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　is　greater　than　number　of　receiver　antennas　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　into　critically　loaded　system　or　under　loaded　MIMO　systems　by　simple　retransmission　method.　Simulation　results　show　unprecedented　performance　compared　to　contemporary　approaches　in　term　of　throughput　and　BER.　©　2019,　ICST　Institute　for　Computer　Sciences,　Social　Informatics　and　Telecommunications　Engineering.