COMBINED OPEN/CLOSED LOOP TRANSMIT DIVERSITY SYSTEM, PARTICULARLY CONCERNED WITH WIRELESSLY TRANSMITTING A SIGNAL TO A RECEIVER STATION BY THE TRANSMIT DIVERSITY SYSTEM HAVING AT LEAST FOUR ANTENNAS

摘要

PURPOSE: A combined open/closed loop transmit diversity system is provided to transmit a wireless signal to a receiver station by comprising at least four antennas arrayed in groups, thereby obtaining an excellent radio link performance gain which is almost independent of a receiver station speed. CONSTITUTION: An antenna unit includes at least two antenna groups(SA1-SAN), and wherein each group(SA1-SAN) includes at least two antennas(A1-AN). A receiver receives feedback information(W) from a receiver station by using a feedback channel. A controller controls a phase and/or an amplitude of a signal transmitted by the antenna unit based on the feedback information. An open-loop transmit diversity encoder(ENC) encodes a signal(SS) to be transmitted to the receiver station by all the antenna groups(SA1-SAN).