The performance of an uplink Massive MIMO OFDM-based multiuser system with LDPC coding when using relays

Abstract

As our dependency on mobile Internet and mobile phones is increasingly more obvious, the resources of the implemented systems need to support it. In order to achieve that, the fifth generation (5G) standard and future wireless networks are now the main point of interest that can cope with the explosive demand on data traffic, considering the new or the existing technologies that must be reviewed or improved. One is the technology where multiple antennas are used at the receiver/transmitter ends (MIMO) which evolved to Massive MIMO, but with a much higher number of antennas. Another one is the orthogonal frequency-division multiplexing (OFDM) modulation technique that brings its benefits by reducing the inter-symbol and intra-symbol interference. Low-density paritycheck (LDPC) codes have capacity-approaching advantage and relatively low and scalable decoding complexity. Cooperative relaying manages the difficult problem of ensuring coverage and capacity at the cell border and it is cost effective. Therefore, in this paper is proposed a Massive multiuser MIMO system with OFDM and LPDC coding when using non-regenerative relays. Further, we are interested in the quality of the information that reaches the base station, considering that only spatial diversity gain is employed, by implementing a minimum mean-square error (MMSE) detector in combination with successive interference cancelation (SIC).