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This paper presents a novel data detector ASIC for massive multiusermultiple-input multiple-output (MU-MIMO) wireless systems. The ASIC implementsa modified version of the large-MIMO approximate message passing algorithm(LAMA), which achieves near-optimal error-rate performance (i) under realisticchannel conditions and (ii) for systems with as many users as base-station (BS)antennas. The hardware architecture supports 32 users transmitting 256-QAMsimultaneously and in the same time-frequency resource, and provides soft-inputsoft-output capabilities for iterative detection and decoding. The fabricated28nm CMOS ASIC occupies 0.37mm^2 , achieves a throughput of 354Mb/s, consumes151mW, and improves the SNR by more than 11dB compared to existing datadetectors in systems with 32 BS antennas and 32 users for realistic channels.In addition, the ASIC achieves 4x higher throughput per area compared to arecently proposed message-passing detector.

A 354Mb/s 0.37mm^2 151mW 32-User 256-QAM Near-MAP Soft-Input Soft-Output Massive MU-MIMO Data Detector in 28nm CMOS