期刊名称：International Journal of Computer Science and Network Security
印刷版ISSN：1738-7906
出版年度：2018
卷号：18
期号：10
页码：43-51
出版社：International Journal of Computer Science and Network Security
摘要：In wireless communication systems, multiple input multiple output (MIMO) and orthogonal frequency division multiplexing (OFDM) technologies offer reliable communication with high capacity and coverage rate. In a multiuser MIMO systems, co-channel interference increases drastically when a large number of users are added to the channel. However, it is practically not feasible to provide a separate physical receive antenna to each user, which leads the system into an overloaded condition. Although, the optimal and suboptimal multiuser detection (MUD) algorithms perform better in MIMO system but these algorithms perform poorly in an overloaded MIMO system(N_Rx N_Tx )system. In addition, we introduce a selective retransmission (SR) scheme for the retransmission of erroneous OFDM subcarriers at modulation level. The SR scheme increases the throughput by reducing HARQ retransmissions. Simulation results validate the performance of our proposed scheme in terms of throughput enhancement with reduced bit error rate (BER) and packet drop rate.
