Improved diversity on the uplink of multi-user MIMO systems

In this paper we analyse the performance of a MIMO receive algorithm that represents a modification of a precoding technique. Thereby we demonstrate the flexibility of these preceding techniques and investigate the possibility of applying the same algorithms at the base station (BS)/access point (AP) for both downlink (DL) and uplink (UL) MIMO processing. Unlike previously reported results where all users in the system are equipped with only one antenna, we investigate a more general case where users can be equipped with an arbitrary number of antennas. By combining one of the previously proposed precoding algorithm and space-time codes we are able to provide an SNR gain of more than 3 dB compared to V-BLAST

[1]  Vinko Erceg.  IEEE P802.11 Wireless LANs TGn Channel Models , 2004 .

[2]  Tung-Sang Ng,et al.  MIMO antenna system for multi-user multi-stream orthogonal space division multiplexing , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[3]  Emre Telatar,et al.  Capacity of Multi-antenna Gaussian Channels , 1999, Eur. Trans. Telecommun..

[4]  Martin Haardt,et al.  Linear MMSE Multi-User MIMO Downlink Precoding for Users with Multiple Antennas , 2006, 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications.

[5]  Andrea J. Goldsmith,et al.  On the capacity of multiple input multiple output broadcast channels , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[6]  Rohit U. Nabar,et al.  Introduction to Space-Time Wireless Communications , 2003 .

[7]  Reinaldo A. Valenzuela,et al.  V-BLAST: an architecture for realizing very high data rates over the rich-scattering wireless channel , 1998, 1998 URSI International Symposium on Signals, Systems, and Electronics. Conference Proceedings (Cat. No.98EX167).

[8]  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..

[9]  Anna Scaglione,et al.  Optimal designs for space-time linear precoders and decoders , 2002, IEEE Trans. Signal Process..

[10]  Martin Haardt,et al.  An introduction to the multi-user MIMO downlink , 2004, IEEE Communications Magazine.

[11]  A.J. Paulraj,et al.  Multiuser diversity for MIMO wireless systems with linear receivers , 2001, Conference Record of Thirty-Fifth Asilomar Conference on Signals, Systems and Computers (Cat.No.01CH37256).

[12]  Kai-Kit Wong.  Adaptive space-division-multiplexing and bit-and-power allocation in multiuser MIMO flat fading broadcast channels , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).