Patent ID: 7515644
Filing Date: 2009-04-07
Classification: H04L

Abstract:
1. A transmitter with three transmit antennas in a communication system using a space-time-frequency block coding scheme, comprising: a pre-coder for pre-coding a symbol vector of an input symbol sequence by multiplying the symbol vector by e a space-time-frequency block code (STFBC) mapper for selecting an STFBC based on feedback channel quality indicators (CQIs) received from a receiver, mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas; wherein the STFBC mapper selects the STFBC based on the feedback CQIs according to, where CQI_ant 1 , CQI_ant 2 , and CQI_ant 3 represent CQIs for first, second and third transmit antennas, respectively, select max is a function for selecting a maximum value, and the matrices A, B and C are given as where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier.