Precoding and feedback schemes for a MIMO backhaul link in the presence of interference

The focus of this paper is on the precoding and feedback strategies for a radio backhaul link between an access base station (ABS) and the hub base station (HBS) in the presence of mobile stations (MSs). In this paper it is assumed that the access and the backhaul links are simultaneous and use the same frequency band. Two feedback links are exploited at the ABS in order to optimize the communication through the radio-backhaul link: the MSs feed back the channel state information (CSI) of the channels between the ABS and the MSs, and the HBS feeds back the statistics of the received interference. Using this information, a transmission strategy is proposed for the ABS in order to transmit to the HBS without interfering to the MSs and at the same time minimizing the effect of the interference received at the HBS.