Beamforming Matrix Transformation for Random Beamforming

The signal to interference plus noise ratio (SINR) feedback has been utilized in random beamforming (RBF) to select users for the provision of service in multiple-input multiple-output (MIMO) systems. A large number of users are required to obtain the gain of multi-user diversity for a downlink transmission. However, if the number is not large enough, it may be difficult to obtain multi-user diversity, leading to a rapid degradation in performance. To resolve this problem, it is necessary to find beamforming matrix close to the channels of the selected users. In this paper, a beamforming matrix transformation for RBF (BMT-RBF) is presented, demonstrating an efficient search of random beams correlated with user channels as opposed to conventional ones, over a small number of users.

[1]  Farooq Khan.  LTE for 4G Mobile Broadband: LTE for 4G Mobile Broadband , 2009 .

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

[3]  Jeffrey G. Andrews,et al.  Performance of Orthogonal Beamforming for SDMA With Limited Feedback , 2006, IEEE Transactions on Vehicular Technology.

[4]  Chan-Soo Hwang,et al.  A random beamforming technique in MIMO systems exploiting multiuser diversity , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[5]  Babak Hassibi,et al.  On the capacity of MIMO broadcast channels with partial side information , 2005, IEEE Transactions on Information Theory.

[6]  Babak Hassibi,et al.  A Comparison of Time-Sharing, DPC, and Beamforming for MIMO Broadcast Channels With Many Users , 2007, IEEE Transactions on Communications.

[7]  Stefania Sesia,et al.  LTE - The UMTS Long Term Evolution , 2009 .

[8]  Ana I. Pérez-Neira,et al.  Mean vs. variance trade-off analysis in multi-antenna multi-user channels , 2006, IEEE Transactions on Wireless Communications.

[9]  Umberto Spagnolini,et al.  Beam Selection Strategies for Orthogonal Random Beamforming in Sparse Networks , 2008, IEEE Transactions on Wireless Communications.

[10]  Erik Dahlman,et al.  3G Evolution: HSPA and LTE for Mobile Broadband , 2007 .

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

[12]  Babak Hassibi,et al.  On the capacity of MIMO broadcast channel with partial side information , 2003, The Thrity-Seventh Asilomar Conference on Signals, Systems & Computers, 2003.

[13]  David James Love,et al.  On the performance of random vector quantization limited feedback beamforming in a MISO system , 2007, IEEE Transactions on Wireless Communications.