Patent ID: 8351524
Filing Date: 2013-01-08
Classification: H04B,H04L

Abstract:
1. A Multiple-Input/Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) communication method for transmitting and receiving data by MIMO-OFDM communication, comprising the steps, on a transmitting side, of: performing precoding processing of transmission data using a prescribed precoding method; and performing OFDM modulation of the precoded data, and transmitting the modulated data from a plurality of transmission antennas, and comprising the steps, on a receiving side, of: performing MIMO decoding processing of reception signals received by a plurality of reception antennas, according to a Zero-Forcing (ZF) decoding algorithm or to a Minimum Mean Square Error (MMSE) decoding algorithm, and outputting transmission data stream; calculating a weighting coefficient according to the precoding method; and multiplying a path metric of decoding processing by the weighting coefficient, performing weighted decoding processing of said transmission data stream obtained by the MIMO decoding processing, wherein, when the transmitting-side precoding method is a limited feedback precoding method, the weighting calculation step on the receiving side comprises the steps of: performing channel estimation using reception signals received by the plurality of reception antennas; determining a precoding matrix in use of precoding processing on the transmitting side based on the channel estimate; and using the precoding matrix and the channel estimate to calculate a signal-to-noise ratio of the data stream as the weighting coefficient.