Bit-Metric Decoding Rate in Multi-User MIMO Systems: Theory

Link-adaptation (LA) is one of the most important aspects wireless communications where modulation and coding scheme (MCS) used by transmitter adapted to channel conditions in order meet a certain target error-rate. In single-user SISO (SU-SISO) system with out-of-cell interference, LA performed computing post-equalization signal-to-interference-noise ratio (SINR) at receiver. The same technique can be employed multi-user MIMO (MU-MIMO) receivers that use linear detectors. Another SINR for physical layer (PHY) abstraction, several PHY blocks like encoder, detector, decoder are replaced an abstraction model speed up system-level simulations. However, MU-MIMO systems non-linear receivers, there no known equivalent which makes both extremely challenging. This issue addressed this two-part paper. part, metric called bit-metric decoding rate (BMDR) proposed SINR, presented. Since BMDR does not have closed form expression would enable its instantaneous calculation, machine-learning approach predict it presented along extensive simulation results.