Apparatus and method for reception in multi-input multi-output system

A method for calculating a signal weight in a received (RX) signal decoding device in a wireless communication system using a multi-input multi-output (MIMO) system, the method comprising:

• multiplexing, corresponding to RX antennas, a data stream corresponding to a weight inputted corresponding to the number of transmission/reception (TX/RX) antennas;
• multiplying the multiplexed data;
• latching the multiplication result by a double-rate clock two time higher than a predetermined rate prior to output;
• adding the multiplication result value and the latched value;
• and
• latching the addition result by the clock prior to output.

An apparatus for calculating a log likelihood ratio (LLR) inputted from a linear receiver into a decoder in a wireless communication system using a multi-input multi-output (MIMO) scheme, the apparatus comprising:

• an MIMO receiver configured to output MIMO signals, which are inputted respectively from transmission (TX) antennas into reception (RX) antennas, in such a way to divide the MIMO signals into imaginary components and real components on an RX antenna basis;
• a first multiplexer configured to select a predetermined normalization value corresponding to each modulation scheme;
• a first multiplier configured to multiply each of the output signals of the MIMO receiver by the normalization value of the first multiplexer;
• and
• an LLR extractor configured to calculate an LLR value for each of the outputs of the first multiplier by using a normalization value of a constellation corresponding to the modulation scheme of a received signal.

A method for calculating a log likelihood ratio (LLR) inputted from a linear receiver into a decoder in a wireless communication system using a multi-input multi-output (MIMO) scheme, the method comprising:

• outputting MIMO signals, which are inputted respectively from transmission (TX) antennas into reception (RX) antennas, in such a way to divide the MIMO signals into imaginary components and real components on an RX antenna basis;
• multiplying each of the output signals divided into the imaginary and real components by a predetermined normalization value corresponding to each modulation scheme;
• and
• calculating an LLR value for each of the multiplication result values by using a normalization value of a constellation corresponding to the modulation scheme of a received signal.