Methods for wireless differential communication using multiple transmitter antennas

摘要

The method of differential communication for multiple transmitter antennas generalizes conventional coding of information in the phase shift between successive complex scalars signals used in single antenna communication to signals that are complex matrices. Each column of such a matrix represents a time sequence of signals emitted by a respective antenna of a multiple transmitter array. Preferably, the signal matrices are unitary matrices that form at least part of a finite group under multiplication. Data is encoded by making each transmitted signal the product of the previous signal and a selected one of the signal matrices. <IMAGE>