A Rake-Finger Based Efficient Channel State Information Feedback Compression Scheme for the MIMO OFDM FDD Downlink

An efficient feedback compression scheme is presented for signaling of explicit channel state information (CSI) to the transmitter side for MIMO OFDM systems in general and especially with coordinated multi-point transmission (COMP). Simulation results show that the required rates can be reduced by a factor of up to 17, compared to reporting of quantized frequency domain channel representations. This is achieved by using a separation of short-term and long-term information and a time-domain representation reduced to 'rake-fingers' for removing redundancy and irrelevant information. This novel proposed solution can be used as an important enabler for coherent network MIMO in the FDD downlink.

[1]  Thorsten Wild.  Successive user insertion for long-term adaptive beams with SDMA using short-term CQI , 2007 .

[2]  Carl D. Meyer,et al.  Matrix Analysis and Applied Linear Algebra , 2000 .

[3]  Federico Boccardi,et al.  A Near-Optimum Technique using Linear Precoding for the MIMO Broadcast Channel , 2007, 2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07.

[4]  Ari Hottinen,et al.  Increasing downlink cellular throughput with limited network MIMO coordination , 2009, IEEE Transactions on Wireless Communications.

[5]  Gregory E. Bottomley,et al.  Rake receiver finger placement for realistic channels , 2004, 2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733).

[6]  C. Brunner,et al.  On space-time RAKE receiver structures for WCDMA , 1999, Conference Record of the Thirty-Third Asilomar Conference on Signals, Systems, and Computers (Cat. No.CH37020).

[7]  J. Salo,et al.  An interim channel model for beyond-3G systems: extending the 3GPP spatial channel model (SCM) , 2005, 2005 IEEE 61st Vehicular Technology Conference.