WIRELESS COMMUNICATION SYSTEM AND METHOD USING STOCHASTIC SPACE-TIME/FREQUENCY DIVISION MULTIPLEXING

摘要

A method and apparatus for wireless transmission of a digital bit stream (102). The method employs diversity techniques to minimize multipath fading. Digital bits are converted into symbols (S1 to Sn) and the symbols are provided to a number of diversity branches (109). Each diversity branch has its own antenna (114). The symbols sent to each diversity branch may be multiplied by a different phase factor or amplitude factor. The phase factors and the amplitude factors may be randomly selected. Channel quality measurements are used to select the phase and amplitude factors. The symbols can be grouped into frames before transmission. The frames can be multiplied by matrices comprising phase and amplitude factors. The frames can undergo cyclic shifting, which provides an additional measure of diversity.