Tomlinson-Harashima Precoding with Imperfect Channel Side Information

In this paper, Tomlinson-Harashima precoding (THP) is studied for a scenario where the transmission system employs multiple transmit antenna and multiple users with single antenna at the receiver so that the cooperation among them is impossible (downlink scenario). Based on minimum mean square error (MMSE) criterion, a new robust solution is derived, which provides significant improvement with respect to conventional optimization method in imperfect channel side information (CSI) scenario. Spatial power loading is found to be important to the THP performance. We develop this loading for robust optimization of MMSE THP in minimum average symbol error rate (SER) sense. Simulation results are used to show the performance advantage attained by the robust optimization and the power loading in imperfect CSI scenario.

[1]  H.K. Bizaki,et al.  Power Loading by Minimizing the Average Symbol Error Rate on MIMO THP Systems , 2007, The 9th International Conference on Advanced Communication Technology.

[2]  Robert F. H. Fischer,et al.  Space-Time Transmission using Tomlinson-Harashima Precoding , 2002 .

[3]  Richard D. Wesel,et al.  Achievable Rates for Tomlinson-Harashima Precoding , 1998, IEEE Trans. Inf. Theory.

[4]  Gaston H. Gonnet,et al.  On the LambertW function , 1996, Adv. Comput. Math..

[5]  Robert F. H. Fischer,et al.  Precoding in multiantenna and multiuser communications , 2004, IEEE Transactions on Wireless Communications.

[6]  Jia Liu,et al.  Improved Tomlinson-Harashima precoding for the downlink of multiple antenna multi-user systems [mobile radio applications] , 2005, IEEE Wireless Communications and Networking Conference, 2005.

[7]  Dirk Dahlhaus,et al.  Optimal power adaptation for OFDM systems with ideal bit-interleaving and hard-decision decoding , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[8]  Abolfazl Falahati,et al.  Tomlinson-Harashima Precoding with Imperfect Channel Side Information , 2007 .

[9]  Huaiyu Dai,et al.  Joint Tomlinson-Harashima precoding and scheduling for multiuser MIMO with imperfect feedback , 2006, IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006..

[10]  Robert F. H. Fischer,et al.  Tomlinson-Harashima precoding in space-time transmission for low-rate backward channel , 2002, 2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599).

[11]  Robert F. H. Fischer,et al.  Precoding and loading for BLAST-like systems , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[12]  Wolfgang Utschick,et al.  Joint optimization of pilot assisted channel estimation and equalization applied to space-time decision feedback equalization , 2005, IEEE International Conference on Communications, 2005. ICC 2005. 2005.

[13]  M. J. Gans,et al.  On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas , 1998, Wirel. Pers. Commun..

[14]  Wolfgang Utschick,et al.  Robust Tomlinson-Harashima Precoding , 2005, 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications.

[15]  Ana I. Pérez-Neira,et al.  Robustness evaluation of uniform power allocation with antenna selection for spatial Tomlinson-Harashima precoding , 2005, Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005..

[16]  S. Kay.  Fundamentals of statistical signal processing: estimation theory , 1993 .