1-Bit Massive MIMO Transmission: Embracing Interference with Symbol-Level Precoding

The deployment of large-scale antenna arrays for cellular base stations (BSs), called massive MIMO, has been a key enabler meeting the ever increasing capacity requirement 5G communication systems and beyond. Despite their promising performance, fully digital MIMO require large number hardware components including radio frequency chains, power amplifiers, digital-to-analog converters (DACs), so on, resulting in huge increase terms total consumption costs BSs. Toward both spectrally-efficient energy-efficient deployment, limited architectures have proposed, hybrid analog-digital structures, constant-envelope transmission, use low-resolution DACs. In this article, we overview recent advances improving error rate performance with 1-bit DACs through precoding at symbol level. This line research goes beyond traditional interference suppression or cancellation techniques by managing on symbol-by-symbol basis. provides unique opportunities interference-aware tailored practical systems. first explain concept constructive (CI) elaborate how CI can benefit signal design exploiting traditionally undesired multi-user as well from imperfect components. We then several solutions to illustrate gains achievable CI. Finally, identify some challenges future directions that yet be explored.