Preprint Article Version 1 This version is not peer-reviewed

On Massive MIMO for Low Power Wide Area Networks

Version 1 : Received: 1 November 2019 / Approved: 3 November 2019 / Online: 3 November 2019 (16:06:01 CET)

How to cite: Pereira de Figueiredo, F.A.; Ferreira Dias, C.; moerman, I.; Rodrigues de Lima, E.; Fraidenraich, G. On Massive MIMO for Low Power Wide Area Networks. Preprints 2019, 2019110021 (doi: 10.20944/preprints201911.0021.v1). Pereira de Figueiredo, F.A.; Ferreira Dias, C.; moerman, I.; Rodrigues de Lima, E.; Fraidenraich, G. On Massive MIMO for Low Power Wide Area Networks. Preprints 2019, 2019110021 (doi: 10.20944/preprints201911.0021.v1).

Abstract

The use of large-scale antenna arrays grants considerable benefits in energy and spectral efficiency to wireless systems due to spatial resolution and array gain techniques. By assuming a dominant line-of-sight environment in a massive MIMO scenario with favorable propagation, we derive analytical expressions for the sum-capacity. % Then, we show that convenient simplifications on the sum-capacity expressions are possible when working at low and high SNR regimes. % Furthermore, in the case of a high SNR regime, it is demonstrated that the Gamma PDF can approximate the PDF of the instantaneous channel sum-capacity as the number of BS antennas grows. A second important demonstration presented in this work is that a Gamma PDF can also be used to approximate the PDF of the summation of the channel's singular values as the number of devices increases. Finally, it is important to highlight that the presented framework is useful for LPWAN's as we show that the transmit power of each device can be made inversely proportional to the number of BS antennas.

Subject Areas

massive MIMO, LPWAN, channel capacity, outage probability.

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