST based on the channel information;
• and
• c) detecting and adaptively demodulating by deciding the number bits transmitted from the each transmitting antenna based on the equivalent channel gain.