A method of communicating data to a receiving antenna from N transmitting
antennas, where N is an integer, includes the steps of determining
whether a legacy transmission mode has been selected, producing N data
streams from outbound data, and applying the N data streams to a
space/time encoder to produce N encoded signals. When the legacy
transmission mode has not been selected, the N encoded signals are
transmitting from N transmitting antennas and when the legacy
transmission mode has been selected, the one encoded signal is
transmitted from one of the N transmitting antennas. The legacy
transmission mode allows receivers to receive and process transmitted
signals when the receivers are only configured to receive the transmitted
signals from a single transmitting antenna.