Evaluation and modeling of microprocessors’ numerical precision impact on 5G Enhanced Mobile Broadband Communications

Resumen

Future 5G systems are envisioned to provide enhanced mobile broadband communications (eMBBC) service with bitrates in the order of 10Gbps. To support these large bitrates, the proposed schemes employ orthogonal frequency division multiplexing (OFDM) techniques to improve the spectral efficiency. These OFDM technologies are based on the calculation of Fast Fourier Transforms (FFT), whose result quality determines the orthogonal properties of the entire system. A low quality FFT calculation increases the spectral interferences and reduces the physical channel capacity, apart from the usual effects of numerical noise. Then, certain applications such as IoT solutions, where resource constrained devices with limited numerical precision are common, may experiment problems and practical limitations to be provided with eMBBC. It is essential to perform a scientific analysis of this situation to enrich and improve the future 5G standards. Therefore, in this paper we study from a theorical and simulation point of view the effective physical bitrate in 5G eMBBC scenarios including devices with limited numerical precision. We present a mathematical model considering both effects, the electromagnetic interferences and the numerical noise, and different numerical simulations analyzing relevant situations. As a conclusion, we present recommendations for future standards.