Due to the requirement of establishing several independent links, multi-device multi-path beamforming (BF) training becomes rather time-consuming in 60-GHz millimeterwave communications. To reduce training overhead, a novel BF training scheme is proposed in this paper. The scheme includes a simultaneous training strategy for multiple devices and multiple paths, and a corresponding multi-path beam-pair detection algorithm. The training pilot of the source device is broadcasted to all destination devices. Subsequently, in each destination device, the proposed detection is separately conducted to detect significant-path-related beam pairs from the channel responses, via exploiting the time resolvability and space sparsity of physical paths. Finally, the training results are successively fed back to the source device. The proposed scheme achieves simultaneous training of multiple devices and multiple paths, and obtains significant reduction of overhead. Comprehensive simulations are presented to verify the effectiveness of this scheme.
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