Patent ID: 8989131
Filing Date: 2015-03-24
Classification: H04B,H04W

Abstract:
1. A method for transmitting information in a multi-user (MU)-MIMO wireless communication system having a multi-antenna transmitter and L user terminals, the method comprising: scheduling a trio of user packets for a round-2 transmission to form one transmission session using outdated channel state information at the transmitter (CSIT), the trio of user packets including a first packet destined for a first user terminal of the L user terminals, a second packet destined for a second user terminal of the L user terminals, and a third packet destined for a third terminal of the L user terminals, based on knowledge of user channels from transmissions to some or all L user terminals and based on a utility function; combining eavesdropped observations from three of a plurality of round-1 transmissions, the eavesdropped observations including information indicative of round-1 eavesdropped channels fed back from the first, second and third user terminals; and transmitting the combined observations of the trio of user packets as part of the round-2 transmission, wherein a first message and a second message of the round-2 transmission include the first packet and the second packet, a third message and a fourth message of the round-2 transmission include the first packet and the third packet, a fifth message of the round-2 transmission includes the second packet and a fourth packet destined for a fourth user terminal of the L user terminals, and a sixth message of the round-2 transmission includes the third packet and a fifth packet destined for a fifth user terminal of the L user terminals.