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

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Document pages: 7 pages

Abstract: The deployment of large-scale antenna arrays for cellular base stations(BSs), termed as `Massive MIMO , has been a key enabler for meeting theever-increasing capacity requirement for 5G communication systems and beyond.Despite their promising performance, fully-digital massive MIMO systems requirea vast amount of hardware components including radio frequency chains, poweramplifiers, digital-to-analog converters (DACs), etc., resulting in a hugeincrease in terms of the total power consumption and hardware costs forcellular BSs. Towards both spectrally-efficient and energy-efficient massiveMIMO deployment, a number of hardware limited architectures have been proposed,including hybrid analog-digital structures, constant-envelope transmission, anduse of low-resolution DACs. In this paper, we overview the recent interest inimproving the error-rate performance of massive MIMO systems deployed with1-bit DACs through precoding at the symbol level. This line of research goesbeyond traditional interference suppression or cancellation techniques bymanaging interference on a symbol-by-symbol basis. This provides uniqueopportunities for interference-aware precoding tailored for practical massiveMIMO systems. Firstly, we characterize constructive interference (CI) andelaborate on how CI can benefit the 1-bit signal design by exploiting thetraditionally undesired multi-user interference as well as the interferencefrom imperfect hardware components. Subsequently, we overview several solutionsfor 1-bit signal design to illustrate the gains achievable by exploiting CI.Finally, we identify some challenges and future research directions for 1-bitmassive MIMO systems that are yet to be explored.

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