A novel CQI feedback and user allocation scheme for PU2RC/OFDMA systems in correlated MIMO channels

  • Authors:
  • Myeon-gyun Cho

  • Affiliations:
  • Dept. of Information and Communication, Semyung University, Jeachon, Korea

  • Venue:
  • WTS'10 Proceedings of the 9th conference on Wireless telecommunications symposium
  • Year:
  • 2010

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Abstract

On the multi-antenna broadcast channel, Space division multiple access (SDMA) extracts the multiplexing gain by transmitting multiuser packets simultaneously to maximize the system throughput. This paper considers a practical design called per user unitary and rate control (PU2RC) in order to achieve the multi-user diversity (MUDiv) for SDMA with the reasonable feedback burden. However, PU2RC/OFDMA needs to feedback the preferred precoding index and its CQIs per resource unit, chunk. Moreover, it has a defect in scheduling the streams using user grouping and is difficult to achieve MUDiv fully. In order to overcome these drawbacks, we employ transmitter controlled precoding and opportunistic feedback (TCP-OFB) in conjunction witb frequency scheduling for single-user and multi-user allocation. Numerical results shows that the proposed scheme achieves comparable performance to conventional PU2RC/OFDMA with a far reduced feedback load in any user allocation and antenna correlation scenarios.