3D beamforming effect for backhaul link in time-division relaying

Three-dimensional (3D) beamforming, which operates in both azimuth and elevation antenna domains, is a key technique to increase the signal-to-interference plus noise ratio of a receiver. This technique can also suppress the spatial interference in a cell. This paper proposes the application of 3D beamforming to a backhaul link in time-division relaying. We investigate the 3D beamforming effect in comparison to conventional backhaul link. Average and 5-percentile user throughput are described as parameters of almost blank subframe (ABS) ratio in time-division relaying using system-level simulation. It is confirmed that the proposed method can improve both average and 5-percentile user throughput. Further, an ABS ratio of around 3/10 provides the best performance.

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