Interference Alignment Based Precoding Method for Reducing Bandwidth of the Backhaul Network

摘要

A method and a first radio node (110) for determining a first precoder to be used by the first radio node (110) for sending a transmission to a second radio node (120) are disclosed. The first radio node (110) measures (301) a set of cross-channel responses. The first radio node (110) encodes (302) the set of cross-channel responses into a first code-book index using a quantization scheme. The first radio node (110) sends (303) the first code-book index to a central unit (150). The first radio node (110) receives (307) a second code-book index from the central unit (150). The first radio node (110) obtains a second precoder (308) by decoding the second code-book index. The first radio node (110) determines (309) the first precoder by compensating the second precoder while taking the quantization scheme and the co-operative interference mitigation scheme into account. The first radio node (110) applies (310) the first precoder to the transmission, to be sent by the first radio node (110), to the second radio node (120).