Massive MIMO with Low-Precision ADCs: A Performance Analysis
报告摘要：A challenge in the implementation of massive MIMO technology is the large amount of hardware needed to build the base stations–each of the hundreds of antennae has to be equipped with its own transceiver chain.The analogue-to digital converter (ADC) is one component of the base station, whose total complexity, cost and power consumption scale linearly with the number of antennae. This makes traditional ADCs, which commonly have more than 12 bits of precision, impractical in massive MIMO. One way to reduce the hardware complexity and power consumption of the receiver chain is to use ADCs with lower precision. Through an information-theoretic analysis of the effects of low precision ADCs, an achievable rate is derived that takes the resulting quantization of both the data and pilots used for channel estimation into account. The analysis shows that low-precision ADCs can be used to overcome the impracticality issue of the analogue-to-digital conversion in massive MIMO. ADCs with as low as 3-bit precision can be used without significant performance loss at spectral efficiencies around 3.5 bpcu per user, also under interference from stronger transmitters, with some imperfections in the automatic gain control,and with estimated channel state information. 报告人简介：Christopher Mollén received the degree of Ph.D. in 2018 from the Department of Electrical Engineering, Division for Communication Systems, at Linköping University, Sweden. Prior to his Ph.D. studies, he has worked as intern at Ericsson in Kista, Sweden, and in Shanghai, China. From 2011 to 2012, he studied at the Eidgenössische Technische Hochschule (ETH) Zürich, Switzerland, as an exchange student in the Erasmus Programme. From 2015 to 2016, he visited the University of Texas at Austin as a Fulbright Scholar. His research interest is lowcomplexity hardware implementations of massive MIMO base stations, including lowPAR precoding, low-resolution ADCs, and nonlinear amplifiers.
20180306Christopher Mollén How Distortion from Nonlinear Massive MIMO Transceivers is Radiated Spatially.mp4