HYBRID TRANSMIT DIVERSITY

摘要

An approach to hybrid transmit diversity which involves the transmission of information using different forms of transmit diversity for at least two adjacent time slots is disclosed. A base station transmits information using a first transmit diversity technique during a first time slot and then using a second transmit diversity technique in an adjacent time slot, such as the next subsequent time slot. Thus, a base station may transmit information to mobile terminal X using delay diversity during one time slot and then transmit information to mobile terminal Y using space-time diversity during the next time slot. This approach may also be used to transmit the GSM the FCCH with combined delay diversity and antenna hopping diversity (actual or virtual) while other GSM channels are transmitted with just delay diversity. Methods are also disclosed for accommodating the change in diversity techniques between the time slots that involve either transmitting dummy symbol(s) as part of the data field or stealing symbol(s) from the sync field to use in the data field.