Subarray-Processing Iterative SISO Multi-User Detection and Multi-Beam Directivity Control for Large-Scale Antenna Array in Quasi-Millimeter-Wave SDMA Systems

Masaaki FUJII  Ji-Yun SEOL  TaeYoung KIM  JaeWeon CHO  

IEICE TRANSACTIONS on Communications   Vol.E96-B    No.10    pp.2650-2660
Publication Date: 2013/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.2650
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
beamforming,  inter-beam interference,  inter-user interference,  iterative interference cancellation,  and phased array,  

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A subarray signal processing scheme is described for a large-scale two-dimensional analog-digital hybrid beamformer to be used in quasi-millimeter-wave-band mobile communication systems. Multiple analog phased arrays direct their respective beams to multiple users, enabling space-division multiple access (SDMA). An iterative soft-input soft-output (SISO) multi-user detector recovers multi-user signals from subarray output signals corrupted by inter-user interference (IUI). In addition, a phased-array directivity control algorithm is derived based on inter-subarray signal phase-difference estimation from inter-beam-interference (IBI)-cancelled subarray output signals. Simulation results demonstrate that our proposed scheme achieves reduced hardware complexity, IUI-resistant multi-user signal detection, and IBI-resistant multi-user-tracking phased-array directivity control.