Multiuser Detection Using Hybrid ARQ with Incremental Redundancy in Overloaded MIMO Systems (Workshop Paper)

Multiple Input and Multiple Output (MIMO) systems use multiple antennas at both transmitter and receiver ends for increasing link capacity and spectral efficiency. However, combining schemes used for such systems face critical issues such as presence of interference, signals to interference and noise ratios (SINRs) and complexity. To overcome the asserted issues; in this paper linear multiuser detection techniques are employed in over loaded MIMO systems where the number of transmit antennas ($$\varvecN_t$$) is greater than number of receiver antennas ($$\varvecN_r$$), using Hybrid Automatic Repeat request with Incremental Redundancy (HARQ IR). The primary aim of this research is to enhance bit error rate (BER) and throughput by transforming an overloaded MIMO systems ($$\varvecN_t>N_r$$) into critically loaded system ($$\varvecN_t=N_r$$) or under loaded MIMO systems ($$\varvecN_t<N_r$$) by simple retransmission method. Simulation results show unprecedented performance compared to contemporary approaches in term of throughput and BER.