New Space Diversity Schemes with Feedback for Three Transmit Antennas

In this paper, new space diversity techniques are proposed for wireless communication systems with three transmit antennas. The first one is a code selection scheme in which all antennas are used, the other one is a hybrid scheme which consists of a combination of code and antenna selection schemes. In both schemes the precoding vector which maximizes diversity for current channel condition is selected with limited numbers of feedback bits. The scheme and the values of components of precoding vectors specify the numbers of precoding vectors and feedback bits. It is shown by computer simulations that the error performance is improved by increasing the number of feedback bits.