An Interference Alignment Scheme for 60 GHz Millimeter-Wave Communication System

60GHz millimeter wave communication systems usually use directional beamforming to compensate high propagation loss in this band. To fully exploit its potential of spatial reuse owing to directivity, an interference alignment scheme based on subarray partition is proposed in this paper. In this scheme, the whole antenna array is partitioned into M subarrays, where beamforming is performed within each subarray, and interference alignment is implemented among M subarray pairs. Simulation results have shown that the proposed scheme can further mitigate the interference on the basis of inner-subarray beamforming, and significantly improve the sum-capacity of the network in high transmit SNR region.