Performance of MMSE Receiver based Multi Input Multi Output-Interleave Division Multiple-Access System with Multi-user Detection over Frequency Selective Wireless Communication Channel

Abstract

<div align="justify"><b>Problem statement:</b> This study presents the performance analysis of turbo assisted Interleave&#13; Division Multiple-Access (IDMA) system with Multi Input Multi Output (MIMO) support for multi user&#13; scenario over correlated frequency selective and uncorrelated frequency selective channel. <b>Approach:</b>&#13; The key principle of IDMA is that interleaver unique which distinguishes the users in contrast to&#13; spreading sequence in Code Division Multiple Access System (CDMA). <b>Results:</b> In this work, we&#13; assume that Interleavers are generated independently and randomly. At the receiver, we employed&#13; Ordered SIC (OSIC) technique using ZF and MMSE criterion to combat Inter Antenna Interference (IAI)&#13; and Multi User Interference (MUI) problem along with iterative decoding to improve the performance in&#13; terms of BER. The performance of system has been discussed for different channel conditions with&#13; realistic channel model using extensive simulation runs based on Monte Carlo simulation trials. We have&#13; exhibited the flexibility and robustness provided by MIMO-IDMA. <b>Conclusion/Recommendations:</b> It&#13; has been proved from the results that IDMA principle can be applied to realize many potential&#13; performance gains highlighted by information theory, including coding gain multiplexing gain and multiuser&#13; gain. Simulation results presented to demonstrate the benefits of IDMA with MUD and iterative&#13; decoding. It is discerned that IDMA performs better than CDMA in frequency selective channel for high&#13; load conditions which is assessed through computer simulation results.</div