FIR channel-shortening equalizers for MIMO ISI channels

Finite-length delay-optimized multi-input multi-output (MIMO) equalizers that optimally shorten the impulse response memory of frequency-selective MIMO channels are derived. The MIMO equalizers are designed to minimize the average energy of the error sequence between the equalized MIMO channel impulse response and an MIMO target impulse response (TIR) with shorter memory. Two criteria for optimizing the MIMO TIR are analyzed and compared. The presented analytical framework encompasses a multitude of previously-studied finite-length equalization techniques.

[1]  John M. Cioffi,et al.  Spatio-temporal coding for wireless communication , 1998, IEEE Trans. Commun..

[2]  N. Al-Dhahir,et al.  Efficiently computed reduced-parameter input-aided MMSE equalizers for ML detection: a unified approach , 1996, IEEE Trans. Inf. Theory.

[3]  H. Akaike.  Block Toeplitz Matrix Inversion , 1973 .

[4]  Gerhard Bauch,et al.  MAP equalization of space-time coded signals over frequency selective channels , 1999, WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466).

[5]  A.H. Sayed,et al.  A computationally-efficient FIR MMSE-DFE for multi-user communications , 1999, Conference Record of the Thirty-Third Asilomar Conference on Signals, Systems, and Computers (Cat. No.CH37020).

[6]  Boon Chong Ng,et al.  Space-time modems for wireless personal communications , 1998, IEEE Wirel. Commun..

[7]  Suhas Diggavi,et al.  Performance of multisensor adaptive MLSE in fading channels , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

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

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

[10]  James W. Modestino,et al.  Integrated multielement receiver structures for spatially distributed interference channels , 1986, IEEE Trans. Inf. Theory.

[11]  G. Bauch,et al.  Iterative equalization and decoding with channel shortening filters for space-time coded modulation , 2000, Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152).

[12]  Asrar U. H. Sheikh,et al.  Adaptive equalization and diversity combining for mobile radio using interpolated channel estimates , 1991 .

[13]  Gregory E. Bottomley,et al.  Adaptive arrays and MLSE equalization , 1995, 1995 IEEE 45th Vehicular Technology Conference. Countdown to the Wireless Twenty-First Century.

[14]  A. Sendyk,et al.  Diversity combining with MLSE equalisation , 1998 .

[15]  Vasant K. Prabhu,et al.  Optimum diversity combining with finite-tap decision feedback equalization in digital cellular mobile radio , 1997, Proceedings of ICC'97 - International Conference on Communications.