摘要
Enhanced mobile broadband(e MBB) is one of the key use-cases for the development of the new standard 5G New Radio for thenext generation of mobile wireless networks. Large-scale antenna arrays, a.k.a. massive multiple-input multiple-output(MIMO), theusage of carrier frequencies in the range 10-100 GHz, the so-called millimeter wave(mm-Wave) band, and the network densifica-tion with the introduction of small-sized cells are the three technologies that will permit implementing e MBB services and realiz-ing the Gbit/s mobile wireless experience. This paper is focused on the massive MIMO technology. Initially conceived for conven-tional cellular frequencies in the sub-6 GHz range(μ-Wave), the massive MIMO concept has been then progressively extended tothe case in which mm-Wave frequencies are used. However, due to different propagation mechanisms in urban scenarios, the re-sulting MIMO channel models at μ-Wave and mm-Wave are radically different. Six key basic differences are pinpointed in thispaper, along with the implications that they have on the architecture and algorithms of the communication transceivers and on theattainable performance in terms of reliability and multiplexing capabilities.
Enhanced mobile broadband(e MBB) is one of the key use-cases for the development of the new standard 5G New Radio for thenext generation of mobile wireless networks. Large-scale antenna arrays, a.k.a. massive multiple-input multiple-output(MIMO), theusage of carrier frequencies in the range 10-100 GHz, the so-called millimeter wave(mm-Wave) band, and the network densifica-tion with the introduction of small-sized cells are the three technologies that will permit implementing e MBB services and realiz-ing the Gbit/s mobile wireless experience. This paper is focused on the massive MIMO technology. Initially conceived for conven-tional cellular frequencies in the sub-6 GHz range(μ-Wave), the massive MIMO concept has been then progressively extended tothe case in which mm-Wave frequencies are used. However, due to different propagation mechanisms in urban scenarios, the re-sulting MIMO channel models at μ-Wave and mm-Wave are radically different. Six key basic differences are pinpointed in thispaper, along with the implications that they have on the architecture and algorithms of the communication transceivers and on theattainable performance in terms of reliability and multiplexing capabilities.
