A Feedback Scheme for ZFBF-Based MIMO Broadcast Systems with Infrastructure Relay Stations

Zero-forcing beamforming (ZFBF) is a promising technique for multiuser MIMO systems. However, such method requires all the users to feed their channel information back to the base station (BS), so the BS can select the users and receive antennas as well as computing the transmit beamforming matrix. The quality of feedback information is crucial to the resultant system throughput. In order to reduce the power expenditure of the mobile stations (MS) while preserving the feedback quality, we propose a new feedback scheme based on the use of infrastructure relay stations (RS). The simulation results show that the scheme generally gives a better average throughput with lower SNR value requirements.

[1]  Guangxi Zhu,et al.  Downlink MIMO-OFDM system with adaptive resource allocation over Rayleigh fading space channel , 2005, International Conference on Space Information Technology.

[2]  Urbashi Mitra,et al.  Capacity Gain From Two-Transmitter and Two-Receiver Cooperation , 2007, IEEE Transactions on Information Theory.

[3]  Martin Haardt,et al.  Zero-forcing methods for downlink spatial multiplexing in multiuser MIMO channels , 2004, IEEE Transactions on Signal Processing.

[4]  Martin Haardt,et al.  A novel tree-based scheduling algorithm for the downlink of multi-user MIMO systems with ZF beamforming , 2005, Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005..

[5]  Y.-F. Huang,et al.  Feedback Constraints for Adaptive Transmission , 2007, IEEE Signal Processing Magazine.

[6]  Hui Liu,et al.  Infrastructure Relay Transmission With Cooperative MIMO , 2008, IEEE Transactions on Vehicular Technology.

[7]  Peiying Zhu,et al.  Multi-hop Relay System Evaluation Methodology (Channel Model and Performance Metric) , 2007 .

[8]  Urbashi Mitra,et al.  Capacity of ad-hoc networks with node cooperation , 2004, International Symposium onInformation Theory, 2004. ISIT 2004. Proceedings..

[9]  Halim Yanikomeroglu,et al.  Cooperative relaying in multi-antenna fixed relay networks , 2007, IEEE Transactions on Wireless Communications.

[10]  Ali H. Sayed,et al.  Active Antenna Selection in Multiuser MIMO Communications , 2007, IEEE Transactions on Signal Processing.

[11]  Andrea J. Goldsmith,et al.  On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming , 2006, IEEE Journal on Selected Areas in Communications.

[12]  Yih-Fang Huang,et al.  On the Feedback Transfer Effort for Rate-Adaptive Multiuser Systems , 2006, 2006 IEEE 63rd Vehicular Technology Conference.

[13]  Shidong Zhou,et al.  Receive antenna selection in the downlink of multiuser MIMO systems , 2005, VTC-2005-Fall. 2005 IEEE 62nd Vehicular Technology Conference, 2005..